Production method for alkene

Patent metadata

Field	Value
Publication number	US-2021047252-A1
Application number	US-201816978861-A
Country	US
Kind code	A1
Filing date	Oct 18, 2018
Priority date	Mar 14, 2018
Publication date	Feb 18, 2021
Grant date	—

Abstract

The present invention is to provide a method of producing an alkene that can further enhance the yield of an alkene, a reaction product, the method including bringing a gaseous halogenated alkane into contact with an alkaline aqueous solution in the presence of a phase-transfer catalyst. The objective above is achieved by a method of producing an alkene comprising bringing in the presence of a phase-transfer catalyst a liquid phase containing an alkaline aqueous solution and a water-insoluble solvent into contact with a gas phase containing a halogenated alkane that is soluble in the water-insoluble solvent.

First claim

1 . A method of producing an alkene, the method comprising bringing in the presence of a phase-transfer catalyst a liquid phase containing an alkaline aqueous solution and a water-insoluble solvent into contact with a gas phase containing a halogenated alkane that is soluble in the water-insoluble solvent and is represented by General Formula (1), and eliminating hydrogen chloride:

where, R1 represents a chlorine atom, R2 represents a hydrogen atom, a halogen atom that is the same type as R1, or a halogen atom having a bond dissociation energy with a carbon atom greater than that of the atom represented by R1, R3 represents a halogen atom that is the same type as R1, a halogen atom having a bond dissociation energy with a carbon atom greater than that of the atom represented by R1, or an alkane group having from 1 to 3 carbons which may be substituted with any halogen atom.

2 . The method of producing an alkene according to claim 1 , wherein the liquid phase is agitated in the step of bringing the liquid phase into contact with the gas phase.

3 . The method of producing an alkene according to claim 1 , wherein the step of bringing the liquid phase into contact with the gas phase is a step of producing the alkene in a gas form, which is a reaction product.

4 . The method of producing an alkene according to claim 1 , wherein the water-insoluble solvent is a water-insoluble solvent selected from a group consisting of an alcohol-based water-insoluble solvent, an ether-based water-insoluble solvent, an aliphatic hydrocarbon-based water-insoluble solvent, and an aromatic hydrocarbon-based water-insoluble solvent.

5 . The method of producing an alkene according to claim 1 , wherein the water-insoluble solvent is a water-insoluble solvent selected from a group consisting of toluene, isopropylbenzene, and o-dichlorobenzene.

6 . (canceled)

7 . (canceled)

8 . The method of producing an alkene according to claim 1 , wherein the halogenated alkane is 1,1-difluoro-1-chloroethane, and the step of bringing the liquid phase into contact with the gas phase is a step of producing 1,1 -difluoroethylene.

Assignees

• Kureha Corp

Inventors

• Suzuki Kensuke
• Tohmiya Hiraku

Classifications

• B01J2531/985

  in a water / organic solvent system · CPC title

• B01J31/0239 Primary

  Quaternary ammonium compounds · CPC title

• C07C17/25 Primary

  by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title

• B01J2531/98

  Phase-transfer catalysis in a mixed solvent system containing at least 2 immiscible solvents or solvent phases · CPC title

• C07B61/00

  Other general methods · CPC title