公开(公告)号：DE10227073A1

公开(公告)日：2003-07-03

申请号：DE10227073

申请日：2002-06-17

Applicant: BASF AG

Inventor： BASTIAENSEN ERIK ,  ECK BERND ,  THIEL JOACHIM ,  ROCHETTE PAUL ,  BAUMANN DIETER

IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07

Abstract: Purification of acrylic acid or methacrylic acid comprises crystallization to form an acrylic acid or methacrylic acid enriched product crystallizate and a mother liquor, distillation of at least a portion of the mother liquor to form a distillation residue that is at least partially drawn off and a head product and crystallization of at least a portion of the head product to form a crystallizate that is recycled. A process for the purification of acrylic acid or methacrylic acid by crystallization and distillation comprises: (A) crystallization of an acrylic or methacrylic acid containing mixture by formation of an acrylic acid or methacrylic acid enriched product crystallizate and a mother liquor; (B) distillation of at least a portion of the mother liquor to form a distillation residue that is at least partially drawn off and a head product; (C) crystallization of at least a portion of the head product to form a crystallization residue that is drawn off and a crystallizate; and (D) recycling of the crystallizate from step (C) to step (A).