ACETIC ACID PRODUCTION METHOD

Title:

ACETIC ACID PRODUCTION METHOD

Document Type and Number:

WIPO Patent Application WO/2018/135015

Kind Code:

A1

Abstract:

Provided is a method whereby corrosion of a distillation device can be suppressed in an acetic acid production method including a step in which a crude acetic acid solution including acetic acid and impurities having a higher boiling point than acetic acid is distilled and the acetic acid is purified. This acetic acid production method includes a step in which a crude acetic acid solution including acetic acid and impurities having a higher boiling point than acetic acid is distilled and acetic acid is purified. The production method is characterized by the distillation of the crude acetic acid solution occurring in conditions whereby the tower floor temperature of a distillation tower is no more than 165°C. Ideally, the acetic acid concentration in the crude acetic acid solution to be distilled is at least 90% by mass. Impurities having a higher boiling point than acetic acid include acetate, acetic anhydride, and propionic acid. Ideally the tower floor pressure in the distillation tower is less than 0.255 MPaG.

Inventors:

SHIMIZU MASAHIKO (JP)
MIZUTANI YOSHIHISA (JP)

Application Number:

PCT/JP2017/019574

Publication Date:

July 26, 2018

Filing Date:

May 25, 2017

Export Citation:

Click for automatic bibliography generation Help

Assignee:

DAICEL CORP (JP)

International Classes:

C07C51/44; C07C53/08

Domestic Patent References:

WO2012086386A1	2012-06-28
WO2013137236A1	2013-09-19
WO2010077261A1	2010-07-08
WO2016194850A1	2016-12-08
WO2017057085A1	2017-04-06
WO2017057142A1	2017-04-06

Foreign References:

JPS5217413A	1977-02-09
JPS4861414A	1973-08-28
JP2000053609A	2000-02-22
JP2014500255A	2014-01-09
JP2005289936A	2005-10-20
JP2001508405A	2001-06-26
JP2007526305A	2007-09-13
JP2007526306A	2007-09-13
JP2007526310A	2007-09-13
JP2006182691A	2006-07-13

Other References: