Method of immediately terminating free-radical polymerisation processes
    4.
    发明授权
    Method of immediately terminating free-radical polymerisation processes 有权
    立即终止自由基聚合方法的方法

    公开(公告)号:US06518374B1

    公开(公告)日:2003-02-11

    申请号:US09926417

    申请日:2001-10-29

    IPC分类号: C08F238

    CPC分类号: C08F2/42

    摘要: Free radical polymerizations immediately terminated by a process comprising the addition of an inhibitor solution which contains phenothiazine and at least 50% (w/w) N-alkylpyrrolidone to a system undergoing free radical polymerization, wherein the inhibitor solution also contains p-methoxyphenol (MEHQ).

    摘要翻译: 通过包括向含有吩噻嗪和至少50%(w / w)N-烷基吡咯烷酮的抑制剂溶液加入到经历自由基聚合的体系中的方法立即终止自由基聚合,其中抑制剂溶液还含有对甲氧基苯酚(MEHQ )。

    Method for producing acrylic acid
    5.
    发明授权
    Method for producing acrylic acid 有权
    制备丙烯酸的方法

    公开(公告)号:US06498272B1

    公开(公告)日:2002-12-24

    申请号:US09914533

    申请日:2001-08-30

    IPC分类号: C07C5142

    摘要: In a process for the preparation of acrylic acid, a product gas mixture obtained by catalytic gas-phase oxidation of a C3-precursor of acrylic acid and containing acrylic acid is directly cooled with a quench liquid and then subjected to fractional condensation in a separation column provided with baffles, said product gas mixture ascending into itself and a crude acrylic acid being removed via a side take-off, and the acrylic acid oligomers formed are cleaved and recycled.

    摘要翻译: 在制备丙烯酸的方法中,通过丙烯酸的C3-前体和含丙烯酸的催化气相氧化获得的产物气体混合物用骤冷液直接冷却,然后在分离塔中进行分级冷凝 设置有挡板,所述产物气体混合物自身上升,粗丙烯酸通过侧移除去,形成的丙烯酸低聚物被切割和再循环。

    Method for producing (meth)acrylic acid esters
    7.
    发明授权
    Method for producing (meth)acrylic acid esters 有权
    (甲基)丙烯酸酯的制造方法

    公开(公告)号:US07026503B2

    公开(公告)日:2006-04-11

    申请号:US10478695

    申请日:2002-05-28

    IPC分类号: C07C67/02

    摘要: Higher (meth)acrylates IV are prepared by transesterification of a lower (meth)acrylate I with a higher alcohol R2OH in the presence of a stabilizer or stabilizer mixture and of a catalyst or catalyst mixture, by a process in which the liberated lower alkanol R1OH is separated off and is fed at least partly to the preparation of the lower (meth)acrylate I.

    摘要翻译: 通过在稳定剂或稳定剂混合物和催化剂或催化剂混合物的存在下,通过下式(甲基)丙烯酸酯I与高级醇R 2 OH在低级(甲基)丙烯酸酯I与催化剂或催化剂混合物的存在下, 释放的低级链烷醇R 1 H 2 OH的方法被分离出并且至少部分地供给到下(甲基)丙烯酸酯I的制备中。

    Preparation of polymerizable compounds
    9.
    发明授权
    Preparation of polymerizable compounds 有权
    可聚合化合物的制备

    公开(公告)号:US06818792B2

    公开(公告)日:2004-11-16

    申请号:US10233567

    申请日:2002-09-04

    IPC分类号: C07C6748

    CPC分类号: B01D3/10

    摘要: Polymerizable compounds are prepared and/or worked up using at least one liquid ring pump by a process in which a working liquid which contains a material stream from the preparation and/or working-up of the polymerizable compound is used in a liquid ring pump.

    摘要翻译: 通过在液环泵中使用含有来自可聚合化合物的制备和/或后处理的材料流的工作液体的方法,使用至少一个液环泵来制备和/或处理可聚合化合物。

    Method for producing acrylic acid and acrylic acid esters
    10.
    发明授权
    Method for producing acrylic acid and acrylic acid esters 有权
    制备丙烯酸和丙烯酸酯的方法

    公开(公告)号:US06727383B1

    公开(公告)日:2004-04-27

    申请号:US09647561

    申请日:2000-10-02

    IPC分类号: C07C5142

    摘要: A process for preparing acrylic acid and/or acrylates which comprises the following stage A and, if desired, B and C: A: cooling a gaseous reaction mixture which comprises acrylic acid and is obtained in the gas-phase oxidation to prepare acrylic acid, using oligomeric acrylic acid or a mixture of acrylic acid and oligomeric acrylic acid, to give a gaseous mixture comprising acrylic acid and a quench bottom product which comprises oligomeric acrylic acid; B: separating the gaseous mixture comprising acrylic acid, to give a low-boiling fraction, a crude acrylic acid, and a bottom product, which comprises oligomeric acrylic acid; C: esterifying the crude acrylic acid obtained in stage B by means of one or more alkanols.

    摘要翻译: 一种制备丙烯酸和/或丙烯酸酯的方法,其包括以下阶段A以及如果需要,B和C:A:冷却包含丙烯酸并在气相氧化中获得的气态反应混合物以制备丙烯酸, 使用低聚丙烯酸或丙烯酸和低聚丙烯酸的混合物,得到包含丙烯酸和骤冷底部产物的气体混合物,其包含低聚丙烯酸; B:将包含丙烯酸的气态混合物分离,得到低沸点 馏分,粗丙烯酸和底部产物,其包含低聚丙烯酸; C:通过一种或多种链烷醇酯化在阶段B中获得的粗丙烯酸。