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    Method for producing vinyl acetate
    1.
    发明授权
    Method for producing vinyl acetate 有权

    公开(公告)号：US11939286B2

    公开(公告)日：2024-03-26

    申请号：US18023300

    申请日：2021-09-23

    申请人： TIANJIN UNIVERSITY

    发明人： Minhua Zhang ,  Zhongfeng Geng ,  He Dong ,  Hao Gong ,  Yingzhe Yu ,  Shenghua Qian ,  Xiuqin Dong

    IPC分类号： C07C67/05 ,  C07C67/48 ,  C07C67/54 ,  C07C69/15

    CPC分类号： C07C67/05 ,  C07C67/48 ,  C07C67/54 ,  C07C69/15

    摘要： The present disclosure relates to a method for producing vinyl acetate, comprising a vinyl acetate synthesis process, a vinyl acetate refining process and a separation process of vinyl acetate and ethyl acetate, including an acetic acid evaporator, an oxygen mixer, a vinyl acetate synthesis reactor, a first gas separating tower, a second gas separating tower, a recovered gas compressor, a water washing tower, an absorption tower and a desorption tower, a recycling gas compressor; the vinyl acetate refining process comprising an acetic acid tower, a crude VAC tower, and a fine VAC tower, a rectifying tower, an ethyl acetate tower, a water phase receiving tank, an extracting and rectifying tower and an ethyl acetate phase separator.

    BATCH PREPARATION METHOD OF ESTER-BASED MATERIAL
    2.
    发明公开
    BATCH PREPARATION METHOD OF ESTER-BASED MATERIAL 审中-公开

    公开(公告)号：US20230303475A1

    公开(公告)日：2023-09-28

    申请号：US18015640

    申请日：2021-09-17

    申请人： LG CHEM, LTD.

    发明人： Hyun Kyu KIM ,  Jeong Ju MOON ,  Eun Suk KIM ,  Yun Gon HEO

    IPC分类号： C07C67/08 ,  C07C67/48

    CPC分类号： C07C67/08 ,  C07C67/48

    摘要： The present invention provides a method for preparing an ester-based material, the method including a step in which in a batch reactor, under a catalyst, at least one polycarboxylic acid selected from the group consisting of a terephthalic acid, a phthalic acid, an isophthalic acid, a cyclohexane dicarboxylic acid, a cyclohexane tricarboxylic acid, a trimellitic acid, and citric acid reacts with at least one mono-alcohol having 3 to 12 alkyl carbon atoms, wherein pressure in the reactor is configured such that the pressure at the early stage is 0.3 barg to 1.0 barg and the pressure at the latter stage is 0 barg to 0.5 barg, the pressure at the early stage being greater than the pressure at the latter stage, and the early and latter stages are divided based on any one of the time points when reaction conversion rate is 30% to 90%.

    Method for producing polyunsaturated fatty acid-containing composition
    6.
    发明授权
    Method for producing polyunsaturated fatty acid-containing composition 有权

    公开(公告)号：US10597607B2

    公开(公告)日：2020-03-24

    申请号：US16098339

    申请日：2017-05-01

    申请人： NISSHIN PHARMA INC.

    发明人： Masataka Harata ,  Shingo Nonaka ,  Hideki Kanai ,  Hiroyuki Ikemoto ,  Kenji Takemoto

    IPC分类号： C11C1/08 ,  C07C67/48 ,  C11B7/00 ,  C12M1/00

    摘要： Provided is a method for producing a polyunsaturated fatty acid while preventing deterioration of a silver salt solution. A method for producing a composition comprising a polyunsaturated fatty acid, comprising: supplying an aqueous solution comprising a silver salt into a reaction vessel to contact the aqueous solution with a raw material solution comprising an alkyl ester of the polyunsaturated fatty acid; and collecting the aqueous solution comprising the silver salt which has been contacted with the raw material solution from the reaction vessel, wherein the supply of the aqueous solution comprising the silver salt into the reaction vessel and the collection of the aqueous solution comprising the silver salt from the reaction vessel are carried out concurrently with each other.