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    2.
    发明专利
    未知

    公开(公告)号：FR2455584A1

    公开(公告)日：1980-11-28

    申请号：FR8009987

    申请日：1980-05-05

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  ASTARITA DOMENICO

    IPC: C07D201/16 ,  C07D223/10

    Abstract: A method for purifying raw caprolactam containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

    3.
    发明专利
    未知

    公开(公告)号：IT1112840B

    公开(公告)日：1986-01-20

    申请号：IT2235579

    申请日：1979-05-04

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  ASTARITA DOMENICO

    IPC: C07D201/16 ,  C07D

    Abstract: A method for purifying raw caprolactam containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

    PURIFICATION OF RAW CAPROLACTAM
    5.
    发明专利
    PURIFICATION OF RAW CAPROLACTAM 未知

    公开(公告)号：AU538254B2

    公开(公告)日：1984-08-02

    申请号：AU5803780

    申请日：1980-05-02

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  ASTARITA DOMENICO

    IPC: C07D201/16 ,  C07D223/10

    Abstract: A method for purifying raw caprolactam containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

    AN IMPROVED METHOD FOR THE PURIFICATION OF FIBER GRADE RAW CAPROLACTAM WHICH CONTAINS AS IMPURITIES ONE OR MORE PRIMARY AMIDES
    6.
    发明专利
    AN IMPROVED METHOD FOR THE PURIFICATION OF FIBER GRADE RAW CAPROLACTAM WHICH CONTAINS AS IMPURITIES ONE OR MORE PRIMARY AMIDES 未知

    公开(公告)号：IN153035B

    公开(公告)日：1984-05-19

    申请号：IN513CA1980

    申请日：1980-05-03

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  ASTARITA DOMENICO

    IPC: C07D201/16 ,  C07D41/06

    Abstract: A method for purifying raw caprolactam containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

    METHOD FOR THE PRUFICATION OF RAW CAPROLACTAM WHICH CONTAINS AMIDES AND OTHER BY-PRODUCTS
    7.
    发明专利
    METHOD FOR THE PRUFICATION OF RAW CAPROLACTAM WHICH CONTAINS AMIDES AND OTHER BY-PRODUCTS 未知

    公开(公告)号：CA1132546A

    公开(公告)日：1982-09-28

    申请号：CA351180

    申请日：1980-05-02

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  ASTARITA DOMENICO

    IPC: C07D201/16 ,  C07D223/10

    Abstract: The present invention is directed to a method for purifying raw caprolactum containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products which are small amounts of aliphatic and aromatic cyclocarboxylic acids, epsilon-aminocapronic acid and unsaturated oxidable substances. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, the concentration of raw caprolactam in the organic solvent being comprised between 2 and 12% by weight; (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two separate phases, the amount of mineral acid being from 0.02 to 0.2 parts by weight per part of raw caprolactam; (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

    Caprolactam purification by oxidn. and distn. - with fast distn. before oxidn. to give higher purity prod. suitable for nylon prodn.
    8.
    发明专利
    Caprolactam purification by oxidn. and distn. - with fast distn. before oxidn. to give higher purity prod. suitable for nylon prodn. 未知

    公开(公告)号：DE3039320A1

    公开(公告)日：1982-05-19

    申请号：DE3039320

    申请日：1980-10-17

    Applicant: SNIA VISCOSA

    Inventor： SENNI PAOLO ,  CATONI MARIO ,  ASTARITA DOMENICO

    IPC: C07D201/16

    Abstract: Raw caprolactam (I), obtd. by extn. from sulphuric soln. with alkylated phenols and re-extn. with water, is purified by oxidn. treatment (pref. with KMnO4), evapn. of the water and successive vacuum distn. The improvement is that a fast distn. in presence of an alkaline cpd. is inserted before the oxidn. treatment. "Fast" distn. means that the evapd. material is not refluxed to the evapn. zone. The purity of the obtd. (I) is further increased by the fast distn. The obtd. (I) may be of sufficient purity to produce polymerisation grade nylon-6 (i.e. nylon suitable for prodn. of industrial prods. such as fibres and plastics). The amt. of oxidising agent reqd. is reduced, which gives ecological and economic advantages, since oxidising agent cost is reduced and less (I) is destroyed by the oxidising agent.

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