Invention Grant
- Patent Title: Method for producing acetic acid
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Application No.: US16334667Application Date: 2018-05-02
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Publication No.: US11773044B2Publication Date: 2023-10-03
- Inventor: Masahiko Shimizu
- Applicant: DAICEL CORPORATION
- Applicant Address: JP Osaka
- Assignee: DAICEL CORPORATION
- Current Assignee: DAICEL CORPORATION
- Current Assignee Address: JP Osaka
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- International Application: PCT/JP2018/017508 2018.05.02
- International Announcement: WO2019/211904A 2019.11.07
- Date entered country: 2019-03-19
- Main IPC: C07C51/12
- IPC: C07C51/12 ; B01J39/04 ; B01J47/02 ; C07C51/44 ; C07C51/47

Abstract:
A method for producing acetic acid can improve the life of a silver-substituted ion exchange resin for removing organic iodine compounds in acetic acid. In a carbonylation process of a methanol method, an acetic acid distillation step has at least one distillation step of carrying out the purification of an acetic acid stream under conditions of a column bottom temperature of a distillation column of less than 175° C., a nickel base alloy or zirconium is used as a material of the distillation column in the distillation step, and as metal ion concentrations in a charging mixture of the distillation column in the distillation step, an iron ion concentration is less than 10,000 ppb by mass, a chromium ion concentration is less than 5,000 ppb by mass, a nickel ion concentration is less than 3,000 ppb by mass, and a molybdenum ion concentration is less than 2,000 ppb by mass.
Public/Granted literature
- US20210221763A1 METHOD FOR PRODUCING ACETIC ACID Public/Granted day:2021-07-22
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