Method for production of conjugated diolefin

Patent metadata

Field	Value
Publication number	US-2015126788-A1
Application number	US-201214383479-A
Country	US
Kind code	A1
Filing date	Mar 13, 2012
Priority date	Mar 13, 2012
Publication date	May 7, 2015
Grant date	—

Abstract

An object of the present invention is to provide a method for production of a high purity conjugated diolefin. The method for production of a conjugated diolefin of the present invention comprises steps of supplying a source gas containing a C4 or higher monoolefin and an oxygen-containing gas into a reactor, bringing a catalyst into contact with the gas mixture, compressing a gas containing a conjugated diolefin produced by an oxidative dehydrogenation reaction to obtain a liquefied gas and rinsing the liquefied gas with water.

First claim

1 . A method for production of a conjugated diolefin comprising steps of supplying a source gas containing a C4 or higher monoolefin and an oxygen-containing gas into a reactor, bringing a catalyst into contact with the gas mixture, compressing a gas containing a conjugated diolefin produced by an oxidative dehydrogenation reaction to obtain a liquefied gas and rinsing the liquefied gas with water.

2 . The method for production of the conjugated diolefin according to claim 1 , further comprising steps of:
cooling the gas containing the conjugated diolefin, and allowing the gas containing the conjugated diolefin to be absorbed in a solvent, followed by stripping the gas containing the conjugated diolefin from the solvent.

3 . The method for production of the conjugated diolefin according to claim 1 comprising the following steps of (1) to (6) in this order:
step (1): a step of supplying a source gas containing a C4 or higher monoolefin and an oxygen-containing gas into a reactor and bringing a catalyst into contact with the gas mixture to obtain a gas containing a conjugated diolefin by an oxidative dehydrogenation reaction,
step (2): a step of cooling the gas containing the conjugated diolefin in a quench column,
step (3): a step of allowing the gas containing the conjugated diolefin to be absorbed in a solvent, subsequently stripping the gas containing the conjugated diolefin from the solvent, followed by compressing the gas to obtain a liquefied gas,
step (4): a step of rinsing the liquefied gas with water,
step (5): a step of removing the water from the liquefied gas, and
step (6): a step of removing a high boiling component from the liquefied gas.

4 . The method for production of the conjugated diolefin according to claim 3 ,
wherein the liquefied gas obtained in the step (3) contains acetaldehyde, and the acetaldehyde is dissolved in the water in the step (4).

5 . The method for production of the conjugated diolefin according to claim 3 , further comprising, before the step (4) and/or after the step (6), a step of:
allowing the liquefied gas to be absorbed in a higher polar solvent than the solvent of the step (3), followed by stripping the gas containing the conjugated diolefin from the higher polar solvent.

6 . The method for production of the conjugated diolefin according to claim 5 , wherein the high polar solvent contains at least one selected from the group consisting of N-alkyl-substituted lower fatty acid amide, a nitrile compound and a heterocyclic compound.

7 . The method for production of the conjugated diolefin according to any one of claims 1 to 6 , wherein the source gas contains n-butene.

Assignees

• Takagaki Kazuhiro
• Yano Hiroyuki
• Asahi Kasei Chemicals Corp

Inventors

• Takagaki Kazuhiro
• Yano Hiroyuki

Classifications

• C07C2523/755

  Nickel · CPC title

• C07C2523/745

  Iron · CPC title

• C07C2523/04

  Alkali metals · CPC title

• C07C2523/02

  of the alkali- or alkaline earth metals or beryllium · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title