公开(公告)号：US5302754A

公开(公告)日：1994-04-12

申请号：US961020

申请日：1992-10-14

申请人： Akira Ibi ,  Toshimi Ogata ,  Yoshihiro Nodate ,  Takayuki Kageyama

发明人： Akira Ibi ,  Toshimi Ogata ,  Yoshihiro Nodate ,  Takayuki Kageyama

IPC分类号： C07C231/24 ,  C07C233/09

CPC分类号： C07C231/24

摘要： A purification process of crude methacrylamide by recrystallization from an aqueous methacrylamide solution, comprising the steps of conducting crystallization by adjusting the hydrogen ion concentration of the aqueous methacrylamide solution to pH 8 or more, separating a methacrylamide crystal, adjusting 5% by weight or more of resulting mother liquor to pH 5 or less, separating precipitated insoluble matter, and reusing thus-treated mother liquor, is provided.The high quality methacrylamide crystal thus obtained is excellent in Hazen number, purity and transparency of a methanol solution and suitable for uses such as windshield glasses.

摘要翻译： 通过从甲基丙烯酰胺水溶液中重结晶，粗制甲基丙烯酰胺的纯化方法，包括通过将甲基丙烯酰胺溶液的氢离子浓度调节至pH8以上进行结晶的步骤，分离甲基丙烯酰胺结晶，调节5重量％以上 得到母液至pH5以下，分离沉淀的不溶物，并重新使用如此处理的母液。 由此获得的高品质甲基丙烯酰胺晶体的哈森数，纯度和甲醇溶液的透明度优异，适用于挡风玻璃等用途。