公开(公告)号：DE59602419D1

公开(公告)日：1999-08-19

申请号：DE59602419

申请日：1996-04-24

Applicant: BASF AG

Inventor： ETTL ROLAND ,  KASEL WOLFGANG ,  FANKHAENEL MATTHIAS ,  REUTHER WOLFGANG

IPC: C07C45/89 ,  C07C49/88 ,  C07D305/12

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.