ACETIC ACID PRODUCTION METHOD

Title:

ACETIC ACID PRODUCTION METHOD

Document Type and Number:

WIPO Patent Application WO/2012/046593

Kind Code:

A1

Abstract:

Provided is a method for the stable production of high purity acetic acid while efficiently removing acetaldehyde. The production method includes: a step in which methanol and carbon monoxide are reacted in the presence of a metal catalyst, a halide salt and methyl iodide; a step in which the reaction mixture is continuously supplied to a flasher and separated into a low boiling point component (2A) containing acetic acid and methyl iodide, and a high boiling point component (2B) containing the metal catalyst and the halide salt; a step in which the low boiling point component (2A) is supplied to an evaporation tower and separated into a low boiling point component (3A) containing methyl iodide and acetaldehyde, and a flow (3B) containing acetic acid, and in which the acetic acid is collected; a step in which the low boiling point component (3A) is condensed and temporarily held in a decanter before being discharged; and a step in which the acetaldehyde is separated from the low boiling point component (3A) discharged from the decanter, and the separated fluid is recycled in the reaction system. The amount of the low boiling point component (3A) held in the condensation step is regulated on the basis of fluctuations in the flow rate of the low boiling point component (3A) supplied to the decanter.

Inventors:

SHIMIZU MASAHIKO (JP)

Application Number:

PCT/JP2011/072059

Publication Date:

April 12, 2012

Filing Date:

September 27, 2011

Export Citation:

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Assignee:

DAICEL CHEM (JP)
SHIMIZU MASAHIKO (JP)

International Classes:

C07C51/12; C07C51/44; C07C53/08; C07B61/00

Foreign References:

JP2010106045A	2010-05-13
JP2007224040A	2007-09-06
JPH0867650A	1996-03-12
JP2001300203A	2001-10-30
JPS63290835A	1988-11-28
JPS61267533A	1986-11-27

Other References: