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    Method for producing (meth)acrylic acid and (meth)acrylic acid esters
    4.
    发明授权
    Method for producing (meth)acrylic acid and (meth)acrylic acid esters 有权
    （甲基）丙烯酸和（甲基）丙烯酸酯的制备方法

    公开(公告)号：US06458989B1

    公开(公告)日：2002-10-01

    申请号：US09646126

    申请日：2000-09-28

    申请人： Heinrich Aichinger ,  Hans Martan ,  Gerhard Nestler

    发明人： Heinrich Aichinger ,  Hans Martan ,  Gerhard Nestler

    IPC分类号： C07C6748

    CPC分类号： C07C51/50 ,  B01D3/225 ,  C07C51/44 ,  C07C51/487 ,  C07C67/08 ,  C07C57/04 ,  C07C69/54

    摘要： A process for preparing pure (meth)acrylic acid or a (meth)acrylate starting from a crude (meth)acrylic acid, which comprises the following stages: A: treating the crude (meth)acrylic acid with at least one compound which is able to remove aldehydes, to give an aldehyde-free crude (meth)acrylic acid; B: subjecting the aldehyde-free crude (meth)acrylic acid to imprecise distillation, to give a low-boiling fraction comprising (meth)acrylic acid and acetic acid and a high-boiling fraction comprising (meth)acrylic acid and high boilers; C: isolating a pure (meth)acrylic acid from the high-boiling fraction and, if desired, D: esterifying the low-boiling fraction comprising (meth)acrylic acid and acetic acid that is obtained in stage B by means of one or more alkanols, to give an esterification mixture comprising one or more (meth)acrylates, one or more acetic esters, and one or more alkanols.

    摘要翻译： 一种从粗（甲基）丙烯酸开始制备纯（甲基）丙烯酸或（甲基）丙烯酸）的方法，其包括以下阶段：A：用至少一种能够 去除醛，得到无醛的粗（甲基）丙烯酸; B：使无醛粗（甲基）丙烯酸不精确地进行蒸馏，得到包含（甲基）丙烯酸和乙酸的低沸点馏分 以及包含（甲基）丙烯酸和高沸点剂的高沸点馏分; C：从高沸点馏分中分离出纯的（甲基）丙烯酸，如果需要，D：酯化包含（甲基）丙烯酸的低沸点馏分 通过一种或多种链烷醇在阶段B中获得的酸和乙酸，得到包含一种或多种（甲基）丙烯酸酯，一种或多种乙酸酯和一种或多种链烷醇的酯化混合物。

    Process for preparing alkyl esters of (meth)acrylic acid
    6.
    发明申请
    Process for preparing alkyl esters of (meth)acrylic acid 审中-公开
    制备（甲基）丙烯酸的烷基酯的方法

    公开(公告)号：US20060205973A1

    公开(公告)日：2006-09-14

    申请号：US11358220

    申请日：2006-02-22

    申请人： Thorsten Habeck ,  Ulrich Rauh ,  Thorsten Friese ,  Hans Martan

    发明人： Thorsten Habeck ,  Ulrich Rauh ,  Thorsten Friese ,  Hans Martan

    IPC分类号： C07C67/36

    CPC分类号： C07C67/327 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54

    摘要： A process is described for continuously preparing alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and alkanols having from 1 to 5 carbon atoms in homogeneous, liquid, solvent-free phase at elevated temperature and in the presence of an acidic esterification catalyst, in which the (meth)acrylic acid, the alkanol and the acidic esterification catalyst are fed to a reaction zone (5, 6), a reaction mixture (21) is discharged from the reaction zone (5, 6), and is introduced into a rectification unit I and separated by addition of water into a top stream (23), comprising the alkyl ester of (meth)acrylic acid, and a bottom stream (22), and a substream of the bottom stream (22) from the rectification unit I is fed to a residue dissociation unit IV, which comprises a dissociating boiler (61), and is separated therein into a top stream (29), which is recycled into the rectification unit I and a bottom stream (40), which is removed from the system, wherein the residue dissociation unit IV, as well as the dissociating boiler (61), further comprises a rectification column (62), the water content of the liquid obtained at the bottommost stage thereof being less than 0.1% by weight.

    摘要翻译： 描述了一种通过使（甲基）丙烯酸和具有1至5个碳原子的链烷醇在均相，液体，无溶剂相中在升高的温度和酸性存在下连续制备（甲基）丙烯酸的烷基酯的方法 酯化催化剂，其中将（甲基）丙烯酸，链烷醇和酸性酯化催化剂加入到反应区（5,6）中，将反应混合物（21）从反应区（5,6）排出， 被引入精馏单元I中，并通过加入包含（甲基）丙烯酸的烷基酯和底部流（22））的顶部流（23）和底部流（22）的分流而分离， 来自精馏单元I的残渣解离单元IV包含解离锅炉（61），并分离成顶部物流（29），其被再循环到精馏单元I和底部流（40）中， ，其从系统中移除，其中 残渣解离单元IV以及解离式锅炉（61）还包括精馏塔（62），其最底部得到的液体的含水量小于0.1重量％。