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    • 9. 发明申请
    • Process for preparing alkyl esters of (meth)acrylic acid
    • 制备(甲基)丙烯酸的烷基酯的方法
    • US20060205973A1
    • 2006-09-14
    • US11358220
    • 2006-02-22
    • Thorsten HabeckUlrich RauhThorsten FrieseHans Martan
    • Thorsten HabeckUlrich RauhThorsten FrieseHans Martan
    • C07C67/36
    • C07C67/327C07C67/08C07C67/54C07C69/54
    • 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.
    • 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%。
    • 10. 发明授权
    • Method for producing (meth)acrylic acid and (meth)acrylic acid esters
    • (甲基)丙烯酸和(甲基)丙烯酸酯的制备方法
    • US06458989B1
    • 2002-10-01
    • US09646126
    • 2000-09-28
    • Heinrich AichingerHans MartanGerhard Nestler
    • Heinrich AichingerHans MartanGerhard Nestler
    • C07C6748
    • C07C51/50B01D3/225C07C51/44C07C51/487C07C67/08C07C57/04C07C69/54
    • 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.
    • 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。