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公开(公告)号：BR9201132A
公开(公告)日：1992-12-01
申请号：BR9201132
申请日：1992-03-31
Applicant: BASF AG
Inventor： KOHLHAUPT REINHOLD , GAENG MANFRED , BIEG WALTER , FANKHAENEL MATTHIAS , HAAS LOTHAR , ENGELHARDT GUENTER
IPC: C07D209/36 , C09B7/02 , C09B7/00 , C09C3/06
Abstract: A process for the preparation of purified indigo comprises extracting the aqueous alkaline indoxylate solution arising from the synthesis with an inert water-insoluble solvent in the absence of oxygen before oxidizing the indoxylate solution to give indigo.
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