PECOVERY OF CAPROLACTAM
    81.
    发明专利

    公开(公告)号:JPS54128589A

    公开(公告)日:1979-10-05

    申请号:JP3619878

    申请日:1978-03-29

    Abstract: PURPOSE:To recover epsilon-caprolactam and ammonium sulfate of high purity in high yield, by separating a neutralization mixture after the Beckmann rearrangement of cyclohexanone oxime into an aqueous and an oil phases, and by extracting the phases with specific solvents. CONSTITUTION:Cyclohexanone oxime is subjected to the Beckmann rearrangement in the presence of sulfuric acid, and neutralized with aqueous ammonia to give a mixture, which is separated into an aqueous and oil phases in the first stage. In the second stage, the aqueous phase is extracted with an organic solvent e.g. benzene or toluene, to transfer organic substances, e.g. epsilon-caprolactam, from the aqueous to the solvent phase. An aqueous ammonium sulfate is thus recovered. The oil phase spearated in the first stage is extracted with the same organic solvent to give a solvent phase containing epsilon-caprolactam, which is distilled to recover the epsilon-caprolactam. Extraction is carried out by countercurrent method, using a perforated plate tower.

    82.
    发明专利
    失效

    公开(公告)号:JPS5139232B1

    公开(公告)日:1976-10-26

    申请号:JP3927271

    申请日:1971-06-07

    CATALYTIC DEAMINATION FOR CARPROLACTAM PRODUCTION

    公开(公告)号:WO2008103366A4

    公开(公告)日:2008-08-28

    申请号:PCT/US2008/002202

    申请日:2008-02-20

    Inventor: FROST, John W.

    Abstract: Catalytic processes for preparing caprolactam, pipecolinic acid, and their derivatives, from lysine or alpha-amino-epsilon-caprolactam starting materials, and products produced thereby. A process for preparing caprolactam or a derivative thereof, the process comprising contacting a reactant comprising lysine or alpha aminocaprolactam with a catalyst and a gas comprising hydrogen gas, in the presence of a solvent. The catalyst may be provided on a support material, such as a transition metal.

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