Continuous recovery of (meth)acrylic acid
    1.
    发明授权
    Continuous recovery of (meth)acrylic acid 失效
    连续回收(甲基)丙烯酸

    公开(公告)号:US06413379B1

    公开(公告)日:2002-07-02

    申请号:US09362911

    申请日:1999-07-29

    IPC分类号: B01D334

    摘要: A process for the continuous recovery of (meth)acrylic acid from a liquid starting mixture containing (meth)acrylic acid, a high-boiling organic solvent and low boilers, medium boilers and high boilers is proposed, the mixture being separated into a first part-stream (a), which, in addition to (meth)acrylic acid, contains the low boilers and a part each of the medium boilers and high boilers, and a second part-stream (b), which contains the predominant part of the (meth)acrylic acid and is completely or virtually completely free of low boilers, and the (meth)acrylic acid being recovered from the part-stream (b).

    摘要翻译: 提出了从含有(甲基)丙烯酸,高沸点有机溶剂和低沸点,中等锅炉和高锅炉的液体起始混合物连续回收(甲基)丙烯酸的方法,将混合物分离成第一部分 流(a),除了(甲基)丙烯酸之外,其还包含低锅炉和中等锅炉和高锅炉的一部分,以及第二部分物流(b),其包含主要部分 (甲基)丙烯酸,完全或几乎完全不含低沸点物质,(甲基)丙烯酸从部分物流(b)回收。

    Method for producing acrylic acid and acrylic acid esters
    7.
    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。

    Method for the production of water-absorbing polymer particles
    8.
    发明授权
    Method for the production of water-absorbing polymer particles 有权
    生产吸水性聚合物颗粒的方法

    公开(公告)号:US08608096B2

    公开(公告)日:2013-12-17

    申请号:US13148854

    申请日:2010-02-15

    IPC分类号: B02C19/00

    CPC分类号: B07B1/28 B07B1/54 C08F6/02

    摘要: A process for producing water-absorbing polymer particles, comprising classification by means of a tumbler screening machine, wherein the tumbler screening machine used for classification is equipped with at least one ball knock cleaning system and entrained balls are removed outside the tumbler screening machine by means of a capture device.

    摘要翻译: 一种吸水性聚合物颗粒的制造方法,其特征在于,包括通过滚筒筛分机进行分级的方法,其中用于分级的滚筒筛分机装备有至少一个球敲击清洗系统,夹带的球通过装置 的捕获设备。