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    METHOD FOR PURIFYING EPSILON-CAPROLACTAM
    2.
    发明专利
    METHOD FOR PURIFYING EPSILON-CAPROLACTAM 失效

    公开(公告)号：JPH07330719A

    公开(公告)日：1995-12-19

    申请号：JP12030994

    申请日：1994-06-01

    Applicant: TORAY INDUSTRIES

    Inventor： NISHIMURA KAZUAKI ,  OKUBO TAKASHI ,  ICHIMURA FUMIO

    IPC: C07D201/16

    Abstract: PURPOSE:To obtain high-purity epsilon-caprolactam by depolymerizing a thermoplastic substance containing nylon 6 as a principal component and further containing polyethylene terephthalate, recovering the epsilon-caprolactam, adding a basic substance thereto and distilling the resultant mixture. CONSTITUTION:This method for purifying epsilon-caprolactam is to depolymerize a thermoplastic substance containing nylon 6 as a principal component and further containing polyethylene terephthalate in the presence of water using phosphoric acid and/or a phosphate catalyst, provide the epsilon-caprolactam, then add a basic substance to the recovered epsilon-caprolactam, distill the resultant mixture, afford the distilled out 6-caprolactam, crystallize the distilled out epsilon- caprolactam and provide the high-purity epsilon-caprolactam. In the depolymerization, steam is preferably continuously fed to a depolymerization reactor to continuously recover the produced epsilon-caprolactam, together with water, from the reactor and feed the recovered epsilon-caprolactam to the distillation step. An alkaline hydroxide, an alkaline hydrogencarbonate, an alkaline carbonate and an alkaline phosphate are cited as the basic substance to be added to the epsilon-caprolactam before the distillation and the alkaline hydroxide, above all, NaOH is preferred.

    PRODUCTION OF HEXAMETHYLENEDIAMINE
    4.
    发明专利
    PRODUCTION OF HEXAMETHYLENEDIAMINE 失效

    公开(公告)号：JPS59219253A

    公开(公告)日：1984-12-10

    申请号：JP9406483

    申请日：1983-05-30

    Applicant: TORAY INDUSTRIES

    Inventor： SETSUDA TSUTOMU ,  KONDOU RIYOUZOU ,  ICHIMURA FUMIO

    IPC: B01J23/75 ,  B01J23/00 ,  B01J23/74 ,  C07B61/00 ,  C07C67/00 ,  C07C209/00 ,  C07C209/48 ,  C07C211/09 ,  C07C87/14

    Abstract: PURPOSE:To obtain the titled compound useful as a raw material for the polymerization of polyamide, in high yield and purity, suppressing the side reactions, by hydrogenating aminocapronitrile under specific condition. CONSTITUTION:The objective compound can be produced by reacting aminocapronitrile with hydrogen under hydrogen-pressure of 1-50kg/cm at 50-140 deg.C in the presence of a cobalt/alumina catalyst and 0.2-4, preferably 0.5-2pts.wt. of water, based on 100pts.wt. of the nitrile. Preferably, the reaction is carried out by adding 0.01-1pts.wt., based on 100pts.wt. of the nitrile, of a caustic alkali, e.g. caustic soda, etc. to the reaction system. EFFECT:The catalytic activity can be remarkably increased by the presence of water in the reaction system, and the rate of reaction can be doubled compared with the anhydrous reaction system.

    METHOD FOR PURIFYING EPSILON-CAPROLACTAM
    7.
    发明专利
    METHOD FOR PURIFYING EPSILON-CAPROLACTAM 失效

    公开(公告)号：JPH07330720A

    公开(公告)日：1995-12-19

    申请号：JP12031094

    申请日：1994-06-01

    Applicant: TORAY INDUSTRIES

    Inventor： NISHIMURA KAZUAKI ,  OKUBO TAKASHI ,  ICHIMURA FUMIO

    IPC: C07D201/16

    Abstract: PURPOSE:To obtain high-purity caprolactam by depolymerizing a thermoplastic substance containing nylon 6 as a principal component and containing further nylon 66, adding a basic substance to the recovered epsilon-caprolactam, distilling the resultant mixture and crystallizing the distilled out epsilon-caprolactam. CONSTITUTION:This method for purifying epsilon-caprolactam is to depolymerize a thermoplastic substance containing nylon 6 as a principal component and further containing nylon 66 in the presence of water using preferably phosphoric acid and/or a phosphate catalyst, recover the epsilon-caprolactam, then add a basic substance to the recovered epsilon-caprolactam, distill the resultant mixture, afford the distilled cut epsilon-caprolactam, crystallize the distilled out epsilon-caprolactam and provide the high-purity epsilon-caprolactam. The thermoplastic substance further containing at least one selected from cellulosic fibers, proteinic fibers, acrylic fibers, polyurethanes, polyacrylates and polyethylene terephthalate therein may be used. In the depolymerization, steam is preferably continuously fed to a reactor to continuously take out the produced epsilon-caprolactam, together with water, from the reactor.

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