PROCESS FOR THE PURIFICATION OF (METH)ACRYLIC ACID

摘要

A process for the purification of (meth)acrylic acid by adding a second component to crude (meth)acrylic acid and subjecting the resulting solution to a crystallization. Specifically, the process comprises adding one or more polar organic substances as the second component to crude (meth)acrylic acid in a concentration of 1 to 35 %, subjecting the resulting (meth)acrylic acid solution to crystallization, and separating a crystalline (meth)acrylic acid precipitate thus formed from the mother liquor. The process is an economical one which makes it possible to free crude (meth)acrylic acid from impurities difficultly removable by distillation without employing a large amount of the second component or very low temperature. Further, the residual mother liquor can be as such used as the raw material for the preparation of (meth)acrylic esters.