Purification of (methyl) acrylic acid hydroxy alkyl ester

Application Number  00129086 Application Date  2000.09.29
Publication Number  1293185 Publication Date  2001.05.02
Priority Information   1999/10/7 JP 286974/1999  
Applicant(s) Name  Nippon Shokubai Co., Ltd.  
Inventor(s) Name  Kometa Yukihiro;Shibusawa Bunsei;Aratani Kyohiro  
Patent Agency Code  11038 Patent Agent  liu jinhui
AbstractThe present invention provides: a purification process for hydroxyalkyl (meth)acrylate that suppresses forming by-products such as a diester and a dimer of acrylic acid in the distillation process, and can ensure a purity of hydroxyalkyl (meth)acrylate, and can operate stably without causing troubles such as polymerization. In a purification process for hydroxyalkyl (meth)acrylate which is obtained by reacting (meth)acrylic acid and alkylene oxide in the presence of a catalyst, and removing unreacted alkylene oxide and/or (meth)acrylic acid in a reaction solution after the reaction, a distillation apparatus having a portion of a vacant column and a thin-film evaporation apparatus are used at the same time.