METHOD FOR THE PRODUCTION OF CAPROLACTAM BY DEPOLYMERIZATION OF MOLTEN POLYCAPROLACTAM

    公开(公告)号:BG101572A

    公开(公告)日:1998-01-30

    申请号:BG10157297

    申请日:1997-06-05

    Applicant: BASF AG

    Abstract: Caprolactam is produced from mixtures including polymers orthermoplastic moulded materials containing the repetitativestructural unit -[N(H)-(CH2)5-C(O)-]-, by depolymerization atelevated temperatures in the presence of a base at reducedpressure or in the presence of water by using a mixture consistingof the following components, in wt.%: from 50 to 99.9 polymer orthermoplastic moulded materials containing the repetitativestructural unit -[N(H)-(CH2)5-C(O)-]-, from 0.1 to 50 additivesselected from inorganic fillers, organic and inorganic pigmentsand dyestuffs, from 0 to 10 organic and/or inorganic additives,from 0 to 40 non-polyamide-containing polymers, and from 0 to 20polyamides, with the exception of polycaprolactam andco-polyamides produced from caprolactam. Depolymerization occursin the presence of a base under reduced pressure, the watercontent of the mixture used is not more than 0.01% wt., or in thepresence of water without any addition of acid or base attemperatures ranging from 270 to 350°C, weight ratio between waterand polymer or the thermoplastic moulded material from 1:1 to 20:1and reaction time less than 3 hours.

    METHOD OF OBTAINING CAPROLACTAM BY DEPOLYMERISATION OF FUSED POLYCAPROLACTAM

    公开(公告)号:PL320594A1

    公开(公告)日:1997-10-13

    申请号:PL32059495

    申请日:1995-12-01

    Applicant: BASF AG

    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

    公开(公告)号:AU4301196A

    公开(公告)日:1996-07-03

    申请号:AU4301196

    申请日:1995-12-01

    Applicant: BASF AG

    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.

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