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    3.
    发明专利
    未知

    公开(公告)号：ES2048183T3

    公开(公告)日：1994-03-16

    申请号：ES88116802

    申请日：1988-10-11

    Applicant: BASF AG

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

    IPC: C07D201/16

    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).

    5.
    发明专利
    未知

    公开(公告)号：DE59002558D1

    公开(公告)日：1993-10-07

    申请号：DE59002558

    申请日：1990-12-13

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  NEUBAUER GERALD DR ,  RITZ JOSEF DR

    IPC: C01B21/14 ,  C02F1/26 ,  C07C249/08 ,  C07C249/14 ,  C07C251/44

    Abstract: Process for processing aqueous mother liquors containing hydrochloric acid, sulphuric acid and their hydroxylammonium and ammonium salts, characterised in that the mother liquors are brought into intimate contact with an excess of cyclohexanone based on the content of hydroxylammonium salts, while maintaining a pH of 3 to 5.5 by adding alkali metal hydroxide solutions, and the cyclohexanone-oxime-containing cyclohexanone phase is separated off and washed with water until it is virtually free from chloride.

    6.
    发明专利
    未知

    公开(公告)号：DE59000835D1

    公开(公告)日：1993-03-18

    申请号：DE59000835

    申请日：1990-05-07

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  NEUBAUER GERALD DR ,  RITZ JOSEF DR ,  WEISS FRANZ-JOSEF DR

    IPC: C01B21/14

    Abstract: The crystalline hydroxylammonium sulphate having a low ammonium sulphate content is prepared by bringing an aqueous solution containing 0.02 to 0.3 part by weight of ammonium sulphate and 0.02 to 0.2 part by weight of sulphuric acid per part by weight of hydroxylammonium sulphate into contact with basic ion exchangers to give a solution having a pH of 3.0 to 4.0, concentration of the aqueous hydroxylammonium sulphate solution thus obtained and crystallisation of at most 70 % by weight of the hydroxylammonium sulphate contained in the aqueous solution.

    7.
    发明专利
    未知

    公开(公告)号：DE3766371D1

    公开(公告)日：1991-01-10

    申请号：DE3766371

    申请日：1987-01-13

    Applicant: BASF AG

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

    IPC: B01J23/00 ,  B01J23/40 ,  C01B21/093 ,  C01B21/14

    Abstract: Hydroxylamine-O-sulfonic acid is prepared by (a) reacting hydroxylammonium sulfate with oleum at elevated temperatures, (b) isolating sulfuric acid from the hydroxylamine-O-sulfonic acid formed, (c) diluting the sulfuric acid which was obtained in stage (b) and which still contains hydroxylamino-O-sulfonic acid with water to 2-6N and heating it to 30 DEG -80 DEG C. for 1-10 hours, (d) preparing hydroxylamine by catalytic reduction of nitrogen monoxide with hydrogen using the dilute sulfuric acid from stage (c) in the presence of a noble metal catalyst at elevated temperatures.

    9.
    发明专利
    未知

    公开(公告)号：ES2077943T3

    公开(公告)日：1995-12-01

    申请号：ES92112482

    申请日：1992-07-21

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  WEISS FRANZ-JOSEF DR ,  RITZ JOSEF DR

    IPC: B01J23/42 ,  B01J23/644 ,  B01J37/03 ,  C01B21/14

    Abstract: Process for the preparation of hydroxylammonium salts by reducing nitrogen monoxide with hydrogen in dilute aqueous mineral acids in the presence of suspended platinum supported catalysts partly poisoned with arsenic, at elevated temperature, characterised in that catalysts are used which have been obtained by precipitating metallic platinum from aqueous solutions of platinum salts in the presence of an oxidic arsenic compound by means of reductants onto suspended supports.

    10.
    发明专利
    未知

    公开(公告)号：DE4322953A1

    公开(公告)日：1995-01-12

    申请号：DE4322953

    申请日：1993-07-09

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  RITZ JOSEF DR ,  WILFINGER HANS JOERG DR ,  WEATHERFORD DAVID DR

    IPC: C07D201/12 ,  C07D201/16 ,  C08J11/10 ,  C08J11/14 ,  C08L77/02 ,  C07D233/10 ,  C01D7/00

    Abstract: Recovery of caprolactam and of an alkali metal carbonate from distillation residues which are obtained in the purification of caprolactam and contain caprolactam and/or oligomers and/or polymers of caprolactam, and alkali metal hydroxides, by (a) melting the distillation residues, which contain caprolactam and/or oligomers and/or polymers of caprolactam, and alkali metal hydroxides, (b) continuously removing caprolactam from the melt, (c) cooling the melt after removing caprolactam with obtainment of a residue, (d) dissolving the residue thus obtained in water and (e) subjecting the aqueous solution thus obtained to incineration with the formation of an alkali metal carbonate.

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