Method for conveying a liquid f containing at least one (meth)acrylic monomer

A method of delivering a fluid containing at least one (meth)acrylic monomer by a pump in which a pump cavity and drive compartment are separated by a separator compartment filled with a barrier medium at elevated pressure and that is sealed with double-acting slide ring packings.

Method for filling a vertical tube with catalyst particles

A method of charging a vertical tube having an internal diameter of 50 mm or less with catalyst particles, which comprises introducing a filling aid into the vertical tube, where the filling aid comprises a flexible elongated body and the ratio of the cross section of the flexible elongated body to the cross section of the tube is from 0.003 to 0.08, and introducing the catalyst particles into the tube.

Cleaning of apparatus in which meth(acrylic) acid-containing organic solvents have been treated and/or generated

A process for cleaning apparatus in which (meth)acrylic acid-containing organic solvents have been treated and/or generated and contain fouling and/or polymer and residues of organic solvent, in which the apparatus contents are subjected to a steam distillation in the apparatus.

Cleaning of apparatus in which meth(acrylic) acid-containing organic solvents have been treated and/or generated

A process for cleaning apparatus in which (meth)acrylic acid-containing organic solvents have been treated and/or generated and contain fouling and/or polymer and residues of organic solvent, in which the apparatus contents are subjected to a steam distillation in the apparatus.

Method for the continuous extraction of ( meth) acrylic acid

A process for the continuous recovery of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation comprising the following process stages is proposed: I quenching of the reaction gas by evaporative cooling using a high-boiling solvent, II separation of the (meth)acrylic acid from the quenched reaction gas by absorption into the high-boiling solvent, III separation of the solvent laden with (meth)acrylic acid by rectification into a first part-stream IIIA), which contains predominantly (meth)acrylic acid, and into a second part-stream IIIB) which contains predominantly the solvent, IV recycling of the stream IIIB) to process stage II and V distillative production of (meth)acrylic acid from stream IIIA), all liquid residual streams obtained in process stage V being recycled to process stage I.

Method for conveying a liquid F containing at least one (meth)acrylic monomer

A method of delivering a fluid containing at least one (meth)acrylic monomer by a pump in which a pump cavity and drive compartment are separated by a separator compartment filled with a baffler medium at elevated pressure and that is sealed with double-acting slide ring packings.

Thermal separating process

Thermal separating process between at least one gaseous and at least one liquid stream, of which at least one comprises (meth)acrylic monomers, in a separating column whose separating internals are mass transfer trays, in which the liquid stream is polymerization-inhibited and used for spraying the surface of the separating column, and internal surfaces which are in the shadow region of the spraying are removed from the shadow region by covering.

Cleaning of tray columns which have been used for rectificatively treating liquids comprising (meth)acrylic acid and/or esters thereof

In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase differential pressure over all trays of at least 0.5 mbar/tray.

Method and device for the two-step production of acrylic acid

... α,β-ethylenically unsaturated aldehydes and/or carboxylic acids are prepared by means of a two-stage catalytic gas-phase oxidation in which a gas mixture comprising at least an alkane or alkene having from three to six carbon atoms and oxygen is subjected to a catalytic oxidation reaction, in the first stage (1). oxygen is added to the gases produced in the first stage (1) and the resulting mixture is introduced into the second stage (2) in which it is subjected to a further catalytic oxidation reaction. In the process of the present invention, a signal which correlates with the oxygen content of the reaction gases before and/or after the addition of oxygen between the first and second stages (1, 2) is generated and the oxygen addition is regulated as a function of the signal. Also provided are an apparatus for regulating a process for preparing α,β-ethylenically unsaturated aldehydes and/or carboxylic acids and an apparatus for preparing these substances using the regulating apparatus ...

Method for filling a vertical tube with catalyst particles

A method of charging a vertical tube having an internal diameter of 50 mm or less with catalyst particles, which comprises introducing a filling aid into the vertical tube, where the filling aid comprises a flexible elongated body and the ratio of the cross section of the flexible elongated body to the cross section of the tube is from 0.003 to 0.08, and introducing the catalyst particles into the tube.

Quenching of a hot gas mixture comprising (meth) acrylic acid

In a process for quenching a hot gas mixture comprising (meth)acrylic acid by direct cooling by means of a cooling liquid in a spray cooler, the cooling liquid is atomized in the spray cooler by means of an impingement atomizer.

Thermal separating process

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Thermal separating process

... (Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separating column, and in at least one of the streams being (meth)acrylic monomers; and spraying the inner surface of the separating column with the descending liquid stream that contains the dissolved polymerization inhibitor, and the separating column having internals, certain areas of which are shadow regions of the sprayed descending liquid stream; and which shadow regions are equipped by covering means which prevent contact of the shadow regions with (meth)acrylic monomers and consequently undesired polymerization of monomer.

Method and device for the two-step production of acrylic acid

... α,β-ethylenically unsaturated aldehydes and/or carboxylic acids are prepared by means of a two-stage catalytic gas-phase oxidation in which a gas mixture comprising at least an alkane or alkene having from three to six carbon atoms and oxygen is subjected to a catalytic oxidation reaction, in the first stage (1). Oxygen is added to the gases produced in the first stage (1) and the resulting mixture is introduced into the second stage (2) in which it is subjected to a further catalytic oxidation reaction. In the process of the present invention, a signal which correlates with the oxygen content of the reaction gases before and/or after the addition of oxygen between the first and second stages (1, 2) is generated and the oxygen addition is regulated as a function of the signal. Also provided are an apparatus for regulating a process for preparing α,β-ethylenically unsaturated aldehydes and/or carboxylic acids and an apparatus for preparing these substances using the regulating apparatus ...

Thermal separating process

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Method and device for the two-step production of acrylic acid

... alpha,beta-ethylenically unsaturated aldehydes and/or carboxylic acids are prepared by means of a two-stage catalytic gas-phase oxidation in which a gas mixture comprising at least an alkane or alkene having from three to six carbon atoms and oxygen is subjected to a catalytic oxidation reaction, in the first stage ( 1 ). oxygen is added to the gases produced in the first stage ( 1 ) and the resulting mixture is introduced into the second stage ( 2 ) in which it is subjected to a further catalytic oxidation reaction. In the process of the present invention, a signal which correlates with the oxygen content of the reaction gases before and/or after the addition of oxygen between the first and second stages ( 1, 2 ) is generated and the oxygen addition is regulated as a function of the signal. Also provided are an apparatus for regulating a process for preparing alpha,beta-ethylenically unsaturated aldehydes and/or carboxylic acids and an apparatus for preparing these substances using the ...

Method for the continuous extraction of (meth)acrylic acid

A process for the continuous recovery of (meth)acrylic acid from the reaction gas of a catalytic gas-phase oxidation comprising the following process stages is proposed: I quenching of the reaction gas by evaporative cooling using a high-boiling solvent, II separation of the (meth)acrylic acid from the quenched reaction gas by absorption into the high-boiling solvent, III separation of the solvent laden with (meth)acrylic acid by rectification into a first part-stream IIIA), which contains predominantly (meth)acrylic acid, and into a second part-stream IIIB) which contains predominantly the solvent, IV recycling of the stream IIIB) to process stage II and V distillative production of (meth)acrylic acid from stream IIIA), all liquid residual streams obtained in process stage V being recycled to process stage I.

Method for cleaning plate columns used for rectifying liquids containing (meth)acrylic acid and/or the esters thereof

In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase differential pressure over all trays of at least 0.5 mbar/tray.

Absorptive separation of acrylic acid, useful for the production water absorbents and adhesives, comprises recycling organic raffinate from the acid water extraction to the absorption unit at least one theoretical stage below its head

Process for the absorptive separation of acrylic acid from a product gas mixture, resulting from a heterogeneously catalyzed gas phase oxidation of propene comprises cooling of the product mixture and feeding to an absorption unit with recycling of the organic raffinate from the acid water extraction to the absorption unit whereby the recycle is carried out at least one theoretical stage below the head of the absorption unit. Process for the absorptive separation of acrylic acid from a product gas mixture, resulting from a heterogeneously catalyzed gas phase oxidation of propene to acrylic acid and containing acrylic acid and water vapor as well as by-products comprising low boiling material, middle boiling material, high boiling material and material that is difficult to condense, comprises cooling of the product mixture; passage of the cooled product mixture by counter current flow into an absorption unit containing an ascending high boiling point liquid hydrophobic organic absorption agent with avoidance of the formation of a liquid aqueous phase; cooling of the non-absorbed residual product mixture in a condensation unit with condensation of the water vapor and low boiling point material as acid water; recycling of a partial quantity as a diluent gas to the gas phase oxidation of propene with a partial quantity used as a stripping gas after passage through a washing unit to remove acrylic acid and disposal of the remaining gas; passage of a small amount of the absorbed liquid containing acrylic acid to a distillation unit as a high boiling point outlet that is recycled, as a vapor phase by heating, back to the absorption unit and the remaining high boiling point material is disposed of; the liquid outlet from the absorption unit containing acrylic acid is fed to a desorption unit and low boiling point material removed by the stripping gas with recycle of the stripping gas containing low boiling point material to the absorption unit; passage of the absorption ...

Cleaning a plate-type column that has been used to rectify (meth)acrylic acid and/or (meth)acrylate esters by passing a basic liquid downwards through the column comprises passing a gas upwards through the column

Method for cleaning a plate-type column that has been used to rectify (meth)acrylic acid and/or (meth)acrylate esters by passing a basic liquid downwards through the column comprises passing a gas upwards through the column so that the mean pressure drop is at least 0.5 mbar per plate.

Method and device for the two-stage production of acrylic acid

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von alpha,beta-ethylenisch ungesättigten Aldehyden und/oder Carbonsäuren durch eine zweistufige katalytische Gasphasenoxidation, bei dem in der ersten Stufe (1) zumindest ein Alkan oder Alken mit drei bis sechs Kohlenstoffatomen und Sauerstoff enthaltendes Gasgemisch einer katalytischen Oxidationsreaktion unterzogen wird. Den in der ersten Stufe (1) erzeugten Gasen wird Sauerstoff zugeführt und das resultierende Gemisch wird in die zweite Stufe (2) eingeleitet, in der es einer weiteren katalytischen Oxidationsreaktion unterzogen wird. Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, daß ein Signal gewonnen wird, das mit dem Sauerstoffgehalt der Reaktionsgase vor und/oder nach der Zufuhr von Sauerstoff zwischen der ersten und zweiten Stufe (1, 2) korreliert ist, und daß die Sauerstoffzufuhr in Abhängigkeit von dem Signal geregelt wird. Ferner betrifft die Erfindung eine Vorrichtung zum Regeln eines Verfahrens zur Herstellung von alpha,beta-ethylenisch ungesättigten Aldehyden und/oder Carbonsäuren sowie eine Vorrichtung zur Herstellung dieser Stoffe mit der erfindungsgemäßen Regelvorrichtung.

Vector for the bacterial expression of recombinant antibody- and/or cytokine-toxin fusion proteins

Vector for expressing a recombinant fusion toxin (I), consisting of a toxin (II) and a ligand (III) specific for particular tumour cells, has coding sequences: (a) for a region of an antibody (Ab) and/or cytokine; and (b) for (II) or its catalytically active region and also sequences for segments that allow detection and characterisation of the recombinant protein and unique restriction enzyme (RE) cleavage sites. The vector has a multiple cloning site (MCS) for insertion of variable Ab regions, and is provided with a (G4S)3 linker and is directly compatible with known phage systems (pCANTAB and pHEN), provided that the unique RE sites in MCS are not present in the coding region for the appropriate modified toxin.

PROCESS FOR THE MANUFACTURE OF NICOTINE ACID.

A process for the preparation of nicotinamide by amidation of a nicotinic acid/nicotinamide melt, vacuum distillation of the amidation mixture, removal of the nicotinamide as the bottom product and recycling of the top product, depleted with respect to nicotinamide, into the amidation stage together with addition of fresh amounts of nicotinic acid.

Method for rapidly cooling a hot gas mixture containing (meth)acrylic acid

The invention relates to a method for rapidly cooling a hot gas mixture containing (meth)acrylic acid, by means of a direct cooling process using a cooling liquid in a spray cooler, the atomisation of the cooling liquid in the spray cooler being carried out by an impact atomiser.

Method for cleaning plate columns used for rectifying liquids containing (meth)acrylic acid and/or the esters thereof

Method for the continuous extraction of (meth)acrylic acid

The invention relates to a method for the continuous extraction of (meth)acrylic acid from the reaction gas of catalytic gas phase oxidation. The inventive method comprises the following steps: (I) the reaction gas is quenched by evaporative cooling using a high-boiling solvent; (II) the (meth)acrylic acid is separated from the quenched reaction gas by absorption in the high-boiling solvent; (III) the solvent loaded with (meth)acrylic acid is split into a first partial flow (IIIA) mostly containing (meth)acrylic acid and a second partial flow (IIIB) mostly containing the solvent; (IV) flow (IIIB) is sent back to step (II); and (V) (meth)acrylic acid is extracted from flow (IIIA) by distillation, all remaining liquid flows produced in step (V) being sent back to step (I).

THERMAL SEPARATION AND SEPARATION COLON

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Separation of (meth) acrylic acid from the reaction gas mixture formed in the catalytic gas phase oxidation of C3/C4 compounds

Verfahren zur reinigung von bodenkolonnen, die zur rektifikativen behandlung von (meth) acrylsäure und/oder deren ester enthaltenden flüssigkeiten verwendet worden waren

Method for the production of alkyl glucosides, especially alkyl fructosides

Thermisches trennverfahren und trennkolonne

Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden

Verfahren zur herstellung von alkylglycosiden, insbesondere alkylfructosiden

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Alkylglycosiden aus Sacchariden, die Fructose in nichtreduzierender Form enthalten, durch säurekatalysierte Umsetzung von Alkohol mit den Sacchariden, wobei als Katalysator mindestens einer ausgewählt unter einem Tonmineral, einem Y-Zeolithen und Oxalsäure verwendet wird und die Produktmischung die entsprechenden Alkylfructoside enthält, und ggf. die erhaltenen Alkylglycoside mit einem weiteren, insbesondere höheren Alkohol transglycosidiert werden können.

Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden

Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden

Method for the continuous extraction of (meth)acrylic acid

Bis-(4-hydroxy-3,5-dialkylbenzyl) -carbonsäureester, deren Herstellung und Verwendung zum Stabilisieren von Polymeren