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公开(公告)号：BR9710217A
公开(公告)日：1999-08-10
申请号：BR9710217
申请日：1997-06-24
Applicant: BASF AG
Inventor： LEHNERT KLAUS , MULLER-ENGEL KLAUS JOACHIM , NESTLER GERHARD , ECK BERD
IPC: C07C57/04 , C07C51/43 , C07C57/07 , C07C57/075
Abstract: PCT No. PCT/EP97/03304 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jun. 24, 1997 PCT Pub. No. WO98/01414 PCT Pub. Date Jan. 15, 19981,4-Dibenzothiazine-comprising crude acrylic acid is purified by crystallization by raising its diacrylic acid content to at least 1% by weight prior to the crystallization step.
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