Title:
ACETIC ACID PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/179457
Kind Code:
A1
Abstract:
Provided is a method capable of efficient industrial production of high quality acetic acid with good potassium permanganate test value and low impurity content, without incurring enormous cost. This acetic acid production method comprises a carbonylation reaction step, a vaporization step and a low boiling point substance removal step. In addition to heating a vaporization tank to cause (i) the acetaldehyde concentration in the aqueous phase of a condensed overhead liquid from a low-boiling-point substance-removal column to be at least 2340 mass ppm and/or (ii) the methyl acetate concentration in the aqueous phase to be less than 19.0 mass% and/or (iii) the methyl acetate concentration in the organic phase of the condensed overhead liquid of the low-boiling-point substance-removal column to be less than 38.0 mass%, at least a portion of said aqueous phase is treated in an acetaldehyde separation and removal step and the residual liquid after the acetaldehyde separation and removal is recycled to the reaction tank and/or the acetaldehyde separation and removal step and/or another process.
Inventors:
SHIMIZU MASAHIKO (JP)
Application Number:
PCT/JP2017/019579
Publication Date:
October 04, 2018
Filing Date:
May 25, 2017
Export Citation:
Assignee:
DAICEL CORP (JP)
International Classes:
C07C51/44; C07B61/00; C07C51/12; C07C53/08
Domestic Patent References:
| WO2016194850A1 | 2016-12-08 | |||
| WO2014097867A1 | 2014-06-26 | |||
| WO2013137236A1 | 2013-09-19 | |||
| WO2012081418A1 | 2012-06-21 | |||
| WO2009134333A1 | 2009-11-05 | |||
| WO2009042078A1 | 2009-04-02 | |||
| WO2011146446A1 | 2011-11-24 | |||
| WO2016076968A1 | 2016-05-19 | |||
| WO2016126292A1 | 2016-08-11 |
Foreign References:
| JP2011518880A | 2011-06-30 | |||
| JPH0725813A | 1995-01-27 | |||
| JP2001508405A | 2001-06-26 |
Other References:
See also references of EP 3401303A4
Attorney, Agent or Firm:
GOTO & CO. (JP)
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