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.

公开(公告)号：DE3445288A1

公开(公告)日：1986-06-19

申请号：DE3445288

申请日：1984-12-12

Applicant: BASF AG

Inventor： BIEG WALTER ,  HEIDA BERND

IPC: C12P1/00 ,  C12P7/26 ,  C12P7/40 ,  C12P17/08

公开(公告)号：ES2107483T3

公开(公告)日：1997-12-01

申请号：ES92111596

申请日：1992-07-08

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD DR ,  BIEG WALTER ,  LANG ERNST DR

IPC: C07D209/36 ,  C09B7/02 ,  C09B67/54

Abstract: A process for purifying indigo comprises stripping the as-synthesized aqueous alkaline indoxylate solution before its oxidation to indigo of impurities in the absence of oxygen by distillation or by passing in steam or an inert gas and then treating the indigo precipitated on oxidation of the stripped indoxylate solution with dilute hydrogen peroxide solution.

公开(公告)号：DE59208937D1

公开(公告)日：1997-11-06

申请号：DE59208937

申请日：1992-07-08

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD DR ,  BIEG WALTER ,  LANG ERNST DR

IPC: C07D209/36 ,  C09B7/02 ,  C09B67/54

Abstract: A process for purifying indigo comprises stripping the as-synthesized aqueous alkaline indoxylate solution before its oxidation to indigo of impurities in the absence of oxygen by distillation or by passing in steam or an inert gas and then treating the indigo precipitated on oxidation of the stripped indoxylate solution with dilute hydrogen peroxide solution.

公开(公告)号：ES2044730T3

公开(公告)日：1994-01-01

申请号：ES92105033

申请日：1992-03-24

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD DR ,  GAENG MANFRED DR ,  BIEG WALTER ,  FANKHAENEL MATTHIAS DR ,  HAAS LOTHAR ,  ENGELHARDT GUENTER DR

IPC: C07D209/36 ,  C09B7/02

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.

公开(公告)号：DE59200014D1

公开(公告)日：1993-11-04

申请号：DE59200014

申请日：1992-03-24

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD DR ,  GAENG MANFRED DR ,  BIEG WALTER ,  FANKHAENEL MATTHIAS DR ,  HAAS LOTHAR ,  ENGELHARDT GUENTER DR

IPC: C07D209/36 ,  C09B7/02

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.

公开(公告)号：BR9202583A

公开(公告)日：1993-03-16

申请号：BR9202583

申请日：1992-07-10

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD ,  BIEG WALTER ,  LANG ERNST

IPC: C07D209/36 ,  C09B7/02 ,  C09B67/54 ,  C09B7/00

Abstract: A process for purifying indigo comprises stripping the as-synthesized aqueous alkaline indoxylate solution before its oxidation to indigo of impurities in the absence of oxygen by distillation or by passing in steam or an inert gas and then treating the indigo precipitated on oxidation of the stripped indoxylate solution with dilute hydrogen peroxide solution.