PROCESS FOR PRODUCING ACETIC ACID

Title:

PROCESS FOR PRODUCING ACETIC ACID

Document Type and Number:

WIPO Patent Application WO/2012/081418

Kind Code:

A1

Abstract:

The present invention provides a process in which acetic acid is produced while inhibiting the concentrations of hydrogen iodide and acetic acid from rising in an acetaldehyde distillation tower. The process comprises: a step in which methanol is reacted with carbon monoxide; a step in which the reaction mixture is fed to a flasher and separated into a volatile component (2A) and a lowly volatile component (2B); a step in which the volatile component (2A) is fed to a distillation tower and separated into an overhead fraction (3A) comprising methyl iodide, acetic acid, methyl acetate, water, acetaldehyde, and hydrogen iodide and a fraction (3B) comprising acetic acid, which is recovered; and a separation step in which the condensed overhead fraction (3A) is fed to an acetaldehyde distillation tower and a liquid to be treated which includes the overhead fraction (3A) is separated into a low-boiling component (4A) containing acetaldehyde and a high-boiling component (4B). In the separation step, the liquid to be treated contains methanol and/or dimethyl ether in a concentration of 0.1-50 wt.% and is distilled.

Inventors:

SHIMIZU MASAHIKO (JP)
SAITO RYUJI (JP)
MIURA HIROYUKI (JP)

Application Number:

PCT/JP2011/077846

Publication Date:

June 21, 2012

Filing Date:

December 01, 2011

Export Citation:

Click for automatic bibliography generation Help

Assignee:

DAICEL CORP (JP)
SHIMIZU MASAHIKO (JP)
SAITO RYUJI (JP)
MIURA HIROYUKI (JP)

International Classes:

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

Foreign References:

JP2000072712A	2000-03-07
JP2005289936A	2005-10-20
JP2005515227A	2005-05-26
JPH0867650A	1996-03-12

Other References: