Oxidative dehydrogenation process with hydrocarbon moderator gas and reduced nitrogen feed

Oxidative dehydrogenation includes: (a) providing a gaseous feed stream to a catalytic reactor, the feed stream comprising a dehydrogenation reactant, oxygen, superheated steam, hydrocarbon moderator gas and optionally nitrogen, wherein the molar ratio of moderator gas to oxygen in feed stream is typically from 4:1 to 1:1 and the molar ratio of oxygen to nitrogen in the feed stream is at least 2; (b) oxidatively dehydrogenating the reactant in the reactor to provide a dehydrogenated product enriched effluent product stream; and (c) recovering dehydrogenated product from the effluent product stream. One preferred embodiment is a process for making butadiene including dimerizing ethylene to n-butene in a homogeneous reaction medium to provide a hydrocarbonaceous n-butene rich feed stream and oxidatively dehydrogenating the n-butene so formed.

High Throughput Oxidative Dehydrogenation Process

A method of oxidatively dehydrogenating a n-butenes to butadiene includes oxidatively dehydrogenating dehydrogenation reactant in a first adiabatic, catalytic reaction zone to provide a first-stage effluent stream enriched in butadiene at a first-stage effluent temperature above the first-stage inlet temperature, cooling the first-stage effluent stream in a first heat transfer zone to a second-stage inlet temperature lower than said first-stage effluent temperature to provide a second gaseous feed stream comprising superheated steam, n-butene and butadiene, wherein the second stage inlet temperature is lower than said first stage effluent temperature and oxidatively dehydrogenating n-butene in the second stream to provide a product stream further enriched in butadiene at a second stage effluent temperature above said second-stage inlet temperature. The first reaction zone temperature rise and the second reaction zone temperature rise are at least 200° F. (111° C.) and the first heat transfer zone temperature reduction is at least 50% of the value of the first reaction zone temperature rise. 2. The method according to claim 1 , wherein said first reaction zone temperature rise and said second reaction zone temperature rise are at least 250° F. (139° C.).3. The method according to claim 1 , wherein said first reaction zone temperature rise and said second reaction zone temperature rise are at least 350° F. (194° C.).4. The method according to claim 1 , wherein said first reaction zone temperature rise and said second reaction zone temperature rise are from 275° F. (153° C.) to 400° F. (222° C.).5. The method according to claim 1 , wherein the first reaction zone temperature rise or the second reaction zone temperature rise are from 275° F. (153° C.) to 400° F. (222° C.).6. The method according to claim 1 , wherein said first-stage effluent temperature and said second stage effluent temperature are less than 1200° F. (667° C.).7. The method according to claim 1 , ...

Regeneration of oxidative dehydrogenation catalyst in a reactor

Disclosed herein is a process for the regeneration of oxidative dehydrogenation (OXO-D) catalyst in an alternate or separate regeneration reactor by employing controlled steam:air and time/pressure/temperature conditions. The process avoids destruction of the catalyst, and wear/tear on an OXO-D reactor. The regenerated catalyst is an iron based oxide catalyst which can be zinc or zinc-free. The iron based oxide catalyst is regenerated in the regeneration reactor by feeding an air/steam stream over a set amount of time, preferably about 6 days to yield a regenerated OXO-D catalyst. The regenerated catalyst is activated and re-utilized to produce butadienes.

CATALYST FOR REDUCED NITROGEN OXIDE (NOx) EMISSIONS IN AN OXODEHYDROGENATION PROCESS

The present invention discloses a process to treat a ferrite based catalyst useful in the oxidative dehydrogenation of monololefins and diolefins which process includes a preheat step prior to use of the catalyst in the OXO-D reactor. The catalyst is preferably a zinc ferrite catalyst for the production of butadiene. It has been observed that substantially no nitrogen oxide emissions result from the use of this treated catalyst in the reactor unit during the oxidative dehydrogenation reaction.

Oxidative Dehydrogenation Process With Hydrocarbon Moderator Gas and Reduced Nitrogen Feed

Oxidative dehydrogenation includes: (a) providing a gaseous feed stream to a catalytic reactor, the feed stream comprising a dehydrogenation reactant, oxygen, superheated steam, hydrocarbon moderator gas and optionally nitrogen, wherein the molar ratio of moderator gas to oxygen in feed stream is typically from 4:1 to 1:1 and the molar ratio of oxygen to nitrogen in the feed stream is at least 2; (b) oxidatively dehydrogenating the reactant in the reactor to provide a dehydrogenated product enriched effluent product stream; and (c) recovering dehydrogenated product from the effluent product stream. One preferred embodiment is a process for making butadiene including dimerizing ethylene to n-butene in a homogeneous reaction medium to provide a hydrocarbonaceous n-butene rich feed stream and oxidatively dehydrogenating the n-butene so formed. 1. A method of oxidatively dehydrogenating a dehydrogenation reactant comprising: 'wherein the molar ratio of hydrocarbon moderator gas to oxygen in the feed stream is from 50:1 to 0.5:1;', '(a) providing a gaseous feed steam to a catalytic reactor, the feed stream comprising a dehydrogenation reactant, oxygen, superheated steam and a hydrocarbon moderator gas,'}(b) oxidatively dehydrogenating the dehydrogenation reactant in the reactor to generate an effluent product stream enriched in a dehydrogenated product derived from said dehydrogenation reactant; and(c) recovering said dehydrogenated product from the effluent product stream.23-. (canceled)4. The method according to claim 1 , wherein the molar ratio of hydrocarbon moderator gas to oxygen in the feed stream is from 8:1 to 0.5:1.5. (canceled)6. The method according to claim 1 , wherein the molar ratio of hydrocarbon moderator gas to oxygen in the feed stream is from 3:1 to 1.5:1.7. The method according to claim 1 , wherein the feed stream optionally comprises nitrogen and the molar ratio of oxygen:nitrogen in the feed stream is at least 0.5.8. The method according to claim 4 ...

Multi-Stage Oxidative Dehydrogenation Process with Inter-Stage Cooling

A method of oxidatively dehydrogenating a dehydrogenation reactant includes providing a first gaseous feed stream to a first adiabatic, catalytic reaction zone with less than a stoichiometric amount of oxygen and superheated steam, oxidatively dehydrogenating dehydrogenation reactant in said first adiabatic, catalytic reaction zone and subsequently cooling the effluent, adding additional oxygen and reacting the effluent stream in at least one subsequent adiabatic reaction zone. The deydrogenation system enables higher conversion and yield per pass and in some cases greatly reduces steam usage and energy costs. In a preferred integrated process, ethylene is converted to n-butene which is then oxidatively dehydrogenated to butadiene.

Regeneration of oxidative dehydrogenation catalyst in a reactor

Disclosed herein is a process for the regeneration of oxidative dehydrogenation (OXO-D) catalyst in an alternate or separate regeneration reactor by employing controlled steam: air and time/pressure/temperature conditions. The process avoids destruction of the catalyst, and wear/tear on an OXO-D reactor. The regenerated catalyst is an iron based oxide catalyst which can be zinc or zinc-free. The iron based oxide catalyst is regenerated in the regeneration reactor by feeding an air/steam stream over a set amount of time, preferably about 6 days to yield a regenerated OXO-D catalyst. The regenerated catalyst is activated and re-utilized to produce butadienes.

HEAT RECOVERY IN THE PROCESS OF PRODUCTION OF BUTADIENE

The process to recover heat in oxidative dehydrogenation of butene to butadiene is presented. The process utilizes heat recovered in oxidative dehydrogenation of butene to butadiene to generate steam. The process utilizes the circulated water stream generated in oxidative dehydrogenation of butene to butadiene for steam generation. A feedstream comprising butene is mixed with steam and preheated air at the inlet of the oxidative dehydrogenation reactor. 2. The process of further comprising passing the generated steam from the disengaging drum to the oxidative dehydrogenation reactor.3. The process of further comprising mixing the feedstream comprising butene with the steam and superheating the mixture to a temperature of at least 205° C.4. The process of wherein the product stream is cooled with water from the disengaging drum.5. The process of further comprising passing the product stream to the heat exchanger to vaporize a portion of the circulating water stream and generate steam.6. The process of wherein the circulating water stream is partially vaporized by heat exchange with the product stream comprising butadiene.7. The process of wherein the oxidative dehydrogenation reactor is a two stage reactor with the first stage generating an intermediate stream and passing the intermediate stream to the second stage claim 1 , further comprising heat exchanging the steam with the intermediate stream.8. The process of further comprising superheating the steam.9. The process of further comprising passing the superheated steam to the oxidative dehydrogenation reactor.10. The process of further comprising passing the product stream comprising butadiene to an oxygenate scrubber to generate a scrubbed stream.11. The process of further comprising passing the scrubbed stream to oxygenate stripper to generate a stripped stream and a vapor stream.12. The process of further comprising passing the stripped stream and an absorption oil to a C4 absorber to generate an absorption ...

Use of c4 absorber overhead for stripping aldehydes

A process is presented for the production of butadienes. The process includes the separation of oxygenates from the product stream from an oxidative dehydrogenation reactor. The process includes quenching the product stream and solvent and oxygenates from the product stream. The oxygenates are stripped from the solvent with an inert gas to reduce the energy consumption of the process, and the solvent is recycled and reused in the process.

Use of c4 absorber for stripping aldehydes

A process is presented for the production of butadienes. The process includes the separation of oxygenates from the product stream from an oxidative dehydrogenation reactor. The process includes quenching the product stream and solvent and oxygenates from the product stream. The oxygenates are stripped from the solvent with an inert gas to reduce the energy consumption of the process, and the solvent is recycled and reused in the process.

High throughput oxidative dehydrogenation process

A method of oxidatively dehydrogenating a n-butenes to butadiene includes oxidatively dehydrogenating dehydrogenation reactant in a first adiabatic, catalytic reaction zone to provide a first-stage effluent stream enriched in butadiene at a first-stage effluent temperature above the first-stage inlet temperature, cooling the first-stage effluent stream in a first heat transfer zone to a second-stage inlet temperature lower than said first-stage effluent temperature to provide a second gaseous feed stream comprising superheated steam, n-butene and butadiene, wherein the second stage inlet temperature is lower than said first stage effluent temperature and oxidatively dehydrogenating n-butene in the second stream to provide a product stream further enriched in butadiene at a second stage effluent temperature above said second-stage inlet temperature. The first reaction zone temperature rise and the second reaction zone temperature rise are at least 200° F. (111° C.) and the first heat transfer zone temperature reduction is at least 50% of the value of the first reaction zone temperature rise.

Catalyst for reduced nitrogen oxide (NOx) emissions in an oxodehydrogenation process

The present invention discloses a process to treat a ferrite based catalyst useful in the oxidative dehydrogenation of monololefins and diolefins which process includes a preheat step prior to use of the catalyst in the OXO-D reactor. The catalyst is preferably a zinc ferrite catalyst for the production of butadiene. It has been observed that substantially no nitrogen oxide emissions result from the use of this treated catalyst in the reactor unit during the oxidative dehydrogenation reaction.

Use of c4 absorber for stripping aldehydes