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    273.
    发明专利
    未知

    公开(公告)号：IT7920244D0

    公开(公告)日：1979-02-16

    申请号：IT2024479

    申请日：1979-02-16

    Applicant: ATO CHIMIE

    Inventor： CLAUDE MICHEL JEAN ,  PHILIPPE POTIN

    IPC: C07D201/10 ,  C07D201/04 ,  C07D

    Abstract: The invention relates to a process for the preparation of lactames according to the so-called "Beckmann rearrangement" which consists in isomerizing oximes in a sulfuric solution, the weight ratio percentage of sulfuric acid to the combined amount of sulfuric acid and water being raised to a value above that of the sulfuric solution feed.

    275.
    发明专利
    未知

    公开(公告)号：AT329580B

    公开(公告)日：1976-05-25

    申请号：AT55273

    申请日：1973-01-23

    Applicant: SNIA VISCOSA

    IPC: C07D201/02 ,  C07C67/00 ,  C07C201/00 ,  C07C207/00 ,  C07C239/00 ,  C07C251/46 ,  C07D201/04 ,  C07D201/10 ,  C07D205/08 ,  C07D207/263 ,  C07D223/02 ,  C07D223/10

    Abstract: A method for the preparation of omega lactams is disclosed, more particularly epsilon caprolactam or a precursor thereof (such as cyclohexanone oxime), using as the starting material a cyclomethylene ketene, with the simultaneous formation of side products such as cyclohexanecarboxylic acid, wherein an adduct is preliminarly formed between cyclomethylene ketene and sulphur dioxide. The adduct is then reacted with a nitrosating agent so as to obtain, under the appropriate reaction conditions, the expected lactam, more specifically epsilon caprolactam.

    277.
    发明专利
    未知

    公开(公告)号：AR196751A1

    公开(公告)日：1974-02-19

    申请号：AR24633573

    申请日：1973-01-29

    Applicant: SNIA VISCOSA

    IPC: C07D201/02 ,  C07C67/00 ,  C07C201/00 ,  C07C207/00 ,  C07C239/00 ,  C07C251/46 ,  C07D201/04 ,  C07D201/10 ,  C07D205/08 ,  C07D207/263 ,  C07D223/02

    Abstract: A method for the preparation of omega lactams is disclosed, more particularly epsilon caprolactam or a precursor thereof (such as cyclohexanone oxime), using as the starting material a cyclomethylene ketene, with the simultaneous formation of side products such as cyclohexanecarboxylic acid, wherein an adduct is preliminarly formed between cyclomethylene ketene and sulphur dioxide. The adduct is then reacted with a nitrosating agent so as to obtain, under the appropriate reaction conditions, the expected lactam, more specifically epsilon caprolactam.

    278.
    发明专利
    未知

    公开(公告)号：DE1620569C3

    公开(公告)日：1973-11-08

    申请号：DE1620569

    申请日：1963-05-03

    Applicant: TORAY INDUSTRIES, INC., TOKIO

    Inventor： ITO, YOSHIKAZU ,  SHIMOKAWA, YOICHI

    IPC: C07D201/04 ,  C07D201/10 ,  C07D41/00

    Abstract: Cyclododecanoneoxime is prepared by irradiatcyclododecane in presence of a chlorine-containing nitrosation agent and a cycloalkane (up to C8), separating the resulting oil containing oxime hydrochlorides and diluting with water to precipitate cyclododecanoneoxime. The remaining solution may be neutralized to a pH at least 6.0 with aqueous alkali to precipitate the other oxime. By effecting the Beckmann rearrangement on the said oil a mixture of lactams is obtained which on dilution with water affords o -lauric lactam. In an example, e -caprolactam is recovered from the filtrate. Specification 1,010,151 is referred to.

    280.
    发明专利
    未知

    公开(公告)号：GB1297317A

    公开(公告)日：1972-11-22

    申请号：GB1297317D

    申请日：1970-10-02

    IPC: C07D201/10 ,  C07D201/02

    Abstract: 1297317 #-caprolactam RHONE-POULENC SA 2 Oct 1970 [3 Oct 1969] 47073/70 Heading C2C #-Caprolactam is prepared from a cyclohexane oxidation product containing cyclohexyl hydroperoxide and oxidation by-products including 6- hydroperoxyhexanoic acid which has been obtained by liquid phase oxidation of cyclohexane, without a metal catalyst, using a molecular oxygen containing gas, by washing the oxidation product with water, separating the resulting aqueous phase containing 6- hydroperoxy-hexanoic acid, and heating the 6-hydroperoxy-hexanoic acid under elevated pressure with ammonia and hydrogen in the presence of a hydrogenation catalyst. The oxidation product is suitably washed with 0À01 to 1À0 times its weight of water at 5-100‹ C. and the aqueous phase, prior to being heated with ammonia and hydrogen may be extracted with a liquid hydrocarbon or a water-immiscible solvent comprising an alcohol, ester or ketone; the aqueous phase may then be heated at 200- 300‹ C. under a pressure of 10-200 bars in the presence of hydrogen and 5-25 mols. of ammonia per mol. of 6-hydroperoxy-hexanoic acid. A preferred starting material is a cyclohexane solution of cyclohexyl hydroperoxide in which the oxidized products, which are less volatile than cyclohexane, contain at least 50% by wt. of peroxidic products; suitable hydrogenation catalysts include nickel, platinum, palladium, ruthenium and rhodium which may be supported.

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