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    Process for obtaining caprolactam by depolymerization of polycaprolactam
    1.
    发明专利
    Process for obtaining caprolactam by depolymerization of polycaprolactam 未知

    公开(公告)号：CZ287899B6

    公开(公告)日：2001-03-14

    申请号：CZ176497

    申请日：1995-12-01

    Applicant: BASF AG

    Inventor： KALCK ULRICH ,  JONES SIMON A ,  BASSLER PETER ,  PRIESTER CLAUS ULRICH ,  KOPIETZ MICHAEL

    IPC: C07D201/12

    Abstract: Caprolactam is obtained from a mixture that contains polymers or thermoplastic moulding materials having repeating units -¦-N(H)-(CHi2)i5-C(O)-¦-, (a) by depolymerization at elevated temperatures and in the presence of a base and under reduced pressure, or (b) in the presence of water, whereby the mixture contains substantially: 50 to 99.9 percent by weight of polymer or the thermoplastic moulding material having the repeating units, -¦-N(H)-(CHi2)i5-C(O)-¦-; 0.1 do 50 percent by weight of ingredients being selected from a group comprising inorganic filling agents, organic or inorganic pigments and dyestuffs; 0 to 10 percent by weight of organic and/or inorganic additives; 0 to 40 percent by weight of a polymer that is free of polyamide and 0 to 20 percent by weight of polyamides except for polycaprolactam and copolyamides being prepared from caprolactam. The depolymerization process ia carried out in the presence of water without addition of acid or base at a temperature ranging from 270 to 350 degC and weight ratio of water to the polymer or the thermoplastic moulding material ranging from 1:1 to 20:1 and for a reaction period shorter than 3 hours.

    3.
    发明专利
    未知

    公开(公告)号：BR9509991A

    公开(公告)日：1997-12-30

    申请号：BR9509991

    申请日：1995-12-01

    Applicant: BASF AG

    Inventor： KALCK ULRICH ,  JONES SIMON A ,  BASSLER PETER ,  PRIESTER CLAUS-ULRICH ,  KOPIETZ MICHAEL

    IPC: C07D201/12

    Abstract: Caprolactam is obtained from mixtures which contain polymers or thermoplastic molding materials having the repeating unit -N(H)-(CH2)5-C(O)- (a) by cleavage at elevated temperatures in the presence of a base under reduced pressure or (b) in the presence of water, by using a mixture essentially comprising from 50 to 99.9% by weight of a polymer or of a thermoplastic molding material having the repeating unit -N(H)-(CH2)5-C(O)- from 0.1 to 50% by weight of additives selected from the group consisting of inorganic fillers, organic and inorganic pigments and dyes, from 0 to 10% by weight of organic and/or inorganic additives, from 0 to 40% by weight of non-polyamide-containing polymers and from 0 to 20% by weight of polyamides, with the exception of polycaprolactam and copolyamides prepared from caprolactam, and carrying out the cleavage in the presence of a base under reduced pressure, the water content of the mixture used being not more than 0.01% by weight, or carrying out the cleavage in the presence of water without the addition of acid or base at from 270 DEG to 350 DEG C. and a weight ratio of water to polymer or thermoplastic molding material of from 1:1 to 20:1 and in a reaction time of less than 3 hours.

    OBTAINING CAPROLACTAM BY DEPOLYMERIZATION OF MOLTEN POLYCAPROLACTAM
    4.
    发明专利
    OBTAINING CAPROLACTAM BY DEPOLYMERIZATION OF MOLTEN POLYCAPROLACTAM 未知

    公开(公告)号：CA2208222A1

    公开(公告)日：1996-06-20

    申请号：CA2208222

    申请日：1995-12-01

    Applicant: BASF AG

    Inventor： KOPIETZ MICHAEL ,  JONES SIMON A ,  BASSLER PETER ,  PRIESTER CLAUS ULRICH ,  KALCK ULRICH

    IPC: C07D201/12 ,  C07D223/10

    Abstract: Caprolactam is obtained from mixtures which contain polymers or thermoplastic molding materials having the repeating unit -¢-N(H)-(CH2)5-C(O)-!-, (a) by depolymerization at elevated temperatures in the presence of a base under reduced pressure or (b) in the presence of water, by using a mixture essentially comprising, from 50 to 99.9 % by weight of a polymer or of a thermoplastic molding material having the repeating unit -¢-N(H)-(CH2)5-C(O)-!-; from 0.1 to 50 % by weight of additives selected from the group consisting of inorganic fillers, organic and inorganic pigments and dyes; from 0 to 10 % by weight of organic and/or inorganic aditives; from 0 to 40 % by weight of non-polyamide-containing polymers and from 0 to 20 % by weight of polyamides, with the exception of polycaprolactam and copolyamides prepared from caprolactam, and carrying out the depolymerization in the presence of a base under reduced pressure, the water content of the mixture used being not more than 0.01 % by weight, or carrying out the depolymerization in the presence of water without the addition of acid or base at from 270 to 350 ~C and a weight ratio of water to polymer or thermoplastic molding material of from 1:1 to 20:1 and in a reaction time of less than 3 hours.

    METHOD FOR CAPROLACTAM PRODUCTION BY MOLTEN POLYCAPROLACTAM DEPOLYMERIZATION
    5.
    发明专利
    METHOD FOR CAPROLACTAM PRODUCTION BY MOLTEN POLYCAPROLACTAM DEPOLYMERIZATION 未知

    公开(公告)号：BG63200B1

    公开(公告)日：2001-06-29

    申请号：BG10157297

    申请日：1997-06-05

    Applicant: BASF AG

    Inventor： KALCK ULRICH ,  JONES SIMON A ,  BASSLER PETER ,  PRIESTER CLAUS U ,  KOPIETZ MICHAEL

    IPC: C07D201/12

    Abstract: Caprolactam is produced from mixtures containing polymers or thermoplastic moulded materials with a repeating structural unit -[N(H)-(CH2)5-C(O)-]-, by depolymerization at elevated temperatures in the presence of water. The mixture used includes, in wt. %: from 50 to 99.9 polymer or thermoplastic moulded materials containing a repeating structural unit -[-N(H)-(CH2)5-C(O)-]-, from 0.1 to 50 additives as inorganic fillers, organic and inorganic pigments and dyestuffs, from 0 to 10 organic and/or inorganic additives, from 0 to 40 non-polyamide-containing polymers and from 0 to 20 polyamides, with the exception of polycaprolactam and co-polymers, produced from caprolactam. The depolymerization is effected in the presence of water without any addition of an acid or a base at temperatures ranging from 270 to 350 degrees C and weight ratio between water and polymer or the thermoplastic moulded material from 1:1 to 20:1, for a time less than 3 hours. 1 claim

    8.
    发明专利
    未知

    公开(公告)号：AT217860T

    公开(公告)日：2002-06-15

    申请号：AT98906939

    申请日：1998-02-09

    Applicant: BASF AG

    Inventor： MERKLE HANS RUPERT ,  EVA RONALD R ,  FRANKE DIRK ,  JONES SIMON A ,  MATTMANN WOLFGANG ,  MUNZINGER MANFRED

    IPC: C07C51/48 ,  C07C51/02 ,  C07C65/03 ,  C07C65/21 ,  C07C65/24

    Abstract: PCT No. PCT/EP98/00705 Sec. 371 Date Jul. 28, 1999 Sec. 102(e) Date Jul. 28, 1999 PCT Filed Feb. 9, 1998 PCT Pub. No. WO98/37054 PCT Pub. Date Aug. 27, 1998A process for the isolation of 3-[2-chloro-4-(trifluoromethyl)phenoxy]benzoic acid of the formula I from an aqueous solution of its metal salt comprises a) reacting the metal salt of 3-[2-chloro-4-(trifluoromethyl)phenoxy]benzoic acid with an organic or inorganic acid; b) heating the reaction mixture until a liquid two-phase system of organic and aqueous phase has formed; and c) separating the organic phase from the aqueous phase.

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