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    • 8. 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%。