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    Ethyl acetate removal during VAM production
    2.
    发明授权
    Ethyl acetate removal during VAM production 有权

    公开(公告)号：US11254636B2

    公开(公告)日：2022-02-22

    申请号：US16984975

    申请日：2020-08-04

    申请人： LyondellBasell Acetyls, LLC

    发明人： Linn Fang ,  Chuc T. Nguyen

    IPC分类号： C07C67/54 ,  B01D3/42 ,  C07C69/15

    摘要： Purification methods and systems for working up a crude vinyl acetate stream containing vinyl acetate monomer, acetic acid, water, ethyl acetate, and other impurities. Crude vinyl acetate streams are purified with an azeotropic distillation tower using a side draw to remove ethyl acetate and water, and a bottom stream to remove acetic acid from the crude vinyl acetate. The methods and systems move the side draw to a location on the azeotropic distillation tower that maintains a constant water concentration in the bottom product of about 4 to about 15 wt. % and forms a vapor side product. A second distillation tower is used to further purify the vapor side product to obtain water, VAM, ethyl acetate and AA. The system provides easier disposal of ethyl acetate, and cleaner water that can be recycled in the reactor or purification sections of a VAM plant and full recovery of AA.

    Integrated process for the manufacture of alkenyl carboxylates
    9.
    发明申请
    Integrated process for the manufacture of alkenyl carboxylates 失效
    用于制备链烯基羧酸盐的综合方法

    公开(公告)号：US20050020847A1

    公开(公告)日：2005-01-27

    申请号：US10500305

    申请日：2002-12-04

    申请人： Robert Clarke ,  Mark Roberts

    发明人： Robert Clarke ,  Mark Roberts

    IPC分类号： C07C67/05 ,  C07B61/00 ,  C07C51/215 ,  C07C53/08 ,  C07C67/00 ,  C07C67/54 ,  C07C69/01 ,  C07C69/15

    CPC分类号： C07C67/54 ,  C07C5/48 ,  C07C51/215 ,  C07C51/46 ,  C07C67/055 ,  Y02P20/125 ,  Y02P20/582 ,  C07C69/15 ,  C07C53/08 ,  C07C11/04

    摘要： An integrated process for the production of an alkenyl carboxylate, such as vinyl acetate which process comprises the steps of (a) contacting in an oxidation reaction zone a C2 to C4 alkane, such as ethane, a molecular oxygen-containing gas, optionally the corresponding alkene and optionally water, in the presence of a catalyst to produce a stream comprising alkene, carboxylic acid and water; (b) separating at least a portion of the stream from step (a) into a fraction comprising the alkene and a fraction comprising the carboxylic acid and water; (c) contacting in a second reaction zone at least a portion of said alkene fraction produced in step (b), a carboxylic acid and a molecular oxygen-containing gas, in the presence of a catalyst to produce a product stream comprising an alkenyl carboxylate, water and carboxylic acid; (d) separating at least a portion of the product stream from step (c) and at least a portion of the carboxylic acid and water fraction produced in step (b) by azeotropic distillation into an overhead fraction comprising the alkenyl carboxylate and a base fraction comprising the carboxylic acid; (e) recovering the alkenyl carboxylate from the overhead fraction separated in step (d).

    摘要翻译： 一种用于生产烯基羧酸酯如乙酸乙烯酯的整合方法，其方法包括以下步骤：（a）在氧化反应区中使C2至C4烷烃如乙烷，含分子氧的气体，任选相应的 烯烃和任选的水，在催化剂的存在下，产生包含烯烃，羧酸和水的流; （b）将来自步骤（a）的物流的至少一部分分离成包含烯烃的馏分和包含羧酸和水的级分; （c）在第二反应区中在催化剂存在下使步骤（b）中产生的所述烯烃馏分的至少一部分与羧酸和含分子氧的气体接触以产生包含链烯基羧酸酯的产物流 ，水和羧酸; （d）通过共沸蒸馏将步骤（c）中的产物流的至少一部分和步骤（b）中产生的羧酸和水部分的至少一部分分离成包含烯基羧酸酯和碱部分的塔顶馏分 包含羧酸; （e）从步骤（d）中分离的塔顶馏分回收烯基羧酸酯。