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    151.
    发明专利
    未知

    公开(公告)号：ID25716A

    公开(公告)日：2000-11-02

    申请号：ID991023

    申请日：1999-11-04

    Applicant: PRAXAIR TECHNOLOGY INC

    Inventor： ECHEGARAY DIEGO FERNANDEZ ,  VELLOSO ANTONIO AUGUSTO M ,  WAGNER MATTHEW LINCOLN

    IPC: C07D201/06 ,  C07D201/10 ,  C07D201/00

    Abstract: A method for production of caprolactam. The method involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing at least a portion of the nitric oxide to nitrogen dioxide to produce an NOx-rich process gas stream; (c) reactively absorbing the NOx-rich gas stream with phosphoric acid containing solution in an absorption zone to form nitrate ions; (d) contacting the nitrate ions with air in a degassing zone to produce a nitrate-rich aqueous process stream; (e) reducing the nitrate-rich aqueous stream with hydrogen in the presence of phosphoric acid to produce hydroxylammonium phosphate; (f) oximating the hydroxylammonium phosphate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. According to the invention, supplemental oxygen is added downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NOx-rich process gas stream.

    154.
    发明专利
    未知

    公开(公告)号：ID16013A

    公开(公告)日：1997-08-28

    申请号：ID970422

    申请日：1997-02-14

    Applicant: DSM NV ,  DU PONT

    Inventor： GUIT RUDOLF PHILIPPUS MARIA ,  FRENTZEN YVONNE HELENE

    IPC: C07D201/00 ,  C07D201/08 ,  C07D201/16 ,  C07D223/10

    Abstract: Process to separate epsi-caprolactam from an aqueous mixture containing epsi-caprolactam and at least 0.5 wt % oligomers, wherein the separation is performed by extraction using an organic extraction agent. The aqueous mixture may be obtained in a process to prepare epsi-caprolactam starting from 6-aminocapronitrile or in a process to prepare epsi-caprolactam starting from 6-aminocaproic acid.

    156.
    发明专利
    未知

    公开(公告)号：PT78708A

    公开(公告)日：1985-01-01

    申请号：PT7870884

    申请日：1984-06-07

    Applicant: BEECHAM GROUP PLC

    IPC: C07D499/00 ,  C07D499/68 ,  C07D201/00 ,  A61K

    Abstract: This invention relates to crystalline sodium amoxycillin as a novel beta -lactam antibiotics, particularly useful for parenteral administration to animals including man. The crystalline sodium amoxycillin is prepared by removing solvent molecules from a solvate of sodium amoxycillin. Preferred solvates are with tetrahydrofuran, methyl acetate and ethyl acetate.

    PRODUCTION OF CYCLOHEXANONE OXIME
    159.
    发明专利
    PRODUCTION OF CYCLOHEXANONE OXIME 未知

    公开(公告)号：YU280276A

    公开(公告)日：1982-05-31

    申请号：YU280276

    申请日：1976-11-17

    Applicant: ALLIED CHEM

    Inventor： PURGASON R L

    IPC: C07D201/00 ,  C07D201/04 ,  C07C131/04

    Abstract: This invention relates to a process for the production of cyclohexanone oxime by reacting cyclohexanone with excess aqueous hydroxylamine in the presence of excess ammonia. More specifically, the invention relates to improving yields of the oxime while reducing undesirable by-product formation by use of two or more stages of reaction with correlated adjustment of reaction conditions in each stage. The invention also involves improved recovery of the unreacted hydroxylamine reactant for recycle in the process.

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