公开(公告)号：BR0011403A

公开(公告)日：2002-05-14

申请号：BR0011403

申请日：2000-05-31

Applicant: BASF AG

Inventor： ECK BERND ,  HEILEK J RG ,  BAUMANN DIETER ,  SCHLIEPHAKE VOLKER

IPC: C07C51/64 ,  C07C51/25 ,  C07C51/43 ,  C07C51/47 ,  C07C57/05 ,  C07C57/07

Abstract: Acrylic acid or methacrylic acid is purified by crystallization to obtain crystals and a mother liquor, by a process in which the crystals are washed with a wash liquid containing the acid and having a temperature from 15 to 40° C. Furthermore, a process for the preparation of acrylic acid or methacrylic acid comprises the abovementioned purification process.

公开(公告)号：BR0107847A

公开(公告)日：2002-10-22

申请号：BR0107847

申请日：2001-01-24

Applicant: BASF AG

Inventor： DECKER EMILE DE ,  BASTIAENSEN ERIK ,  BAUMANN DIETER ,  ECK BERND ,  HEILEK J RG

IPC: C07C51/43 ,  C07C57/07 ,  C07C57/04

Abstract: Purification of (meth)acrylic acid by crystallisation is carried out using a combination of >=2 different dynamic crystallisation processes.