公开(公告)号：IN167450B

公开(公告)日：1990-10-27

申请号：IN736MA1987

申请日：1987-10-14

Applicant: BASF AG

Inventor： UWE BRAND ,  RUEDIGER SCHMITZ ,  ERNST DEUKER ,  HUGO FUCHS

IPC: C07D201/04 ,  C07D201/16 ,  C01C1/24

Abstract: Reaction mixtures obtained by Beckmann rearrangement of cyclohexanone oxime with sulfuric acid or oleum are neutralized by a process which comprises the following steps: (a) mixing the reaction mixture with recycled ammonium sulfate mother liquor whose concentration is chosen so that no solid ammonium sulfate is precipitated during the neutralization, (b) neutralization by feeding gaseous ammonia which contains water or an aqueous ammonium sulfate solution in finely divided liquid form through a plurality of nozzle orifices into the solution of the reaction mixture in the ammonium sulfate mother liquor at elevated temperatures, (c) separation of crude lactam from the aqueous ammonium sulfate solution, (d) evaporation of the ammonium sulfate solution under reduced pressure and with separation of the crystalline ammonium sulfate from the ammonium sulfate mother liquor and (e) recycling of the ammonium sulfate mother liquor to stage a).

公开(公告)号：IN170787B

公开(公告)日：1992-05-23

申请号：IN245MA1988

申请日：1988-04-19

Applicant: BASF AG

Inventor： HUGO FUCHS ,  ERWIN THOMAS ,  JOSEF RITZ ,  FRANZ-JOSEF WEISS

IPC: B01J23/42 ,  C01B21/14

Abstract: Hydroxylammonium salts are prepared by catalytic reduction of nitrogen monoxide with hydrogen at elevated temperature in a dilute aqueous solution of a mineral acid in the presence, in suspension, of a supported platinum catalyst obtainable by precipitating metallic platinum from an aqueous platinum solution onto a support by means of a reducing agent in the presence of an organic chelating agent and partially poisoned with sulfur.

公开(公告)号：IN172064B

公开(公告)日：1993-03-27

申请号：IN687MA1988

申请日：1988-10-04

Applicant: BASF AG

Inventor： GERALD NEUBAUER ,  EMILE DE DECKER ,  HUGO FUCHS ,  BERNHARD HOLZKNECHT ,  JOSEF RITZ

IPC: C07D201/16 ,  C07D223/00

Abstract: Caprolactam is recovered from caprolactam distillation low boilers or high boilers or mixtures thereof by the following steps: (a) crystallizing a low or high boiler or a mixture thereof to form purified capro-lactam crystals and a mother liquor, (b) separating off the purified caprolactam crystals to leave a mother liquor, (c) recycling from 5 to 90% by weight of the mother liquor of stage (b) into stage (a) and transferring the remainder of the mother liquor into the subsequent stage (d), (d) crystallizing the remaining mother liquor portion from stage (c) to form caprolactam crystals and a mother liquor, separating off the caprolactam crystals of stage (e) (d) and recycling the same into stage (a) to leave a mother liquor, (f) recycling from 20 to 99% by weight of mother liquor of stage (e) into stage (d) and channeling out the remainder of the impurity-containing mother liquor of stage (e).

公开(公告)号：IN171149B

公开(公告)日：1992-08-01

申请号：IN591MA1988

申请日：1988-08-18

Applicant: BASF AG

Inventor： HUGO FUCHS

IPC: C07D201/16 ,  C07D223/00

Abstract: Distillation residues from the purification of caprolactam are worked up by heating in the presence of sodium hydroxide or potassium hydroxide and in the presence of a high-boiling hydrocarbon at from 250 DEG to 500 DEG C. and continuously removing the caprolactam.