Method for inhibiting polymerization of a vinyl compound
    1.
    发明授权
    Method for inhibiting polymerization of a vinyl compound 有权
    抑制乙烯基化合物聚合的方法

    公开(公告)号:US06664418B1

    公开(公告)日:2003-12-16

    申请号:US09361183

    申请日:1999-07-27

    IPC分类号: C07C5718

    CPC分类号: C07B63/04 C07C51/50 C07C57/04

    摘要: A method for inhibiting polymerization during transportation, storage and/or production of (meth)acrylic acid or an ester thereof includes adding an N-oxyl compound and water to a vinyl compound; or dissolving an N-oxyl compound in water and adding the solution to a vinyl compound in a process of recovering, purifying, and/or synthesizing of the vinyl compound. The method can effectively inhibit polymerization of the vinyl compound.

    摘要翻译: 在(甲基)丙烯酸或其酯的运输,储存和/或生产过程中抑制聚合的方法包括向乙烯基化合物中加入N-氧基化合物和水; 或将N-氧基化合物溶解在水中,并在回收,纯化和/或合成乙烯基化合物的过程中将溶液加入到乙烯基化合物中。 该方法可有效抑制乙烯基化合物的聚合。

    Method for producing (meth)acrylic acid
    2.
    发明授权
    Method for producing (meth)acrylic acid 有权
    (甲基)丙烯酸的制造方法

    公开(公告)号:US06888026B2

    公开(公告)日:2005-05-03

    申请号:US10254863

    申请日:2002-09-26

    摘要: An object of this invention is to provide a method for producing acrylic acid that enables to suppress adverse influence of byproducts during distillation and to accomplish long-term continuous operation of the acrylic acid production apparatus. This invention is directed to a method for producing (meth)acrylic acid comprising the step of isolating (meth)acrylic acid from a liquid containing (meth)acrylic acid by distillation wherein the liquid contains glyoxal (including its hydrate) in a concentration of 0.1 mass % or less.

    摘要翻译: 本发明的目的是提供一种丙烯酸的制备方法,其能够抑制蒸馏期间副产物的不利影响并且实现丙烯酸生产装置的长期连续操作。 本发明涉及一种生产(甲基)丙烯酸的方法,其包括通过蒸馏从含(甲基)丙烯酸的液体中分离(甲基)丙烯酸的步骤,其中液体含有浓度为0.1的乙二醛(包括其水合物) 质量%以下。

    Method for preventing polymerization in an acrylic acid manufacturing process
    3.
    发明授权
    Method for preventing polymerization in an acrylic acid manufacturing process 有权
    在丙烯酸​​制造方法中防止聚合的方法

    公开(公告)号:US07005544B2

    公开(公告)日:2006-02-28

    申请号:US10651031

    申请日:2003-08-29

    IPC分类号: C07C51/42

    CPC分类号: C07C51/46 C07C57/04

    摘要: A method for effectively preventing polymerization of acrylic acid during an azeotropic dehydration distillation in an acrylic acid manufacturing process and thus enabling stable operation of the azeotropic dehydration column over an extended period of time. The acrylic acid is separated in an azeotropic dehydration column from an acrylic acid aqueous solution fed therein, and the method includes withdrawing from the bottom of the azeotropie dehydration column a bottom effluent containing 50% or more of glyoxal (including the hydrates thereof) contained in the acrylic acid aqueous solution fed into the azeotropic dehydration column.

    摘要翻译: 一种在丙烯酸制造过程中共沸脱水中有效防止丙烯酸聚合的方法,从而使得能够在长时间内稳定地操作共沸脱水塔。 丙烯酸在共沸脱水塔中从进料的丙烯酸水溶液中分离出来,该方法包括从共沸脱水塔的底部排出含有50%或更多乙二醛(包括其水合物)的底部流出物, 丙烯酸水溶液加入共沸脱水塔中。