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：DE4338487A1

公开(公告)日：1995-05-18

申请号：DE4338487

申请日：1993-11-11

Applicant: BASF AG

Inventor： BERGMANN UDO DR ,  HOCH HELMUT DR ,  KOHLHAUPT REINHOLD DR

IPC: C07D277/84 ,  C07C231/02 ,  C07C233/76 ,  C07C233/80 ,  C07D221/18 ,  C07C233/75 ,  C07C231/12 ,  C09B1/42 ,  C09B5/24 ,  C09B5/40

公开(公告)号：DE4336032A1

公开(公告)日：1995-04-27

申请号：DE4336032

申请日：1993-10-22

Applicant: BASF AG

Inventor： BERGMANN UDO DR ,  GAENG MANFRED DR ,  KOHLHAUPT REINHOLD DR

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

Abstract: A process for purifying indigo comprises extracting an aqueous leuco indigo alkali metal salt solution with an inert solvent under oxygen-excluding conditions and conventionally regenerating the indigo by oxidation.

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：CH594615A5

公开(公告)日：1978-01-13

申请号：CH628975

申请日：1975-05-15

Applicant: BASF AG

Inventor： KOHLHAUPT REINHOLD DR ,  BRUENEMANN HILMAR DIPL ING ,  STOECKELMANN GUENTER DR

IPC: C07C251/34 ,  C07C20060101 ,  C07C67/00 ,  C07C239/00 ,  C07C291/08 ,  C07D209/30 ,  C07C131/00

公开(公告)号：DE2242643A1

公开(公告)日：1974-03-07

申请号：DE2242643

申请日：1972-08-30

Applicant: BASF AG

Inventor： SCHUHMACHER ALFRED DR ,  KOHLHAUPT REINHOLD DR ,  HILLER HEINRICH DR

IPC: C07C205/57 ,  C07C67/00 ,  C07C201/00 ,  C07C205/61 ,  C07C79/46