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1. (WO2018135014) ACETIC ACID PRODUCTION METHOD

Pub. No.:    WO/2018/135014    International Application No.:    PCT/JP2017/019573
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Fri May 26 01:59:59 CEST 2017
IPC: C07C 51/12
C07C 51/44
Applicants: DAICEL CORPORATION
株式会社ダイセル
Inventors: SHIMIZU, Masahiko
清水雅彦
GODA, Susumu
合田晋
MIURA, Hiroyuki
三浦裕幸
Title: ACETIC ACID PRODUCTION METHOD
Abstract:
Provided is an acetic acid production method whereby, in a liquid separation step in which a process stream is separated into an aqueous phase and an organic phase, a byproduct acetaldehyde can be separated and removed in an industrially advantageous manner. The liquid separation step fulfills conditions such as (vi)–(viii) and at least part of the aqueous phase is treated in the acetaldehyde separation and removal step. (vi) The acetaldehyde concentration in the aqueous phase is no more than 28.1% by mass and/or the acetaldehyde concentration in the organic phase is no more than 24.8% by mass. (vii) The temperature during liquid separation is no more than 70°C. (viii) The methyl acetate concentration in the aqueous phase is no more than 12.0% by mass and/or the methyl acetate concentration in the organic phase is no more than 47.6% by mass and/or the sum of the methyl acetate concentration in the aqueous phase and the methyl acetate concentration in the organic phase is no more than 59.6% by mass.