SEPARATOR AND PROCESS FOR SEPARATING VOLATILE COMPOUNDS FROM A POLYMER SOLUTION

The present invention is concerned with a separator comprising a vessel, a first inlet, a second inlet, a first outlet, a second outlet, and a separation device located downstream of the first outlet, wherein the separation device comprises two outlets, whereas one outlet of the separation device is fluidly connected to the second inlet of the vessel. Furthermore, the present invention is also concerned with a process for separating hydrocarbons from a reaction solution comprising a polymer and said hydrocarbons, comprising the steps of passing the reaction solution through the first inlet into the separator according to the invention, withdrawing a first outlet stream through the first outlet, withdrawing a second outlet stream through the second outlet, separating the first outlet stream in the separation device to produce a first separated stream and a second separated stream, withdrawing the first separated stream from the separation device and passing the first separated stream through the second inlet into the vessel, and withdrawing the second separated stream from the separation device. 1. A separator comprising{'b': '1', 'a. a vessel (),'}{'b': '2', 'b. a first inlet (),'}{'b': '4', 'c. a second inlet (),'}{'b': '5', 'd. a first outlet (),'}{'b': '6', 'e. a second outlet (), and'}{'b': 8', '5, 'f. a separation device () located downstream of the first outlet (),'}{'b': 8', '8', '4', '1, 'wherein the separation device () comprises two outlets, whereas one outlet of the separation device () is fluidly connected to the second inlet () of the vessel ().'}27518. The separator according to further comprising a pump () located between the first outlet () of the vessel () and the separation device ().310541. The separator according to further comprising a recycling heater () located downstream of the first outlet () and upstream of the second inlet () of the vessel ().410841. The separator according to claim 3 , wherein the recycling heater () is located downstream ...

Process for obtaining low volatile plastomers

Process for reducing the volatile organic compound content of plastomer having a density of equal to or lower than 883 kg/m3 and—a MFR2 of 100.0 g/l 0 min or lower (ISO 1133 at 2.16 kg load and 190° C.); to below 65 ppm(VOC, VDA277), the process comprising the steps of a) providing raw plastomer in granular form, the raw plastomer having a density of equal to or lower than 883 kg/m3; and a MFR2 of 100.0 g/10 min or lower (ISO 1133 at 2.16 kg load and 190° C.); and a volatile organic compound content (VOC, VDA277) of above 150 ppm, and the granules having an average D50 diameter of 2.5 to 4.5 mm b) subjecting said granular raw plastomer to at least one intensive hydrodynamic regime at a minimum temperature of at least 20° C. and a maximum temperature of 4° C. below the Vicat temperature (10 N, ISO 306) of the granular raw plastomer or 35° C., whatever value is lower, with the temperature measured at the gas inlet to the fast-fluidization regime, c) recovering the granular plastomer.

A SEPARATING DEVICE FOR SEPARATING VOLATILE COMPOUNDS FROM A POLYMER REACTION MIXTURE

The current application is related to a separating device for separating volatile compounds from a polymer reaction mixture comprising a gravimetric separator, having a gravimetric vessel, an inlet for feeding the polymer reaction mixture, a first outlet located in the lower part of the gravimetric vessel for withdrawing a first polymer-rich stream, and a second outlet located in the upper part of the gravimetric vessel for withdrawing a first polymer-lean stream; and a flash separator having a flash vessel, a first inlet for feeding a second polymer-lean stream split from the first polymer-lean stream, a first outlet located at the lower part of the flash vessel for withdrawing a liquid stream, and a second outlet located at the upper part of the flash vessel for withdrawing a gaseous stream, wherein the second outlet of the separator vessel is fluidly connected to the first inlet of the flash vessel. Furthermore, the present application is related to a A process for separating volatile compounds from a reaction mixture comprising a polymer and said volatile compounds, comprising the steps of passing the reaction mixture through the inlet into the gravimetric vessel of the gravimetric separator of a separating device according to the present invention, withdrawing a first polymer-rich stream comprising mainly polymer through the first outlet of the gravimetric vessel, withdrawing a first polymer-lean stream comprising mainly volatile compounds through the second outlet of the gravimetric vessel, passing at least a part of the polymer-lean stream as a second polymer-lean stream through the first inlet into the flash vessel of the flash separator of the separating device according to the present invention, withdrawing a liquid stream through the first outlet of the flash vessel, and withdrawing a gaseous stream through the second outlet of the flash vessel. 2518191031185. The separating device according to claim 1 , wherein the flash vessel () further comprises a ...

Process for obtaining low volatile plastomers

A process for reducing the volatile organic compound content of granular plastomers having a density of equal to or lower than 883 kg/m3 and a MFR2 of 100.0 g/10 min or lower (ISO 1133 at 2.16 kg load and 190° C.), to below 65 ppm (VOC, VDA277), the process comprising the steps of providing a granular raw plastomer in a treatment vessel, the granular raw plastomer having a density of equal to or lower than 883 kg/m3, and a MFR2 of 100.0 g/10 min or lower (ISO 1133 at 2.16 kg load and 190° C.), and a volatile organic compound content (VOC, VDA277) of above 150 ppm, subjecting said granular raw plastomer to a gasflow within the range of 30 m3/(h t) to 150 m3/(h t) for an aeration time of less than 96 hours, whereby the gas has a minimum temperature of at least 26° C. measured at a gas inlet of the treatment vessel and a maximum temperature of 4° C. below the Vicat temperature (10 N, ISO 306) of the granular raw plastomer or 35° C. measured at the gas inlet of the treatment vessel, whatever value is lower; and recovering the granular plastomer.

PROCESS FOR REMOVING VOLATILE COMPONENTS FROM AN OLEFIN POLYMER AND ARTICLE OBTAINED

The invention relates to a process for removal of volatile components from an olefin polymer, the process carried out in an extruder comprising at least one vacuum degassing zone, said process comprising the steps of: (a) introducing a stream of an olefin polymer into the extruder; (b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components, wherein the process in the extruder has a residence time distribution broadness (σ2) in the range of 800 to 4000 as define by equation (1) wherein: σ2 is the residence time distribution broadness, T is the mean residence time, t is the interval of residence time a fluid element of the olefin polymer spends in the extruder, E(t) is the residence time distribution function, and wherein the process optionally comprises a step (c) where the melt of the olefin polymer is passed through a die zone to a pelletizer for pelletizing the obtained olefin polymer. 1. A process for removal of volatile components from an olefin polymer , the process carried out in an extruder comprising at least one vacuum degassing zone , said process comprising the steps of:(a) introducing a stream of an olefin polymer into the extruder;(b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components,{'sup': '2', 'claim-text': {'br': None, 'sup': 2', '∞', '2, 'sub': '0', 'i': t', 'E', 't', 'dt, 'σ=∫(−τ)()\u2003\u2003equation (1)'}, 'wherein the process in the extruder has a residence time distribution broadness (σ) in the range of 800 to 4000 as define by equation 1'}wherein:σ2 is the residence time distribution ...

A METHOD OF REDUCING THE ENTRAINMENT OF POLYMER IN THE POLYMER-LEAN LIQUID PHASE OF A SEPARATOR

The present invention relates to a method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator, comprising the steps of: (i) Selecting the diameter of the polymer droplets in the polymer solution entering the separator; (ii) Determining the traveling time of the polymer droplets in the separator; and (iii) Adjusting the residence time of the polymer-dense phase in the separator to be at least the traveling time of the polymer droplets, a solution polymerization process using said method for reducing the entrainment of polymer in the polymer-lean liquid phase in the separator and the use of said method for determining the minimum residence time of the polymer solution in the separator required to ensure efficient separation of a polymer solution into a polymer-lean phase and a polymer-rich phase. 1. A method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator , comprising the steps of:(i) Setting the diameter range of the polymer droplets in the polymer solution entering the separator;(ii) Estimating the traveling time of the polymer droplets in the separator; and(iii) Adjusting the residence time of the polymer solution in the separator to be at least the traveling time of the polymer droplets in the lean-phase.2. The method according to claim 1 , wherein the diameter range of the polymer droplets is set by selecting the hole size of the distributor inside the separator.3. The method according to claim 1 , wherein the diameter of the polymer droplets is at least 50 μm claim 1 , preferably at least 75 μm claim 1 , most preferably at least 100 μm and usually not more than 1000 μm.4. The method according to claim 1 , wherein the traveling time is estimated from termination velocity of the polymer droplets.6. The method according to claim 4 , wherein the termination velocity uis at least 0.001 m/s claim 4 , preferably 0.005 m/s and most preferably at least 0.01 m/s and usually not higher than 1.5 m/s.7 ...

METHOD OF RECOVERING OLEFINS IN A SOLUTION POLYMERISATION PROCESS

The present invention relates to a process for removing hydrocarbons comprising the steps of: 2. The process according to wherein the stream of the solution comprises 1-hexene and n-octane and a mixture of isomers of 1-hexene and n-hexane.3. The process according to comprising the step of purging isomers of 1-hexene and n-hexane with the purge stream.4. The process according to claim 1 , comprising the additional step of:(I) passing the first bottom stream to a fourth fractionator;(J) withdrawing a fourth overhead stream and a fourth bottom stream from the fourth fractionator;(K) passing optionally at least a part of the fourth overhead stream to a polymerisation reactor.5. The process according to claim 1 , comprising the additional step of:(L) passing optionally at least a part of the third overhead stream to the polymerisation reactor.6. The process according to claim 1 , comprising the additional step of:(M) passing optionally at least a part of the third bottom stream to the polymerisation reactor.7. The process according to claim 1 , comprising the additional steps of:(N) passing optionally at least a part of any of the third bottom stream, third overhead stream or fourth overhead stream to a feed vessel;(O) withdrawing a feed stream from the feed vessel;(P) passing the feed stream via a cooling step to the polymerisation reactor.8. The process according to claim 1 , wherein the stream of the solution comprises ethylene.9. The process according to claim 1 , wherein any of the first claim 1 , second claim 1 , third or fourth fractionators are distillation columns claim 1 , stripping columns claim 1 , multi-phase separators claim 1 , extractors or liquid-liquid separators.10. The process according to claim 1 , wherein at least a part of the purge stream is used as a gasoline additive or as a fuel additive.11. The process according to claim 1 , wherein at least a part of the purge stream sent to a hydrogenation step.12. The process according to claim 1 , wherein ...

REACTOR ASSEMBLY AND METHOD FOR POLYMERIZATION OF OLEFINS

Reactor assembly for the production of polymers including a fluidized bed reactor and method for operating the reactor assembly. 114-. (canceled)1516. A method for polymerizing olefins in a fluidized bed reactor () , wherein the fluidized bed is formed by polymer particles in an upwards rising fluidization gas said upwards rising fluidization gas has a superficial velocity in the middle zone () of from 0.05 to 0.8 m/s , said method comprising the steps of:{'b': 34', '9', '1', '1, '(i) withdrawing a fluidization gas stream () via outlet () from said fluidized bed reactor () at a height of more than 90% of the total height of said fluidized bed reactor ();'}{'b': 34', '42', '36, '(ii) separating polymer particles from said fluidization gas stream () to produce an overhead stream () and a solid recycling stream ();'}{'b': 36', '40, '(iii) branching off from said solid recycling stream () a stream to downstream process stages ();'}{'b': '40', '(iv) directing said stream to downstream process stages () to downstream process stages; and'}{'b': 36', '1, 'claim-text': [{'b': 1', '5', '6', '7', '5', '7', '1', '5', '7, 'wherein said fluidized bed reactor () comprises a bottom zone (), a middle zone () and an upper zone (), the equivalent cross-sectional diameter of the bottom zone () being monotonically increasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor and the equivalent cross-sectional diameter of the upper zone () being monotonically decreasing with respect to the flow direction of the fluidization gas through the fluidized bed reactor (); and wherein there is an unobstructed passageway in the direction of flow of the fluidization gas through the fluidized bed reactor from the bottom zone () to the upper zone (); and'}, {'b': 1', '14', '40, 'the reactor further comprises an outlet for the polymer whereby the polymer stream withdrawn from the fluidized bed reactor () via outlet of the polymer () and the solid recycling ...

METHOD FOR SEPARATING HYDROCARBONS FROM POLYMER

The present invention is directed to a process for separating an olefm copolymer from volatile gases using a flash separator. The flash separator can be used with a solution or high pressure process. The mass transport of volatile gases from the viscous polymer melt is increased. 1. A flash separator comprisinga. an inlet located at the upper part of the flash separator for feeding a reaction solution into the flash separator,b. optionally the inlet is circumvented with an outlet pipe,c. a first outlet within the lower part of the flash separator, andd. a second outlet within the upper part of the flash separatorwherein the inlet has a generally cylindrical wall characterised in that the generally cylindrical wall is perforated with multiple holes having the size of from 15 μm to 1500 μm.2. A process for separating hydrocarbons from a reaction solution comprising a polymer and said hydrocarbons claim 1 , comprising the steps of: passing the reaction solution into the flash separator according to thereby producing a stream of droplets falling downwards within the flash separator; withdrawing a first solution stream comprising the majority of the polymer through the first outlet; and withdrawing a second solution stream comprising mainly hydrocarbons through the second outlet thereby establishing an upwards moving gas stream within the flash separator.3. The process according to wherein the size of the droplets is sufficiently large so that the droplets are not entrained by the upwards moving gas stream.4. The process according to wherein the pressure within the flash separator is from 1 to 500 bar.5. The process according to wherein the temperature within the flash separator is from 100 to 400° C.6. The process according to comprising the step of heating the reaction solution before passing it to the flash separator.7. The process according to comprising the step of reducing the pressure of the reaction solution before passing it to the flash separator.8. The process ...

A METHOD OF RECOVERING OLEFINS IN A SOLUTION POLYMERISATION PROCESS

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterised in that at least a part of the second overhead stream is withdrawn as a purge stream. 1. A process for removing hydrocarbons comprising the steps of:(A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist;(B) withdrawing a vapour stream and a concentrated solution stream from the separator;(C) passing at least a part of the vapour stream into a first fractionator;(D) withdrawing a first overhead stream and a first bottom stream from the first fractionator;(E) passing the first bottom stream to a second fractionator;(F) withdrawing a second overhead stream and a second bottom stream from the second fractionator;characterised in that at least a part of the second overhead stream is withdrawn as a purge stream.2. The process according to wherein the stream of the solution comprises 1-octene and n-hexane and a mixture of isomers of 1-octene and n-octane.3. The process according to comprising a step of purging isomers of 1-octene and n-octane with the purge stream.4. The process according to comprising the additional step of:(G) passing optionally at least a part of the second overhead stream to a polymerisation reactor.5. The process according to comprising the additional step of:(H) passing the first overhead stream to a third fractionator;(I) withdrawing a third ...

PROCESS FOR POLYMERISING ALPHA-OLEFIN MONOMERS

A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of introducing a main feed stream () comprising at least one alpha-olefin monomer into the loop reactor (); introducing a polymerisation catalyst into the loop reactor (); polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor () to produce a slurry comprising polyolefin particles; withdrawing an outlet stream () comprising at least a portion of the slurry from the loop reactor (); adding a first feed stream () comprising the at least one alpha-olefin monomer and/or hydrogen to the outlet stream () to form a concentrator inlet stream (); introducing the concentrator inlet stream () into a concentrator (); withdrawing from the concentrator () an overflow stream () comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the overflow stream () is smaller than in the concentrator inlet stream (); withdrawing from the concentrator () a bottom outlet stream () comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the bottom outlet stream () is greater than in the concentrator inlet stream (); returning the overflow stream () into the loop reactor () in an area different from that from which the outlet stream () is withdrawn. 1. A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of:{'b': 2', '1, '(i) (i) introducing a main feed stream () comprising at least one alpha-olefin monomer into the loop reactor ();'}{'b': '1', '(ii) (ii) introducing a polymerisation catalyst into the loop reactor ();'}{'b': '1', '(iii) (iii) polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor () to produce a slurry comprising polyolefin particles;'}{'b': 4', '1, '(iv) (iv) withdrawing an outlet stream () comprising at least a portion of the slurry from the loop reactor ...

PROCESS FOR WITHDRAWING POLYOLEFINS

A process for withdrawing polyolefins from a solution polymerization reactor comprising: providing—a low pressure separator ,—a washing column ,—a withdrawal line connecting the upper part of the low pressure separator and the washing column—a condenser ,—a condenser-line connecting the top part of the washing column and the condenser—optionally a recycle solvent vessel —optionally a solvent-vessel-line connecting the condenser with the recycle solvent vessel—a reflux line connecting the condenser and the upper part of the washing column or connecting the recycle solvent vessel and the upper part of the washing column—optionally a circulation line fluidly connected to the middle part of the washing column and recycling line —a recycling line connecting the bottom of the washing column and the upper part of the low pressure separator,—optionally a wash recycle heater embedded into the recycling line —optionally a heater embedded into the circulation line (a) continuously withdrawing a liquid solution stream from the solution polymerization reactor and passing said liquid solution stream into the first low pressure separator ; (b) withdrawing a first vapour stream and a first liquid stream from the low pressure separator and passing said first vapour stream via withdrawal line into the washing column (c) withdrawing a second vapour stream from the washing column and feeding it via condenser line to condenser (d) cooling the second vapour stream in condenser 4 so that a part of the second vapour stream condenses thereby producing a condensed second vapour stream and an uncondensed second vapour stream (e) passing the condensed second vapour stream to the upper part of the washing column via reflux line (f) withdrawing a second liquid stream from the washing column and passing at least a part of the second liquid stream to the low pressure separator via recyling line (g) recovering heat from the condenser 1. A process for withdrawing polyolefins from a solution ...

IN-LINE BLENDING PROCESS

An in-line blending process for polymers comprising: (a) providing two or more reactor-low pressure separator units () in parallel configuration, each reactor-low pressure separator unit comprising one reactor () fluidly connected to one low pressure separator () downstream and further a recycling line () connecting the low pressure separator () back to the corresponding reactor (); (b) polymerizing olefm monomers having two or more carbon atoms in each of the reactors () in soltion polymerisation; (c) forming an unreduced reactor effluents stream including a homogenous fluid phase polymer-monomer-solvent mixture in each of the reactors (), (d) passing the unreduced reactor effluents streams from each of the reactors () through the corresponding low pressure separators (), whereby the temperature and pressure of the low pressure separators () is adjusted such that a liquid phase and a vapour phase are obtained, whereby yielding a polymer-enriched liquid phase and a polymer-lean vapour phase, and (e) separating the polymer-lean vapour phase from the polymer-enriched liquid phase in each of the low-pressure separators () to form separated polymer-lean vapour streams and separated polymer-enriched liquid streams; (f) combining the polymer-enriched liquid streams from step (e) in a further low-pressure separator and/or a mixer () to produce a combined polymer-enriched liquid stream (); (g) reintroducing the polymer-lean vapour streams from step (e) via recycling lines () into the corresponding reactors (). 1. An in-line blending process for polymers comprising:{'b': 1', '7', '2', '8', '3', '9', '5', '11', '3', '9', '2', '8, '(a) providing two or more reactor-low pressure separator units (,) in parallel configuration, each reactor-low pressure separator unit comprising one reactor (,) fluidly connected to one low pressure separator (,) downstream and further a recycling line (,) connecting the low pressure separator (,) back to the corresponding reactor (,);'}{'b': 2', ' ...

PROCESS FOR POLYMERIZING OLEFINS IN A FLUIDIZED BED

The present invention is directed to a process for polymerizing olefins in gas phase in a fluidized bed reactor having a vertical body, a generally conical downwards tapering bottom zone, a generally cylindrical middle zone above the bottom zone, and a generally conical upwards tapering top zone above the middle zone. The fluidization gas is withdrawn from the top zone of the reactor, compressed and cooled so that a part of the fluidization gas condenses and then introduced to the bottom zone of the reactor. The bed is thus cooled upon evaporation of the liquid. There is no fluidization grid in the reactor. 1. An olefin polymerization process comprising polymerizing at least one olefin in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body , a generally conical downwards tapering bottom zone , a generally cylindrical middle zone above and connected to said bottom zone , and a generally conical upwards tapering top zone above and connected to said middle zone and wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor , compressed and cooled so that a part of the fluidization gas condenses thus forming a mixture of liquid and gas , and the mixture is returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; (iv) the bed is cooled upon evaporation of the liquid; and (v) there is no fluidization grid in the reactor; characterized in that the amount of the liquid in the mixture introduced into the bottom zone of the reactor is from 0.5 to 20% by weight.3. The process according to characterized in that Nis within the range of from 3 to 5.4. The process according to wherein the amount of the liquid in the mixture introduced into ...

GAS PHASE POLYMERIZATION PROCESS

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed, cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that Nis within the range of from 2.5 to 7. 2. The process according to wherein is within the range of from 2.5 to 5.3. The process according to wherein the ratio L/D is from 4 to 15.4. The process according to wherein the ratio L/D is from 5 to 10.5. The process according to comprising the step of removing polymer from the fluidization gas which has been withdrawn from the top zone of the reactor before the compression and cooling steps.6. The process according to wherein the polymer removed from the fluidization gas is recovered and passed to further processing.7. The process according to wherein the polymer removed from the fluidization gas is returned to the polymerization reactor.8. The process according to wherein polymer is withdrawn from the reactor through an outlet located in the middle zone.9. The process according to wherein the polymer is withdrawn from the reactor continuously.10. The process according to wherein polymer or polymer agglomerates are ...

PROCESS FOR SEPARATING HYDROCARBONS FROM POLYMER

The present invention is directed to a process for separating hydrocarbons from a solution comprising a polymer. The process comprises the steps of: (A) withdrawing a solution stream comprising the polymer from a first vessel; (B) passing the solution stream into a flash vessel; (C) spraying the solution stream into droplets in the first flash vessel thereby establishing a stream of droplets within the flash vessel. The solution forms a downwards falling film within the flash vessel. 19.-. (canceled)10. A process for separating hydrocarbons from a solution comprising a polymer , the process comprising the steps of: (A) withdrawing a solution stream comprising the polymer from a first vessel; (B) passing the solution stream into a vertical flash vessel; (C) spraying the solution stream into droplets in the flash vessel thereby establishing a stream of droplets within the flash vessel; characterised in that either (1) the flash vessel has a generally cylindrical shape and the solution forms a downwards falling film within the flash vessel and wherein the process comprises the step of (D) spraying the solution stream into droplets in the flash vessel thereby establishing a stream of droplets within the flash vessel and directing the stream of droplets to follow a trajectory which is tangential to the wall of the flash vessel; or (2) the flash vessel has a generally conical shape and wherein the process comprises either the step of (D) spraying the solution stream into droplets in the flash vessel thereby establishing a stream of droplets within the flash vessel and directing the stream of droplets to follow a trajectory which is tangential to the wall of the flash vessel; or the step of (E) spraying the solution stream into droplets in the flash vessel thereby establishing a stream of droplets within the flash vessel and directing the stream of droplets to follow a trajectory which is axial to the wall of the flash vessel and wherein the droplets are formed in at least ...

A process for recovering hydrocarbons in a solution polymerisation process

The present invention relates to a process for producing a polymer composition comprising the steps of: (A) polymerising, in a first polymerisation reactor in a first solvent,—a first olefin monomer having two or more carbon atoms, —in the presence of a first polymerisation catalyst for producing a first solution comprising a first polymer of the first olefin monomer and the first solvent; (B) withdrawing a first stream of the first solution from the first polymerisation reactor; (C) passing the first stream of the first solution into a first separator wherein a first liquid phase comprising the polymer and a first vapour phase coexist; (D) withdrawing a first vapour stream and a first concentrated solution stream comprising the polymer from the first separator; (E) passing at least a part of the first vapour stream to a first fractionator; (F) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (G) recovering at least a part of the first overhead stream as a first recycle stream and passing it to the first polymerisation reactor; (H) passing the first concentrated solution stream from the first separator (4) to a second separator (8) wherein a second liquid phase comprising the polymer and a second vapour phase coexist; (I) withdrawing a second vapour stream and a second concentrated solution stream comprising the polymer from the second separator; (J) passing at least a part of the second pour stream to a second fractionator; (K) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (L) recovering at least a part of the second overhead stream as a second recycle stream and passing it to the first polymerisation reactor; (M) passing the second concentrated solution stream from the second separator to a third separator wherein a third liquid phase comprising the polymer and a third vapour phase coexist; characterised in that the mass flow rate of the first recycle stream is at least 80% ...

A process and apparatus for in-line blending of polymers

The present invention deals with a process for polymerising olefins in a solution and withdrawing a stream of the solution from the polymerisation reactor and passing it to a sequence of heating steps. The heated solution is passed to a separation step, which is conducted at a pressure of no more than 15 bar and in which separation step a liquid phase comprising the polymer and a vapour phase coexist. A vapour stream and a concentrated solution stream comprising the polymer are withdrawn from the separation step. At least a part of the vapour stream is passed to the first polymerisation reactor, to the second polymerisation reactor or to both.

A METHOD FOR WITHDRAWING AGGLOMERATES FROM A FLUIDISED BED REACTOR

The present invention relates to a process and apparatus for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a bottom zone having a generally conical shape and no fluidisation grid. The agglomerates are withdrawn by using an agglomerate trap below the bottom zone. A value of a process variable indicative of the content of agglomerates in the agglomerate trap is measured and the opening time of the valves transferring polymer to and from the agglomerate trap is adjusted based on the measured value. 1. A method for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor , the polymerisation reactor comprising a middle zone having a generally cylindrical shape , a bottom zone having a generally conical shape in direct contact with and below the middle zone and wherein a base of a fluidised bed is formed , and wherein there is no fluidisation grid in the fluidised bed reactor and an agglomerate trap below the bottom zone , the agglomerate trap having a body , a first connection comprising a first valve connecting the body to the bottom zone and a second connection comprising a second valve connecting the body to agglomerate recovery system and wherein the reactor does not comprise a fluidisation grid , the method comprising the steps of measuring a value of a process variable indicative of the content of agglomerates in the agglomerate trap; and adjusting the opening time of the first valve or the second valve or both the first valve and the second valve based on the measured value.211. A method according to comprising the steps of (i) opening the first valve; (ii) keeping the first valve open for a first time period t; (iii) closing the first valve; (iv) opening the second valve; and (v) closing the second valve; wherein the steps (i) to (v) are conducted in a repeated sequence claim 1 , characterised in that the method comprises the additional step of (vi) adjusting the first time ...

Inlet system for settled bed polymerization reactors

Screening assembly and process for screening polymer from an effluent stream at reduced levels of polymer entrainment

A process for screening polymer from a polymer-lean vapor stream, whereby the process comprises the steps of separating an effluent stream comprising the polymer and a first mixture of hydrocarbons into a polymer-rich stream and the polymer-lean vapor stream; spraying a condensed vapor composition comprising a second mixture of hydrocarbons into the polymer-lean vapor stream via a condensed vapor composition stream; screening a screened condensed vapor composition stream comprising the polymer and the condensed vapor composition from the polymer-lean vapor stream.

Reactor assembly and method for polymerization of olefins

Reactor assembly for the production of polymers including a fluidized bed reactor and method for operating the reactor assembly. The reactor assembly comprises gas/solid separation means, a flow through device (29) in the solid recycling line (35) that varies the solid recycling stream that is recycled back to the fluidized bed reactor (1).

Reactor assembly and method for polymerization of olefins

Reactor assembly for the production of polymers including a fluidized bed reactor and method for operating the reactor assembly.

Process for polymerising alpha-olefin monomers

A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of introducing a main feed stream (2) comprising at least one alpha-olefin monomer into the loop reactor (1); introducing a polymerisation catalyst into the loop reactor (1); polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor (1) to produce a slurry comprising polyolefin particles; withdrawing an outlet stream (4) comprising at least a portion of the slurry from the loop reactor (1); adding a first feed stream (9) comprising the at least one alpha-olefin monomer and/or hydrogen to the outlet stream (4) to form a concentrator inlet stream (8); introducing the concentrator inlet stream (8) into a concentrator (5); withdrawing from the concentrator (5) an overflow stream (6) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the overflow stream (6) is smaller than in the concentrator inlet stream (8); withdrawing from the concentrator (5) a bottom outlet stream (12) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the bottom outlet stream (12) is greater than in the concentrator inlet stream (8); returning the overflow stream (6) into the loop reactor (1) in an area different from that from which the outlet stream (4) is withdrawn.

Polymerization process

The disclosure relates to a polymerization process. The polymerization process comprises polymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer. The polymerization process comprises withdrawingan exhaust stream of the solution from the polymerization reactor in a withdrawing step. The polymerization process comprises separating the exhaust stream to a first primary stream and a primary concentrated solution stream in a first primary separation step, wherein the first primary stream comprises hydrocarbons and polymer. The polymerization process comprises separating the first primary stream to a second primary stream and a third primary stream in a second primary separation step, wherein the second primary stream comprises dissolved polymer and the third primary stream comprises majority of the hydrocarbons. The polymerization process comprises cooling the third primary stream to a temperature of -80 to 20 °C in a primary cooling step to obtain a cooled third primary stream. The polymerization process comprises separating the cooled third primary stream to a fourth primary stream and a fifth primary stream in a third primary separation step, wherein the fourth primary stream comprises hydrocarbons in vapour phase and the fifth primary stream comprises liquid hydrocarbons. The polymerization process comprises returning the fourth primary stream and the fifth primary stream independently in a primary returning step to a location upstream of the polymerization reactor.

OLEFIN POLYMERIZATION PROCESS

processo de polimerização de olefina. a presente invenção é direcionada a um processo para polimerização de olefinas na fase gasosa, em um reator de leito fluidizado com corpo vertical, uma zona de fundo normalmente cônica afunilando para baixo, uma abrangente zona intermediária cilíndrica acima da zona de fundo, uma zona cilíndrica de topo geralmente cônica para cima, acima da zona intermediária. o gás de fluidização é retirado da zona de topo do reator, comprimido e resfriado de modo que uma parte do gás de fluidização condensa e então é introduzido à zona de fundo do reator. o leito é então resfriado por evaporação do líquido. não há grade de fluidização no reator. olefin polymerization process. the present invention is directed to a process for the polymerization of olefins in the gas phase, in a fluidized bed reactor with vertical body, a normally tapered bottom zone tapering downwards, a comprehensive cylindrical intermediate zone above the bottom zone, a cylindrical zone top generally tapered upwards, above the intermediate zone. the fluidization gas is removed from the top zone of the reactor, compressed and cooled so that a part of the fluidization gas condenses and is then introduced to the bottom zone of the reactor. the bed is then cooled by evaporation of the liquid. there is no fluidization grid in the reactor.

processo de polimerização de olefinas

PROCESSO DE POLIMERIZAÇÃO DE OLEFINAS. A presente invenção refere-se a um processo de polimerização de olefinas que compreende a polimerização de olefinas em fase gasosa num leito fluidizado na presença de um catalisador de polimerização de olefinas em um reator de polimerização que possui um corpo vertical; uma zona inferior geralmente cônica afunilada para baixo; uma zona média geralmente cilíndrica com uma razão da altura para o diâmetro L/D de pelo menos 4, acima e conectada à referida zona inferior; e uma zona superior geralmente cônica afunilada para cima acima e conectada à referida zona média em que (i) o gás de fluidização é introduzido à zona inferior do reator a partir de onde ele passa para cima através do reator; (ii) o gás de fluidização é retirado da zona superior do reator, filtrado, comprimido, arrefecido e devolvido para a zona inferior do reator; (iii) um leito fluidizado é formado no interior do reator em que as partículas de polímero em crescimento são suspensas no fluxo de gás ascendente; e (iv) não há nenhuma grelha de fluidização no reator; caracterizado pelo fato de que a velocidade do gás é mantida no reator de tal modo que NBr está dentro (...).

Device and process for preparing a feed stream for solution polymerization

A feeding device for preparing a feed stream for a solution polymerization, comprising a feed vessel, the feed vessel comprising a top zone and a bottom zone; a feed outlet for withdrawing the feed stream, wherein the feed outlet is positioned at the bottom zone; a waste outlet for withdrawing a waste vapour stream, wherein the waste outlet is positioned at the top zone; a first heat exchanger positioned below the top zone; an absorber positioned below the first heat exchanger; a first inlet for introducing a fresh liquid stream into or on top of the absorber, wherein the first inlet is positioned at the absorber; a second inlet for introducing a recycle liquid stream, wherein the second inlet is positioned below the first inlet; and a third inlet for introducing a recycle vapour stream, wherein the third inlet is positioned below the second inlet and above the feed outlet.

Process

The invention provides process for separating hydrogen from a fluid feed stream in a polymerisation process, comprising the steps i) polymerising an olefin monomer and optionally at least one olefin comonomer in the presence of a solvent, optionally in the presence of hydrogen, so as to form a polymerisation reaction mixture comprising a polyolefin polymer, unreacted monomer(s), solvent andhydrogen; ii) separating said polyolefin polymer from said unreacted monomer(s), solvent and hydrogen, and optionally feeding said unreacted monomer(s), solvent and hydrogen to a heat exchanger,so as to produce said fluid feed stream comprising unreacted monomer(s), solvent and hydrogen; and iii) contacting said fluid feed stream with a heterogeneous hydrogenation catalyst so as to form a hydrogen-lean fluid stream.

Process for polymerizing olefins in a fluidized bed

Gas phase polymerization process

Process for polymerising alpha-olefin monomers

A method for withdrawing agglomerates from a fluidised bed reactor

The present invention relates to a process and apparatus for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a bottom zone having a generally conical shape and no fluidisation grid. The agglomerates are withdrawn by using an agglomerate trap below the bottom zone. A value of a process variable indicative of the content of agglomerates in the agglomerate trap is measured and the opening time of the valves transferring polymer to and from the agglomerate trap is adjusted based on the measured value.

Polymerization Process

The polymerization process comprises polymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer. 1. A polymerization process , comprisingpolymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer;withdrawing an exhaust stream of the solution from the polymerization reactor in a withdrawing step;separating the exhaust stream to a first primary stream and a primary concentrated solution stream in a first primary separation step, wherein the first primary stream comprises hydrocarbons and polymer;separating the first primary stream to a second primary stream and a third primary stream in a second primary separation step, wherein the second primary stream comprises dissolved polymer and the third primary stream comprises majority of the hydrocarbons;cooling the third primary stream to a temperature of −80 to 20° C. in a primary cooling step to obtain a cooled third primary stream;separating the cooled third primary stream to a fourth primary stream and a fifth primary stream in a third primary separation step, wherein the fourth primary stream comprises hydrocarbons in vapour phase and the fifth primary stream comprises liquid hydrocarbons; andreturning the fourth primary stream and the fifth primary stream independently in a primary returning step to a location upstream of the polymerization reactor.2. The polymerization process according to claim 1 , wherein the third primary stream is cooled in the cooling step to a temperature of −80 to 10° C.3. The polymerization process according to claim 1 , wherein the fourth primary stream and the fifth primary stream are fed in the returning step ...

Process for the polymerization of olefins in solution comprising deactivating the polymerization catalyst by heat

The present invention relates to a polymerization process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerization reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, c) withdrawing the reaction mixture from the polymerization reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer and comonomer, catalyst, and hydrocarbon solvent, d) heating the reactor outlet stream to a temperature which is at least 5 °C higher than the temperature of the reaction mixture at the outlet of the reactor for a time period of between 1 and 250 seconds in order to de-activate the polymerization catalyst, and e) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerization reactor without further purification steps.

Gas phase polymerization process

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed , cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that N Br is within the range of from 2.5 to 7.

Process for polymerizing olefins in a fluidized bed

The present invention is directed to a process for polymerizing olefins in gas phase in a fluidized bed reactor having a vertical body, a generally conical downwards tapering bottom zone, a generally cylindrical middle zone above the bottom zone, and a generally conical upwards tapering top zone above the middle zone. The fluidization gas is withdrawn from the top zone of the reactor, compressed and cooled so that a part of the fluidization gas condenses and then introduced to the bottom zone of the reactor. The bed is thus cooled upon evaporation of the liquid. There is no fluidization grid in the reactor.

Reactor assembly and method for polymerization of olefins

Reactor assembly for the production of polymers including a fluidized bed reactor and method for operating the reactor assembly. The reactor assembly comprises gas/solid separation means, a flow through device (29) in the solid recycling line (35) that varies the solid recycling stream that is recycled back to the fluidized bed reactor (1).

A method for withdrawing agglomerates from a fluidised bed reactor

Process for polymerizing olefins in a fluidized bed

The present invention is directed to a process for polymerizing olefins in gas phase in a fluidized bed reactor having a vertical body, a generally conical downwards tapering bottom zone, a generally cylindrical middle zone above the bottom zone, and a generally conical upwards tapering top zone above the middle zone. The fluidization gas is withdrawn from the top zone of the reactor, compressed and cooled so that a part of the fluidization gas condenses and then introduced to the bottom zone of the reactor. The bed is thus cooled upon evaporation of the liquid. There is no fluidization grid in the reactor.

Reactor assembly and process for olefin polymerization

Procedimiento para polimerizar olefinas en un reactor (1) de lecho fluidizado, en el que el lecho fluidizado está formado por partículas de polímero en un gas de fluidización ascendente, teniendo dicho gas de fluidización ascendente una velocidad superficial en la zona central (6) de 0,05 a 0,8 m/s, comprendiendo dicho procedimiento las etapas de: (i) retirar una corriente (34) de gas de fluidización a través de la salida (9) de dicho reactor (1) de lecho fluidizado a una altura superior al 90 % de la altura total de dicho reactor (1) de lecho fluidizado; (ii) separar las partículas de polímero de dicha corriente (34) de gas de fluidización utilizando medios de separación gas/sólido (2) para producir una corriente (42) de cabeza y una corriente (36) de recirculación de sólidos; (iii) derivar, a partir de dicha corriente (36) de recirculación de sólidos, una corriente hasta etapas de proceso aguas abajo (40); (iv) dirigir dicha corriente hasta etapas de proceso aguas abajo (40) hasta las fases de proceso aguas abajo; y (v) recircular la corriente (36) de recirculación de sólidos a dicho reactor (1) de lecho fluidizado; en el que dicho reactor (1) de lecho fluidizado comprende una zona inferior (5), una zona central (6) y una zona superior (7), aumentando el diámetro equivalente de la sección transversal de la zona inferior (5), de manera estrictamente monótona, con respecto a la dirección de flujo del gas de fluidización a través del reactor (1) de lecho fluidizado y disminuyendo el diámetro equivalente de la sección transversal de la zona superior (7), de manera monótona, con respecto a la dirección de flujo del gas de fluidización a través del reactor (1) de lecho fluidizado; en el que la zona inferior (5), la zona central (6) y la zona superior (7) se diferencian en cuanto a su diámetro equivalente de la sección transversal, y en el que existe un paso no obstruido en la dirección de flujo del gas de fluidización a través del reactor (1) de lecho fluidizado desde ...

PROCESS

a invenção fornece um processo para separar hidrogênio de uma corrente de alimentação gasosa em um processo de polimerização, compreendendo as etapas i) polimerizar um monômero de olefina e, opcionalmente, pelo menos um comonômero de olefina na presença de um solvente, opcionalmente na presença de hidrogênio, de modo a formar uma mistura de reação de polimerização compreendendo um polímero de poliolefina, monômero(s) não reagido(s), solvente e hidrogênio; (ii) separar o dito polímero de poliolefina do(s) monômero(s) não reagido(s), solvente e hidrogênio, de modo a formar a dita corrente de alimentação de vapor compreendendo monômero(s) não reagido(s), solvente e hidrogênio; (iii) alimentar a dita corrente de alimentação de vapor a um trocador de calor, de modo a formar uma corrente de alimentação de líquido compreendendo monômero(s) não reagido(s), solvente e hidrogênio; e (iv) colocar a dita corrente de alimentação de líquido em contato com uma coluna de remoção de leito compactado, de modo a formar uma corrente gasosa rica em hidrogênio e uma corrente líquida pobre em hidrogênio. the invention provides a process for separating hydrogen from a gaseous feed stream in a polymerization process, comprising steps i) polymerizing an olefin monomer and, optionally, at least one olefin comonomer in the presence of a solvent, optionally in the presence of hydrogen, to form a polymerization reaction mixture comprising a polyolefin polymer, unreacted monomer (s), solvent and hydrogen; (ii) separating said polyolefin polymer from the unreacted monomer (s), solvent and hydrogen, so as to form said vapor supply stream comprising unreacted monomer (s), solvent and hydrogen; (iii) feeding said steam supply stream to a heat exchanger so as to form a liquid supply stream comprising unreacted monomer (s), solvent and hydrogen; and (iv) placing said liquid supply stream in contact with a compacted bed removal column, so as to form a hydrogen rich gas stream and a hydrogen low liquid ...

Process for the polymerization of olefins in solution comprising deactivating the polymerization catalyst by heat

The present invention relates to a polymerization process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerization reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, c) withdrawing the reaction mixture from the polymerization reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer and comonomer, catalyst, and hydrocarbon solvent, d) heating the reactor outlet stream to a temperature which is at least 5 °C higher than the temperature of the reaction mixture at the outlet of the reactor for a time period of between 1 and 250 seconds in order to de-activate the polymerization catalyst, and e) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerization reactor without further purification steps.

PROCESS

trata-se de um processo para separar hidrogênio de uma corrente de alimentação de fluido em um processo de polimerização, que compreende as etapas i) polimerizar um monômero de olefina e, opcionalmente, pelo menos um comonômero de olefina na presença de um solvente, opcionalmente na presença de hidrogênio, de modo a formar uma mistura de reação de polimerização compreendendo um polímero de poliolefina, monômero(s) não reagido(s), solvente e hidrogênio; ii) separar o dito polímero de poliolefina do(s) monômero(s) não reagido(s), solvente e hidrogênio e opcionalmente alimentar o(s) dito(s) monômero(s) não reagido(s), solvente e hidrogênio a um trocador de calor, de modo a produzir a dita corrente de alimentação de fluido compreendendo monômero(s) não reagido(s), solvente e hidrogênio; e iii) colocar a dita corrente de alimentação de fluido em contato com um catalisador de hidrogenação heterogêneo, de modo a formar uma corrente de fluido pobre em hidrogênio. it is a process for separating hydrogen from a fluid supply stream in a polymerization process, which comprises steps i) polymerize an olefin monomer and, optionally, at least one olefin comonomer in the presence of a solvent, optionally in the presence of hydrogen, to form a polymerization reaction mixture comprising a polyolefin polymer, unreacted monomer (s), solvent and hydrogen; ii) separating said polyolefin polymer from the unreacted monomer (s), solvent and hydrogen and optionally feeding said unreacted monomer (s), solvent and hydrogen to a heat exchanger, in order to produce said fluid supply stream comprising unreacted monomer (s), solvent and hydrogen; and iii) placing said fluid supply stream in contact with a heterogeneous hydrogenation catalyst, so as to form a fluid stream low in hydrogen.

Process

The invention provides a process for separating hydrogen from a gaseous feed stream in a polymerisation process, comprising the steps i) polymerising an olefin monomer and optionally at least one olefin comonomer in the presence of a solvent, optionally in the presence of hydrogen, so as to form a polymerisation reaction mixture comprising a polyolefin polymer, unreacted monomer(s), solvent and hydrogen; (ii) separating said polyolefin polymer from said unreacted monomer(s), solvent and hydrogen so as to form said vapour feed stream comprising unreacted monomer(s), solvent and hydrogen; (iii) feeding said vapour feed stream to a heat exchanger so as to form a liquid feed stream comprising unreacted monomer(s), solvent and hydrogen; and (iv) contacting said liquid feed stream with a packed-bed stripping column so as to form a hydrogen-rich gaseous stream and a hydrogen-lean liquid stream.

Process for polymerising alpha-olefin monomers

A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of introducing a main feed stream (2) comprising at least one alpha-olefin monomer into the loop reactor (1); introducing a polymerisation catalyst into the loop reactor (1); polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor (1) to produce a slurry comprising polyolefin particles; withdrawing an outlet stream (4) comprising at least a portion of the slurry from the loop reactor (1); adding a first feed stream (9) comprising the at least one alpha-olefin monomer and/or hydrogen to the outlet stream (4) to form a concentrator inlet stream (8); introducing the concentrator inlet stream (8) into a concentrator (5); withdrawing from the concentrator (5) an overflow stream (6) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the overflow stream (6) is smaller than in the concentrator inlet stream (8); withdrawing from the concentrator (5) a bottom outlet stream (12) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the bottom outlet stream (12) is greater than in the concentrator inlet stream (8); returning the overflow stream (6) into the loop reactor (1) in an area different from that from which the outlet stream (4) is withdrawn.

Process for polymerising alpha-olefin monomers

A process for polymerising alpha-olefin monomers in a loop reactor comprising the steps of introducing a main feed stream (2) comprising at least one alpha-olefin monomer into the loop reactor (1); introducing a polymerisation catalyst into the loop reactor (1); polymerising the at least one alpha-olefin monomer in the presence of the polymerisation catalyst in the loop reactor (1) to produce a slurry comprising polyolefin particles; withdrawing an outlet stream (4) comprising at least a portion of the slurry from the loop reactor (1); adding a first feed stream (9) comprising the at least one alpha-olefin monomer and/or hydrogen to the outlet stream (4) to form a concentrator inlet stream (8); introducing the concentrator inlet stream (8) into a concentrator (5); withdrawing from the concentrator (5) an overflow stream (6) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the overflow stream (6) is smaller than in the concentrator inlet stream (8); withdrawing from the concentrator (5) a bottom outlet stream (12) comprising the polyolefin particles, wherein the concentration of the polyolefin particles in the bottom outlet stream (12) is greater than in the concentrator inlet stream (8); returning the overflow stream (6) into the loop reactor (1) in an area different from that from which the outlet stream (4) is withdrawn.

In-line blending process

An in-line blending process for polymers comprising: (a) providing in parallel, two reactor-low pressure separator units (1,7) comprising one reactor (2,8) fluidly connected to one low pressure separator (3,9) by a recycling line (5,11); (b) polymerizing olefin monomers having two or more carbon atoms in each reactor (2,8); (c) forming an unreduced reactor effluents stream including a homogenous fluid phase polymer-monomer-solvent mixture in each reactor (2,8); (d) passing the effluents streams through the low pressure separators (3,9), and adjusting temperatures and pressures therein to yield polymer-enriched liquid and polymer-lean vapour phases; and (e) separating the phases to form separated polymer-lean vapour streams and separated polymer-enriched liquid streams; (f) combining the polymer-enriched liquid streams in a further low-pressure separators and/or a mixer (13) to produce a combined polymer-enriched liquid stream (16); and (g) reintroducing the polymer-lean vapour streams via recycling lines (5,11) into the reactors (2,8).

High temperature solution process for the copolymerization of a-olefins

A process for the solution polymerization of a polymer from an a-olefin monomer and one or more a-olefin comonomers in the presence of a catalyst, the process having a catalyst performance index (CPI) not higher than 15, wherein the catalyst performance index is defined according to equation (I), wherein F C2 and F C8 are the feed velocities of the monomer and comonomer feed streams in kg/h, F Cat is the feed velocity of the catalyst and the catalyst productivity is the weight ratio of produced polymer to catalyst.

High temperature solution process for the copolymerization of alpha-olefins

A process for the polymerization of a polymer from an α-olefin monomer and one or more α-olefin comonomers in the presence of a catalyst, the process having a catalyst performance index (CPI) not higher than 15, wherein the catalyst performance index is defined according to equation (I): CPI = F C 2 + F C 8 / F Cat Catalyst Productivity wherein F C2 and F C8 are the feed velocities of the monomer and comonomer feed streams in kg/h, F Cat is the feed velocity of the catalyst and the catalyst productivity is the weight ratio of produced polymer to catalyst.

High temperature solution process for the copolymerization of ethylene with one ore more α-Olefin comonomer(s)

A process for the polymerization of a polymer from an a-olefin monomer and one or more a-olefin comonomers in the presence of a catalyst, the process having a variation of reactor temperature and monomers concentrations (VTC) higher than 0, wherein the variation of reactor temperature and monomers concentrations (VTC) fulfils the criteria of equation (I): wherein Tf, Tb and Tt are the inlet feed temperature, the reactor temperature positioned 90° or more from the feeding point and the outlet temperature, respectively. (C 8 lC 2 )in and (C 8 lC 2 )out are the ratios of the concentrations of comonomer to monomer at the inlet and outlet, respectively.

Process for polymerizing olefins in a fluidized bed

The present invention is directed to a process for polymerizing olefins in gas phase in a fluidized bed reactor having a vertical body, a generally conical downwards tapering bottom zone, a generally cylindrical middle zone above the bottom zone, and a generally conical upwards tapering top zone above the middle zone. The fluidization gas is withdrawn from the top zone of the reactor, compressed and cooled so that a part of the fluidization gas condenses and then introduced to the bottom zone of the reactor. The bed is thus cooled upon evaporation of the liquid. There is no fluidization grid in the reactor.

Gas phase polymerization process

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed, cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that N Br is within the range of from 2.5 to 7.

Method for withdrawing agglomerates from a fluidized bed polymerization reactor

The present invention relates to a process and apparatus for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a bottom zone having a generally conical shape and no fluidisation grid. The agglomerates are withdrawn by using an agglomerate trap below the bottom zone. A value of a process variable indicative of the content of agglomerates in the agglomerate trap is measured and the opening time of the valves transferring polymer to and from the agglomerate trap is adjusted based on the measured value.

A separating device and process for separating volatile compounds from a polymer reaction mixture

The current application is related to a separating device for separating volatile compounds from a polymer reaction mixture comprising a gravimetric separator, having a gravimetric vessel, an inlet for feeding the polymer reaction mixture, a first outlet located in the lower part of the gravimetric vessel for withdrawing a first polymer-rich stream, and a second outlet located in the upper part of the gravimetric vessel for withdrawing a first polymer-lean stream; and a flash separator having a flash vessel, a first inlet for feeding a second polymer-lean stream split from the first polymer-lean stream, a first outlet located at the lower part of the flash vessel for withdrawing a liquid stream, and a second outlet located at the upper part of the flash vessel for withdrawing a gaseous stream, wherein the second outlet of the separator vessel is fluidly connected to the first inlet of the flash vessel. Furthermore, the present application is related to a A process for separating volatile compounds from a reaction mixture comprising a polymer and said volatile compounds, comprising the steps of passing the reaction mixture through the inlet into the gravimetric vessel of the gravimetric separator of a separating device according to the present invention, withdrawing a first polymer-rich stream comprising mainly polymer through the first outlet of the gravimetric vessel, withdrawing a first polymer-lean stream comprising mainly volatile compounds through the second outlet of the gravimetric vessel, passing at least a part of the polymer-lean stream as a second polymer-lean stream through the first inlet into the flash vessel of the flash separator of the separating device according to the present invention, withdrawing a liquid stream through the first outlet of the flash vessel, and withdrawing a gaseous stream through the second outlet of the flash vessel.

A process for recovering hydrocarbons in a solution polymerisation process

The present invention relates to a process for producing a polymer composition comprising the steps of: (A) polymerising, in a first polymerisation reactor in a first solvent, - a first olefin monomer having two or more carbon atoms, - in the presence of a first polymerisation catalyst for producing a first solution comprising a first polymer of the first olefin monomer and the first solvent; (B) withdrawing a first stream of the first solution from the first polymerisation reactor; (C) passing the first stream of the first solution into a first separator wherein a first liquid phase comprising the polymer and a first vapour phase coexist; (D) withdrawing a first vapour stream and a first concentrated solution stream comprising the polymer from the first separator; (E) passing at least a part of the first vapour stream to a first fractionator; (F) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (G) recovering at least a part of the first overhead stream as a first recycle stream and passing it to the first polymerisation reactor; (H) passing the first concentrated solution stream from the first separator (4) to a second separator (8) wherein a second liquid phase comprising the polymer and a second vapour phase coexist; (I) withdrawing a second vapour stream and a second concentrated solution stream comprising the polymer from the second separator; (J) passing at least a part of the second vapour stream to a second fractionator; (K) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (L) recovering at least a part of the second overhead stream as a second recycle stream and passing it to the first polymerisation reactor; (M) passing the second concentrated solution stream from the second separator to a third separator wherein a third liquid phase comprising the polymer and a third vapour phase coexist; characterised in that the mass flow rate of the first recycle stream is at least ...

Process for recovering hydrocarbons in a solution polymerisation process

A process for producing a polymer composition comprising the steps (A) to (M) as recited herein, involving the polymerization, in a polymerization reactor of a first polymer, a first stream thereof being passed into a first separator wherein a first liquid phase comprising the polymer and a first vapor phase coexist; withdrawing a first vapor stream and a first concentrated solution stream comprising the polymer from the first separator, passing at least a part of the first vapor stream to a first fractionator; withdrawing a first overhead stream and a first bottom stream from the first fractionator; recovering at least a part of the first overhead stream as a first recycle stream and passing it to the polymerization reactor; passing the first concentrated solution stream from the first separator to a second separator, wherein a second liquid phase comprising the polymer and a second vapor phase coexist; passing at least a part of the second vapor stream to a second fractionator; withdrawing a second overhead stream and a second bottom stream from the second fractionator; recovering at least a part of the second overhead stream as a second recycle stream and passing it to the polymerization reactor; wherein the mass flow rate of the first recycle stream is at least 80% of the mass flow rate of the first vapor stream and the mass flow rate of the second recycle stream is at least 70% of the mass flow rate of the second vapor stream.

PROCESS TO PRODUCE A POLYMERIC COMPOSITION

PROCESSO PARA PRODUZIR UMA COMPOSIÇÃO POLIMÉRICA. Trata-se de um processo para polimerizar olefinas em uma solução e retirar uma corrente da solução a partir do reator de polimerização e passar a mesma a uma sequência de etapas de aquecimento. A solução aquecida é passada a uma etapa de separação, que é conduzida em uma pressão de não maior doque1,5 MPa (15 bar), e em que uma fase líquidade etapa de separação que compreende o polímero e uma fase de vapor coexistem. Uma corrente de vapor e uma corrente de solução concentrada que compreende o polímero são retiradas a partir da etapa de separação. Pelo menos uma parte da corrente de vapor é passada ao primeiro reator de polimerização, ao segundo reator de polimerização ou a ambos. PROCESS FOR PRODUCING A POLYMERIC COMPOSITION. It is a process for polymerizing olefins in a solution and withdrawing a stream of the solution from the polymerization reactor and passing it through a sequence of heating steps. The heated solution is passed to a separation step, which is conducted at a pressure of not more than 1.5 MPa (15 bar), and in which a liquid phase of the separation step comprising the polymer and a vapor phase coexist. A stream of steam and a stream of concentrated solution comprising the polymer are withdrawn from the separation step. At least a part of the steam stream is passed to the first polymerization reactor, the second polymerization reactor, or both.

A separating device and process for separating volatile compounds from a polymer reaction mixture

The current application is related to a separating device for separating volatile compounds from a polymer reaction mixture comprising a gravimetric separator, having a gravimetric vessel, an inlet for feeding the polymer reaction mixture, a first outlet located in the lower part of the gravimetric vessel for withdrawing a first polymer-rich stream, and a second outlet located in the upper part of the gravimetric vessel for withdrawing a first polymer-lean stream; and a flash separator having a flash vessel, a first inlet for feeding a second polymer-lean stream split from the first polymer-lean stream, a first outlet located at the lower part of the flash vessel for withdrawing a liquid stream, and a second outlet located at the upper part of the flash vessel for withdrawing a gaseous stream, wherein the second outlet of the separator vessel is fluidly connected to the first inlet of the flash vessel. Furthermore, the present application is related to a A process for separating volatile compounds from a reaction mixture comprising a polymer and said volatile compounds, comprising the steps of passing the reaction mixture through the inlet into the gravimetric vessel of the gravimetric separator of a separating device according to the present invention, withdrawing a first polymer-rich stream comprising mainly polymer through the first outlet of the gravimetric vessel, withdrawing a first polymer-lean stream comprising mainly volatile compounds through the second outlet of the gravimetric vessel, passing at least a part of the polymer-lean stream as a second polymer-lean stream through the first inlet into the flash vessel of the flash separator of the separating device according to the present invention, withdrawing a liquid stream through the first outlet of the flash vessel, and withdrawing a gaseous stream through the second outlet of the flash vessel.

Process for obtaining low volatile plastomers

A process for reducing the volatile organic compound content of granular plastomers having a density of equal to or lower than 883 kg/m3 and a MFR2 of 100.0 g/10 min or lower (ISO 1133 at 2.16 kg load and 190° C.), to below 65 ppm (VOC, VDA277), the process comprising the steps of providing a granular raw plastomer in a treatment vessel, the granular raw plastomer having a density of equal to or lower than 883 kg/m3, and a MFR2 of 100.0 g/10 min or lower (ISO 1133 at 2.16 kg load and 190° C.), and a volatile organic compound content (VOC, VDA277) of above 150 ppm, subjecting said granular raw plastomer to a gasflow within the range of 30 m3/(h t) to 150 m3/(h t) for an aeration time of less than 96 hours, whereby the gas has a minimum temperature of at least 26° C. measured at a gas inlet of the treatment vessel and a maximum temperature of 4° C. below the Vicat temperature (10 N, ISO 306) of the granular raw plastomer or 35° C. measured at the gas inlet of the treatment vessel, whatever value is lower; and recovering the granular plastomer.

Process for providing a homogenous slurry containing particles

The present invention is concerned with a process for providing a homogeneous particle-containing slurry comprising the steps of: (a) providing a vessel comprising at least one impeller rotating around a vertical axis of the vessel, wherein a rotational speed n 1 of the at least one impeller is higher than n min according to equation (1), the vessel further comprising an inlet and an outlet; (b) introducing a particle-containing slurry into the vessel or introducing components forming the particle-containing slurry into the vessel; (c) rotating the at least one impeller at least around the vertical axis for homogenizing and/or maintaining a homogeneous particle distribution within the slurry; (d) withdrawing the homogeneous particle-containing slurry via the outlet; (e) reducing the rotational speed n 1 of the at least one impeller to a reduced rotational speed n red , whereas n red is lower than n 1 and higher or equal than n min according to equation (1): n min = S v 0.1 D p 0.2 g Δ ρ ρ f 0.45 B 0.13 D a 0.85

Ethylene copolymers with improved melting and glass transition temperature

The present inventions concerns a copolymer of ethylene and an C3 to C8 alpha-olefin, wherein the copolymer has a density of 890 to 915 kg/m3 measured according to ISO 1183 and a MFR2 of 0.5 to 8.0 g/10min measured according to ISO 1133, wherein the alpha-olefin is present in the copolymer in an amount of 10 to 20 wt.%, wherein the copolymer has a melt point Tm between 100 and 120°C measured according to ISO 11357-3 and a Vicat softening temperature Tvicat of 80 to 96 °C.

Ethylene copolymers with improved melting and glass transition temperature

The present inventions concerns a copolymer of ethylene and an C3 to C8 alpha-olefin, wherein the copolymer has a density of 870 to 890 kg/m 3 measured according to ISO 1183, a MFR 2 of 0.5 to 8.0 g/10min measured according to ISO 1133, wherein the alpha-olefin is present in the copolymer in an amount of 20 to 35 wt.-%, wherein the copolymer has a first melting temperature T m1 measured according to ISO 11357-3, characterized in that the first melt point T m1 is between 90 and 115 °C.

Separator and process for separating volatile compounds from a polymer solution

The present invention is concerned with a separator comprising a vessel, a first inlet, a second inlet, a first outlet, a second outlet, and a separation device located downstream of the first outlet, wherein the separation device comprises two outlets, whereas one outlet of the separation device is fluidly connected to the second inlet of the vessel. Furthermore, the present invention is also concerned with a process for separating hydrocarbons from a reaction solution comprising a polymer and said hydrocarbons, comprising the steps of passing the reaction solution through the first inlet into the separator according to the invention, withdrawing a first outlet stream through the first outlet, withdrawing a second outlet stream through the second outlet, separting the first outlet stream in the separation device to produce a first separated stream and a second separated stream, withdrawing the first separated stream from the separation device and passing the first separated stream through the second inlet into the vessel, and withdrawing the second separated stream from the separation device.

Process for providing a homogenous slurry containing particles

The present invention is concerned with a process for providing a homogeneous particle-containing slurry comprising the steps of: (a) providing a vessel comprising at least one impeller rotating around a vertical axis of the vessel, the vessel further comprising an inlet and an outlet; (b) introducing the particle-containing slurry into the vessel or introducing components forming the particle-containing slurry into the vessel; (c) rotating the at least one impeller at least around the vertical axis for homogenizing and/or maintaining a homogeneous particle distribution within the slurry; (d) withdrawing the homogeneous particle-containing slurry via the outlet; (e) stopping the at least one impeller for a maximum time T, whereby T is calculated according to the following relations: u T = 4 g ρ p − ρ f D p 3 ρ f C D C D = 24 Re 1 + 0.173 R e 0.657 T = h u T

Polymerization process

The disclosure relates to a polymerization process. The polymerization process comprises polymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer. The polymerization process comprises withdrawingan exhaust stream of the solution from the polymerization reactor in a withdrawing step. The polymerization process comprises separating the exhaust stream to a first primary stream and a primary concentrated solution stream in a first primary separation step, wherein the first primary stream comprises hydrocarbons and polymer. The polymerization process comprises separating the first primary stream to a second primary stream and a third primary stream in a second primary separation step, wherein the second primary stream comprises dissolved polymer and the third primary stream comprises majority of the hydrocarbons. The polymerization process comprises cooling the third primary stream to a temperature of -80 to 20 °C in a primary cooling step to obtain a cooled third primary stream. The polymerization process comprises separating the cooled third primary stream to a fourth primary stream and a fifth primary stream in a third primary separation step, wherein the fourth primary stream comprises hydrocarbons in vapour phase and the fifth primary stream comprises liquid hydrocarbons. The polymerization process comprises returning the fourth primary stream and the fifth primary stream independently in a primary returning step to a location upstream of the polymerization reactor.

Polymerization process and reactor for controlling molecular weight distribution and comonomer composition distribution

A reactor for the polymerization of olefins comprising a first inlet for introducing a first stream comprising monomer(s), catalyst(s) and optionally hydrogen, solvent or comonomer(s) and/or mixtures thereof, at least one outlet for withdrawing a product stream, characterized in that the reactor further comprises at least one second inlet for introducing a second stream comprising monomer(s), catalyst(s) and optionally hydrogen, solvent or comonomer(s) and/or mixtures thereof; and a process for polymerizing olefins in a reactor according to the present invention, comprising the steps of introducing monomer(s), catalyst(s), and optionally hydrogen, solvent or comonomer(s) and/or mixtures thereof as the first stream via the first inlet into the reactor forming a reaction mixture; polymerizing a polymer from the reaction mixture; withdrawing the product stream via the at least one outlet from the reactor; characterized in that the process comprises a further step of introducing a second stream comprising monomer(s), catalyst(s), and optionally hydrogen, solvent or comonomer(s) and/or mixtures thereof into the reactor via the at least one second inlet into the reactor.

A process for recovering hydrocarbons in a solution polymerisation process

The present invention relates to a solution polymerisation process for producing a polymer composition involving separating and recovering the volatile components of the reaction mixture downstream of the polymerisation process, thereby reducing energy consumption of the recovery section. The process comprises polymerising a first olefin monomer having two or more carbon atoms in a polymerisation reactor (2); separating a first vapour stream and a first concentration solution stream from the polymerisation reactor (2) and fractionating to obtain a first recycle stream, separating a second vapour stream from the first concentration solution stream and fractionating to obtain a second recycle stream. The mass flow rate of the first recycle stream is at least 80 % of the mass flow rate of the first vapour stream and the mass flow rate of the second recycle stream is at least 70 % of the mass flow rate of the second vapour stream.

A method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator

The present invention relates to a method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator, comprising the steps of: (i) Selecting the diameter of the polymer droplets in the polymer solution entering the separator; (ii) Determining the traveling time of the polymer droplets in the separator; and (iii) Adjusting the residence time of the polymer-dense phase in the separator to be at least the traveling time of the polymer droplets, a solution polymerization process using said method for reducing the entrainment of polymer in the polymer-lean liquid phase in the separator and the use of said method for determining the minimum residence time of the polymer solution in the separator required to ensure efficient separation of a polymer solution into a polymer-lean phase and a polymer-rich phase.

A method of recovering olefins in a solution polymerisation process

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first overhead stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (G) passing the second overhead stream to a third fractionator; (H) withdrawing a third overhead stream and a third bottom stream from the third fractionator; characterised in that at least a part of the third bottom stream is withdrawn as a purge stream.

processo para copolimerizar etileno, uso de um hidrocarboneto inerte

Processo para copolimerizar etileno e pelo menos um C3 a C8 alfa-olefina para obter um copolímero de etileno-C3 a C8 alfa-olefina, compreendendo o processo a) copolimerização de etileno e pelo menos um C3 a C8 alfa-olefina em um solvente em um reator de polimerização em solução para obter uma solução intermediária de polímero, b) descarregar uma corrente de efluente da solução intermediária de polímero para um trocador de calor, c) definir a temperatura da corrente de efluente no trocador de calor para obter uma corrente de efluente aquecida, d) alimentar a corrente de efluente aquecido a uma separação instantânea, e) separar pelo menos uma parte do copolímero de etileno-C3 a C8 alfa olefina na separação instantânea, caracterizado por alimentar um hidrocarboneto inerte que atinge 90 °C <t (bp)="" <130="" °c="" ao="" reator="" de="" polimerização="" em="" solução;="" e="" ou="" acumular="" um="" hidrocarboneto="" inerte="" que="" atinge="" 90=""></t><t="" durante="" a="" reação="" polimerização;="" alimentar="" à="" corrente="" efluente="" descarregado="" da="" etapa="" b).<="" font=""> </t="">

Polymerization process

The disclosure relates to a polymerization process, comprising providing a monomer stream, the monomer stream comprising an alpha-olefin monomer; providing a comonomer stream, the comonomer stream comprising at least one alpha-olefin comonomer; providing a hydrocarbon solvent stream, the hydrocarbon solvent stream comprising a hydrocarbon solvent capable of dissolving the alpha-olefin monomer and the alpha-olefin comonomer in polymerization conditions; providing an activated catalyst stream, the activated catalyst stream comprising activated polymerization catalyst; passing the monomer stream having a temperature in the range of greater than -30 °C to less than 10 °C into a polymerization reactor; passing the comonomer stream having a temperature in the range of greater than -30 °C to less than 10 °C into the polymerization reactor; passing the hydrocarbon solvent stream having a temperature in the range of greater than -30 °C to less than 10 °C into the polymerization reactor; passing the activated catalyst stream into the polymerization reactor; contacting the monomer stream, the comonomer stream, the hydrocarbon solvent stream and the activated catalyst stream in a polymerization reactor to form a reaction mixture comprising an alpha-olefin polymer; withdrawing a first product stream from the polymerization reactor, the first product stream comprising hydrocarbon solvent and alpha-olefin polymer dissolved in the hydrocarbon solvent; and a separation step for separating a second product stream and a third product stream from the first product stream, wherein the second product stream comprises majority of the alpha-olefin polymer present in the first product stream.

Screening assembly and process for screening polymer from an effluent stream at reduced levels of polymer entrainment

The present invention is concerned with a screening assembly comprising a separating device connected to a conduit for an effluent stream comprising a polymer and a mixture of hydrocarbons, wherein the separating device is configured to separate the effluent stream into a polymer-rich stream and a polymer-lean vapor stream, wherein the first separation device comprises an inlet, a first outlet for withdrawing a polymer-rich stream, and a second outlet for withdrawing a polymer-lean vapor stream, a screening device connected to the separating device via a conduit for the polymer-lean vapor stream, wherein the screening device comprises a first inlet connected to the conduit for the polymer-lean vapor stream, a first outlet for withdrawing a cleaned vapor stream, a second outlet for withdrawing a polymer-comprising condensed vapor stream, and at least one second inlet for introducing a condensed vapor stream.

Polymerization process and arrangement

The disclosure relates to a polymerization process, comprising − providing a first hydrocarbon stream comprising first olefin monomer, first comonomer and solvent in a first providing step, wherein solvent is obtained from a solvent source; − combining the first hydrocarbon stream with hydrocarbons recycled from at least one downstream process step to a first combined hydrocarbon stream in a first combining step; − polymerizing the first olefin monomer and the first comonomer in the presence of a first polymerization catalyst in a first polymerization step in the solvent to produce a first solution comprising a first polymer of the first olefin monomer and the first comonomer; − withdrawing a first exhaust stream of the first solution in a first withdrawing step; − separating the first exhaust stream to a first primary hydrocarbon stream and a first concentrated solution stream in a first primary separation step; − recycling the first primary hydrocarbon stream to the first combining step in a first primary recycling step; − separating the first concentrated solution stream to a first secondary hydrocarbon stream and a first polymer product stream in a first secondary separation step; − recycling the first secondary hydrocarbon stream to the first combining step in a first secondary recycling step; − providing a second hydrocarbon stream comprising second olefin monomer, second comonomer and solvent in a second providing step, wherein the solvent is obtained from the solvent source; − combining the second hydrocarbon stream with hydrocarbons recycled from at least one downstream process step to a second combined hydrocarbon stream in a second combining step; − polymerizing the second olefin monomer and the second comonomer in the presence of a second polymerization catalyst in a second polymerization step in the solvent to produce a second solution comprising a second polymer of the second olefin monomer and the second comonomer; − withdrawing a second exhaust ...

HIGH TEMPERATURE SOLUTION PROCESS FOR THE COPOLYMERIZATION OF α-OLEFINS

A process for the solution polymerization of a polymer from an α-olefin monomer and one or more α-olefin comonomers in the presence of a catalyst, the process having a catalyst performance index (CPI) not higher than 15, wherein the catalyst performance index is defined according to equation (I), wherein F C2 and F C8 are the feed velocities of the monomer and comonomer feed streams in kg/h, F Cat is the feed velocity of the catalyst and the catalyst productivity is the weight ratio of produced polymer to catalyst.

Method for separating hydrocarbons from polymer

The invention is a flash separator for separating an olefin copolymer mixture from volatile gases. The flash separator can be used with a solution or high pressure process. The object is to increase the mass transfer of volatile gases from the polymer melt.

Inlet system for settled bed polymerization reactors

Polymerization process

The disclosure relates to a polymerization process. The polymerization process comprises polymerizing an olefin monomer and a comonomer in the presence of a polymerization catalyst in a polymerization step conducted in a polymerization reactor in a solvent to produce a solution comprising a polymer of the olefin monomer and the comonomer. The polymerization process comprises withdrawingan exhaust stream of the solution from the polymerization reactor in a withdrawing step. The polymerization process comprises separating the exhaust stream to a first primary stream and a primary concentrated solution stream in a first primary separation step, wherein the first primary stream comprises hydrocarbons and polymer. The polymerization process comprises separating the first primary stream to a second primary stream and a third primary stream in a second primary separation step, wherein the second primary stream comprises dissolved polymer and the third primary stream comprises majority of the hydrocarbons. The polymerization process comprises cooling the third primary stream to a temperature of -80 to 20 °C in a primary cooling step to obtain a cooled third primary stream. The polymerization process comprises separating the cooled third primary stream to a fourth primary stream and a fifth primary stream in a third primary separation step, wherein the fourth primary stream comprises hydrocarbons in vapour phase and the fifth primary stream comprises liquid hydrocarbons. The polymerization process comprises returning the fourth primary stream and the fifth primary stream independently in a primary returning step to a location upstream of the polymerization reactor.

Inlet system for settled bed polymerization reactors

Settled bed polymerization reactor, having several inlet-levels comprising at least one inlet comprising at least one inlet per level for injection of monomer, comonomer, co-reactant and/or inert component distributed over the height of the reactor, wherein the vertical distance between two adjacent inlet-levels is equal to or lower than 0.25 x height of the reactor; and wherein the number of inlet-levels is at least [height of the reactor / 0.25 x height of the reactor] - 1; and wherein the height/diameter ratio of the reactor is larger than 3.

Process for the polymerization of olefins in solution with controlled activity of catalyst in reactor outlet stream

The present invention relates to a polymerisation process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerisation reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, whereby the average residence time in the reactor is chosen to be between 0.5 and 30 minutes, c) withdrawing the reaction mixture from the polymerisation reactor as a reactor outlet stream which comprises the ethylene-alpha- olefin co-polymer, unreacted monomer, catalyst, and hydrocarbon solvent, and d) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerisation reactor without further purification steps, wherein in step c) no more than 5 wt.% of catalyst in an active state is leaving the reactor.

Plant and method for the production of an in-line blended polymer

The present inventions concerns a plant producing an in-line blended polymer comprising a first polymerisation reactor and a second polymerisation reactor, the first and second polymerisation reactors having different internal volumes, and a method for producing an in-line blended polymer.

Ethylene-octene copolymers with improved property profile

Ethylene-1-octene copolymer characterized by a density in the range of 850 kg/m 3 to 930 kg/m 3 measured according to ISO 1183-187, a melt flow rate MFR 2 (190°C, 2.16 kg) in the range of from 0.3 g/10 min to 100 g/10 min measured according to ISO 1133, a MFR 10 /MFR 2 of from 5.0 to 15.0, a Mw/Mn of from 2.0 to 5.0, 1.0 to below 20 vinyl unsaturation units /100,000 C atoms, more than 5.0 to 35 vinylidene unsaturation units /100,000 C atoms, more than 5.0 to 30 vinylene unsaturation units /100,000 C atoms, more than 15.0 to 60 trisubstituted unsaturation units / 100,000 C atoms, 26 to 150 total unsaturation units /100,000 C atoms, wherein the total unsaturation units /100,000 C atoms is the sum of vinyl unsaturation units /100,000 C atoms, vinylidene unsaturation units /100,000 C atoms, vinylene unsaturation units /100,000 C atoms and trisubstituted unsaturation units /100,000 C atoms, an unsaturation degree for unsaturation types e) to h) according to formula (I) wherein a vinyl unsaturation degree is in the range of from 5.0 to 15.0 %,, a vinylene unsaturation degree is in the range of from 20.0 to 30.0 %, and wherein the sum of the vinyl unsaturation degree and vinylidene unsaturation degree is at least 30.0% and up to 50.0%.

A separating device and process for separating volatile compounds from a polymer reaction mixture

The current application is related to a separating device for separating volatile compounds from a polymer reaction mixture comprising a gravimetric separator, having a gravimetric vessel, an inlet for feeding the polymer reaction mixture, a first outlet located in the lower part of the gravimetric vessel for withdrawing a first polymer-rich stream, and a second outlet located in the upper part of the gravimetric vessel for withdrawing a first polymer-lean stream; and a flash separator having a flash vessel, a first inlet for feeding a second polymer-lean stream split from the first polymer-lean stream, a first outlet located at the lower part of the flash vessel for withdrawing a liquid stream, and a second outlet located at the upper part of the flash vessel for withdrawing a gaseous stream, wherein the second outlet of the separator vessel is fluidly connected to the first inlet of the flash vessel. Furthermore, the present application is related to a A process for separating volatile compounds from a reaction mixture comprising a polymer and said volatile compounds, comprising the steps of passing the reaction mixture through the inlet into the gravimetric vessel of the gravimetric separator of a separating device according to the present invention, withdrawing a first polymer-rich stream comprising mainly polymer through the first outlet of the gravimetric vessel, withdrawing a first polymer-lean stream comprising mainly volatile compounds through the second outlet of the gravimetric vessel, passing at least a part of the polymer-lean stream as a second polymer-lean stream through the first inlet into the flash vessel of the flash separator of the separating device according to the present invention, withdrawing a liquid stream through the first outlet of the flash vessel, and withdrawing a gaseous stream through the second outlet of the flash vessel.

Device and process for preparing a feed stream for solution polymerization

A feeding device for preparing a feed stream for a solution polymerization, comprising a feed vessel, the feed vessel comprising a top zone and a bottom zone; a feed outlet for withdrawing the feed stream, wherein the feed outlet is positioned at the bottom zone; a waste outlet for withdrawing a waste vapour stream, wherein the waste outlet is positioned at the top zone; a first heat exchanger positioned below the top zone; an absorber positioned below the first heat exchanger; a first inlet for introducing a fresh liquid stream into or on top of the absorber, wherein the first inlet is positioned at the absorber; a second inlet for introducing a recycle liquid stream, wherein the second inlet is positioned below the first inlet; and a third inlet for introducing a recycle vapour stream, wherein the third inlet is positioned below the second inlet and above the feed outlet.

A method of recovering olefins in a solution polymerisation process

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterised in that at least a part of the second overhead stream is withdrawn as a purge stream.

A method of recovering olefins in a solution polymerisation process

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first overhead stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (G) passing the second overhead stream to a third fractionator; (H) withdrawing a third overhead stream and a third bottom stream from the third fractionator; characterised in that at least a part of the third bottom stream is withdrawn as a purge stream.

Process for withdrawing polyolefins

In an embodiment, there is provided a process for withdrawing polyolefins from a solution polymerization reactor, including: continuously withdrawing a liquid solution stream from the reactor; withdrawing first vapour and liquid streams from a low pressure separator and passing the vapour stream into a washing column; withdrawing a second vapour stream from the washing column and feeding to a condenser; cooling the second vapour stream to condense a part of the second vapour stream thereby producing condensed and uncondensed second vapour streams; passing the condensed stream to an upper part of the washing column; withdrawing a second liquid stream from the washing column and passing at least a part thereof to the low pressure separator; and recovering heat from the condenser. The process may permit configuration to allow more efficient and continuous separation of polyolefins from a reaction mixture after polymerization.

Screening assembly and process for screening polymer from an effluent stream at reduced levels of polymer entrainment

A process for screening polymer from a polymer-lean vapor stream, whereby the process comprises the steps of separating an effluent stream comprising the polymer and a first mixture of hydrocarbons into a polymer-rich stream and the polymer-lean vapor stream; spraying a condensed vapor composition comprising a second mixture of hydrocarbons into the polymer-lean vapor stream via a condensed vapor composition stream; screening a screened condensed vapor composition stream comprising the polymer and the condensed vapor composition from the polymer-lean vapor stream.

In-line blending process

An in-line blending process for polymers comprising: (a) providing two or more reactor-low pressure separator units (1,7) in parallel configuration, each reactor-low pressure separator unit comprising one reactor (2,8) fluidly connected to one low pressure separator (3,9) downstream and further a recycling line (5,11) connecting the low pressure separator (3,9) back to the corresponding reactor (2,8); (b) polymerizing olefin monomers having two or more carbon atoms in each of the reactors (2,8) in solution polymerisation; (c) forming an unreduced reactor effluents stream including a homogenous fluid phase polymer-monomer-solvent mixture in each of the reactors (2,8), (d) passing the unreduced reactor effluents streams from each of the reactors (2,8) through the corresponding low pressure separators (3,9), whereby the temperature and pressure of the low pressure separators (3,9) is adjusted such that a liquid phase and a vapour phase are obtained, whereby yielding a polymer-enriched liquid phase and a polymer-lean vapour phase, and (e) separating the polymer-lean vapour phase from the polymer- enriched liquid phase in each of the low-pressure separators (3,9) to form separated polymer-lean vapour streams and separated polymer-enriched liquid streams; (f) combining the polymer-enriched liquid streams from step (e) in a further low-pressure separator and/or a mixer (13) to produce a combined polymer-enriched liquid stream (16); (g) reintroducing the polymer-lean vapour streams from step (e) via recycling lines (5,11) into the corresponding reactors (2,8).

A method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator

The present invention relates to a method of reducing the entrainment of polymer in the polymer-lean liquid phase in a separator, comprising the steps of: (i) Selecting the diameter of the polymer droplets in the polymer solution entering the separator; (ii) Determining the traveling time of the polymer droplets in the separator; and (iii) Adjusting the residence time of the polymer-dense phase in the separator to be at least the traveling time of the polymer droplets, a solution polymerization process using said method for reducing the entrainment of polymer in the polymer-lean liquid phase in the separator and the use of said method for determining the minimum residence time of the polymer solution in the separator required to ensure efficient separation of a polymer solution into a polymer-lean phase and a polymer-rich phase.

A method of recovering olefins in a solution polymerisation process

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterised in that at least a part of the second overhead stream is withdrawn as a purge stream.

Phase-stabilized ethylene alpha olefin copolymerization process

A process for copolymerizing ethylene and at least one C3 to C8 alpha olefin to obtain an ethylene-C3 to C8 alpha olefin copolymer, the process comprising a) copolymerizing ethylene and at least one C3 to C8 alpha olefin in a solvent in a solution polymerization reactor to obtain an intermediate polymer solution, b) discharging an effluent stream from the intermediate polymer solution into a heat exchanger, c) setting the temperature of the effluent stream in the heat exchanger to obtain a heated effluent stream, d) feeding the heated effluent stream to a flash separation, e) separating at least a part of the ethylene-C3 to C8 alpha olefin copolymer in the flash separation, characterized by feeding an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C to the solution polymerization reactor; and/or accumulating an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C during the polymerization reaction; and/or feeding an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C to the discharged effluent stream of step b).

Process and apparatus for in-line blending of polymers

The present invention deals with a process for polymerising olefins in a solution and withdrawing a stream of the solution from the polymerisation reactor and passing it to a sequence of heating steps. The heated solution is passed to a separation step, which is conducted at a pressure of no more than 15 bar and in which separation step a liquid phase comprising the polymer and a vapour phase coexist. A vapour stream and a concentrated solution stream comprising the polymer are withdrawn from the separation step. At least a part of the vapour stream is passed to the first polymerisation reactor, to the second polymerisation reactor or to both.

Screening assembly and process for screening polymer from an effluent stream at reduced levels of polymer entrainment

The present invention is concerned with a screening assembly comprising a separating device connected to a conduit for an effluent stream comprising a polymer and a mixture of hydrocarbons, wherein the separating device is configured to separate the effluent stream into a polymer-rich stream and a polymer-lean vapor stream, wherein the first separation device comprises an inlet, a first outlet for withdrawing a polymer-rich stream, and a second outlet for withdrawing a polymer-lean vapor stream, a screening device connected to the separating device via a conduit for the polymer-lean vapor stream, wherein the screening device comprises a first inlet connected to the conduit for the polymer-lean vapor stream, a first outlet for withdrawing a cleaned vapor stream, a second outlet for withdrawing a polymer-comprising condensed vapor stream, and at least one second inlet for introducing a condensed vapor stream.

Method for separating hydrocarbons from polymer

The invention is a flash separator for separating an olefin copolymer mixture from volatile gases. The flash separator can be used with a solution or high pressure process. The object is to increase the mass transfer of volatile gases from the polymer melt.

Process for obtaining low volatile plastomers

Process for reducing the volatile organic compound content of plastomer having a density of equal to or lower than 883 kg/m3 and - a M FR2 of 100.0 g/1 0 min or lower (ISO 1 133 at 2.1 6 kg load and 190 °C); to below 65 ppm(VOC, VDA277), the process comprising the steps of a) providing raw plastomer in granular form, the raw plastomer having a density of equal to or lower than 883 kg/m3; and a MFR2 of 100.0 g/10 min or lower (ISO 1 1 33 at 2.1 6 kg load and 190 °C); and a volatile organic compound content (VOC, VDA277) of above 1 50 ppm, and the granules having an average D50 diameter of 2.5 to 4.5 mm b) subjecting said granular raw plastomer to at least one intensive hydrodynamic regime at a minimum temperature of at least 20 °C and a maximum temperature of 4 °C below the Vicat temperature (1 0 N, ISO 306) of the granular raw plastomer or 35 °C, whatever value is lower, with the temperature measured at the gas inlet to the fast-fluidization regime, c) recovering the granular plastomer.

Process for removing volatile components from an olefin polymer and article obtained

Procedure to separate hydrocarbons from a polymer

Procedimiento para separar hidrocarburos de una solución que comprende un polímero, comprendiendo el procedimiento las etapas de: (A) extraer una corriente de solución que comprende el polímero de un primer recipiente; (B) hacer pasar la corriente de solución al interior de un recipiente de evaporación instantánea vertical que tiene, generalmente, forma cilíndrica; (C) pulverizar la corriente de solución en gotitas en el primer recipiente de evaporación instantánea para establecer de este modo una corriente de gotitas dentro del recipiente de evaporación 10 instantánea; (F) dirigir la corriente de gotitas para que sigan una trayectoria que es tangencial a la pared del recipiente de evaporación instantánea; caracterizado por que la solución forma una película descendente dentro del recipiente de evaporación instantánea. Process for separating hydrocarbons from a solution comprising a polymer, the process comprising the steps of: (A) extracting a stream of solution comprising the polymer from a first container; (B) passing the solution stream into a vertical instantaneous evaporation vessel that is generally cylindrical in shape; (C) spraying the solution stream into droplets in the first instant evaporation vessel to thereby establish a stream of droplets within the instant evaporation vessel 10; (F) direct the droplet stream to follow a path that is tangential to the wall of the instant evaporation vessel; characterized in that the solution forms a falling film inside the instant evaporation vessel.

Process for the polymerization of olefins in solution with controlled activity of catalyst in reactor outlet stream

The present invention relates to a polymerisation process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerisation reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, whereby the average residence time in the reactor is chosen to be between 0.5 and 30 minutes, c) withdrawing the reaction mixture from the polymerisation reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer, catalyst, and hydrocarbon solvent, and d) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerisation reactor without further purification steps, wherein in step c) no more than 5 wt.% of catalyst in an active state is leaving the reactor.

Method for separating hydrocarbons from polymer

The present invention is directed to a process for separating an olefin copolymer from volatile gases using a flash separator. The flash separator can be used with a solution or high pressure process. The mass transport of volatile gases from the viscous polymer melt is increased.