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    11.
    发明专利
    未知

    公开(公告)号：DD152534A5

    公开(公告)日：1981-12-02

    申请号：DD22287880

    申请日：1980-07-25

    Applicant: STAMICARBON

    Inventor： VAN GEEM PAUL C ,  DE GRAAF THEODORUS F M ,  KNOL DIRK ,  PLANTEMA OTTO G

    IPC: B01J23/00 ,  C07B61/00 ,  C07C5/11 ,  C07C27/00 ,  C07C29/04 ,  C07C29/05 ,  C07C29/06 ,  C07C29/08 ,  C07C35/08 ,  C07C45/34 ,  C07C45/39 ,  C07C67/00

    Abstract: The invention relates to a method for the preparation of cyclohexanol and/or cyclohexanone by hydrogenating benzene to cyclohexene, hydrating the cyclohexene to cyclohexanol and/or oxidating it to cyclohexanone, recovering the cyclohexanol and/or cyclohexanone, and returning unconverted benzene and/or cyclohexene to the hydrogenating step.The method according to the invention is characterized in that the mixture of cyclohexane with benzene and/or cyclohexene, which has also been obtained during the separation of cyclohexanol from the reaction mixture of the hydration step and,or of cyclohexanone from the reaction mixture of the oxidation step, is subjected to a dehydrogenation reaction, and the benzene thus obtained is returned to the hydrogenation step.The method according to the invention has the great advantage that the difficult separation of cyclohexane from mixtures with benzene and / or cyclohexene can be dispensed with. Losses of expensive extractive distillation agent are avoided. Neither is any cyclohexane left as by-product for wich a use will have to be found. In the hydrogenation step a higher degree of benzene conversion can be applied, so that economic process operation has become possible.

    12.
    发明专利
    未知

    公开(公告)号：PL225869A1

    公开(公告)日：1981-04-24

    申请号：PL22586980

    申请日：1980-07-25

    Applicant: STAMICARBON

    Inventor： VAN GEEM PAUL C ,  DE GRAAF THEODORUS F M ,  KNOL DIRK ,  PLANTEMA OTTO G

    IPC: B01J23/00 ,  C07B61/00 ,  C07C5/11 ,  C07C27/00 ,  C07C29/04 ,  C07C29/05 ,  C07C29/06 ,  C07C29/08 ,  C07C35/08 ,  C07C45/34 ,  C07C45/39 ,  C07C67/00 ,  C07C

    Abstract: The invention relates to a method for the preparation of cyclohexanol and/or cyclohexanone by hydrogenating benzene to cyclohexene, hydrating the cyclohexene to cyclohexanol and/or oxidating it to cyclohexanone, recovering the cyclohexanol and/or cyclohexanone, and returning unconverted benzene and/or cyclohexene to the hydrogenating step.The method according to the invention is characterized in that the mixture of cyclohexane with benzene and/or cyclohexene, which has also been obtained during the separation of cyclohexanol from the reaction mixture of the hydration step and,or of cyclohexanone from the reaction mixture of the oxidation step, is subjected to a dehydrogenation reaction, and the benzene thus obtained is returned to the hydrogenation step.The method according to the invention has the great advantage that the difficult separation of cyclohexane from mixtures with benzene and / or cyclohexene can be dispensed with. Losses of expensive extractive distillation agent are avoided. Neither is any cyclohexane left as by-product for wich a use will have to be found. In the hydrogenation step a higher degree of benzene conversion can be applied, so that economic process operation has become possible.

    RECOVERY OF CAPROLACTAM FROM CAPROLACTAM-CONTAINING DISTILLATION RESIDUE
    13.
    发明专利
    RECOVERY OF CAPROLACTAM FROM CAPROLACTAM-CONTAINING DISTILLATION RESIDUE 未知

    公开(公告)号：CA1221365A

    公开(公告)日：1987-05-05

    申请号：CA461995

    申请日：1984-08-29

    Applicant: STAMICARBON

    Inventor： PLANTEMA OTTO G ,  JETTEN ARNOLD G M ,  HAASEN NICOLAAS F

    IPC: C07D201/16 ,  C07D223/10

    Abstract: The invention relates to a process for recovering caprolactam from residue remaining after distillation, under reduced pressure, of impure caprolactam obtained from rearrangement of cyclohexanone oxime with sulphuric acid or oleum, comprising subjecting the residue to distillation under reduced pressure, hydrogenating the caprolactam-containing distillate so obtained in an aqueous medium and recovering caprolactam from the resulting hydrogenation product. The process provides a way of recovering the valuable caprolactam from the residue without need of any strong acid treatment and only requiring one distillation step.

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