申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0312191A2
公开(公告)日:1989-04-19
A process for the purification of methacrylic acid is disclosed which can easily remove dibasic acids and aldehydes contained in trace amounts as impurities. According to the process, crude methacrylic acid obtained as an aqueous solution by vapor-phase catalytic oxidation of isobutylene, tertiary butanol, methacrolein or isobutyl aldehyde is treated with at least one compound selected from the group consisting of m-aminophenol, m-phenylenediamine, 2,4-diaminotoluene and 2,4-diamino-diphenylamine, followed by distillation, optionally, in the presence of a p-phenylene diamine.
本发明公开了一种提纯甲基丙烯酸的工艺,该工艺可轻松去除作为杂质的微量二元酸和醛。根据该工艺,通过气相催化氧化异丁烯、叔丁醇、甲基丙烯醛或异丁醛得到的粗甲基丙烯酸水溶液,用至少一种选自间氨基苯酚、间苯二胺、2,4-二氨基甲苯和 2,4-二氨基二苯胺的化合物进行处理,然后进行蒸馏,可选择在有对苯二胺存在的情况下进行蒸馏。