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公开(公告)号：US3344198A
公开(公告)日：1967-09-26
申请号：US43704465
申请日：1965-03-04
Applicant: BASF AG
Inventor： MARTIN WEITZ HANS , HUGO KROEPER , ULRICH WAGNER , JOSEF RITZ
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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).
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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
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.
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