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    METHOD FOR PRODUCING PURIFIED ACETIC ACID
    6.
    发明公开
    METHOD FOR PRODUCING PURIFIED ACETIC ACID 审中-公开

    公开(公告)号：EP4129968A1

    公开(公告)日：2023-02-08

    申请号：EP21780111.7

    申请日：2021-03-29

    Applicant: Daicel Corporation

    Inventor： TAKEDA, Kazuhito ,  FUKUI, Naoyuki ,  DEBA, Miduki

    IPC: C07C51/42 ,  C07C51/44 ,  C07C53/08

    Abstract: Provided is a method for producing purified acetic acid from a mixed solution containing acetic acid, an organic solvent, and water in an energy-efficient manner. The method, which is for producing purified acetic acid from a mixed solution containing acetic acid, an organic solvent, and water, includes: a distillation step in which the mixed solution is distilled and separated into a purified liquid rich in acetic acid and a separated liquid rich in an organic solvent; and a membrane separation step in which the water is separated from the purified liquid by a separation membrane. The purified liquid has a water concentration of 4 wt.% or less.

    ACETIC ACID PRODUCTION METHOD
    7.
    发明公开
    ACETIC ACID PRODUCTION METHOD 审中-公开

    公开(公告)号：EP4026826A1

    公开(公告)日：2022-07-13

    申请号：EP20860891.9

    申请日：2020-09-03

    Applicant: Chiyoda Corporation

    Inventor： MATSUMOTO Tadashi ,  HIRAI Toshihide ,  KOTANI Yui ,  HONDA Daisuke

    IPC: C07C51/44 ,  C07C53/08

    Abstract: Acetic acid is manufactured by a method of carbonylating a raw material with carbon monoxide, the method comprising: a reaction step of forming a reaction mixture containing acetic acid inside a reactor; and a purification step of purifying the reaction mixture to thereby obtain product acetic acid. The purification step includes: a flash evaporation step of separating the reaction mixture into a vapor-phase mixture and a liquid-phase mixture; a first distillation step of distilling the vapor-phase mixture to thereby separate and remove low-boiling point components and obtain crude acetic acid; and a second distillation step of introducing the crude acetic acid into a heavy ends column and distilling the crude acetic acid to thereby purify the crude acetic acid and obtain product acetic acid. In the second distillation step, the low-boiling point components remaining in the crude acetic acid are drawn out from a column top of the heavy ends column, the product acetic acid is drawn out from an intermediate drawing stage of the heavy ends column, and a bottoms liquid surface level in the heavy ends column is controlled by adjusting an amount to be drawn out from the intermediate drawing stage.

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