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

公开(公告)号：SK66897A3

公开(公告)日：1998-03-04

申请号：SK66897

申请日：1995-12-01

Applicant: BASF AG

Inventor： KALCK ULRICH ,  JONES SIMON A ,  BASSLER PETER ,  PRIESTER CLAUS U ,  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)-]-, by depolymerization at elevated temperatures in the presence of a base under reduced pressure or 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 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 pressure from 80 to 150 kPa 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.

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

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

IPC: C07D201/12

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.