公开(公告)号：US3634300A

公开(公告)日：1972-01-11

申请号：US3634300D

申请日：1970-11-04

Applicant: BASF AG

Inventor： FISCHER HERMANN ,  HEIL EDUARD ,  SWOBODA JOHANN ,  THOMA RICHARD

IPC: C08F6/10 ,  C08F47/22

CPC classification number: C08F6/10

Abstract: A CONTINOUS PROCESS FOR THE REMOVAL OF RESIDUAL MONOMERS FROM SOLUTION OF ACRYLONITRILE POLYMERS IN DIMETHYLFORMAMIDE AND FOR CONCENTRATING THE SOLUTIONS IN A SEQUENCE OF SEPARATING ZONES PRESSURE RELEASE ZONES, HEATING ZONES AND PRESSURE RELEASE ZONES. THE PROCESS IS DISTINGUISHED BY SHORT RESIDENCE TIMES AND ONLY SLIGHT DAMAGE TO THE POLYMER SOLUTIONS. THE SOLUTIONS OBTAINED MAY SERVE FOR THE PRODUCTION OF FILAMENTS, THREADS OR FIBERS.

公开(公告)号：CA1000743A

公开(公告)日：1976-11-30

申请号：CA170729

申请日：1973-05-08

Applicant: BASF AG

Inventor： NAARMANN HERBERT ,  THOMA RICHARD

IPC: C07C35/06 ,  C07C35/21 ,  C08K5/053

公开(公告)号：CA1222590A

公开(公告)日：1987-06-02

申请号：CA456616

申请日：1984-06-14

Applicant: BASF AG

Inventor： PIPPER GUNTER ,  SCHMIDT FRANZ ,  THEYSOHN RAINER ,  RIEGGER SIEGFRIED ,  HEIL EDUARD ,  FISCHER HERMANN ,  THOMA RICHARD ,  MATTHIES PAUL

IPC: C08G69/00 ,  C08G69/26 ,  C08G69/28 ,  C08L77/00

Abstract: - 10 - O.Z. 0050/36564 Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250-300.degree.C under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250 to 300.degree.C, wherein the aqueous salt solution is condensed under superatmospheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

公开(公告)号：CA1090039A

公开(公告)日：1980-11-18

申请号：CA300189

申请日：1978-03-31

Applicant: BASF AG

Inventor： FISCHER HERMANN ,  THOMA RICHARD ,  KAEPPEL HANSHELMUT ,  KOCHENDOERFER ERNST ,  LAGALY WERNER

IPC: C08G63/00 ,  C08G63/52 ,  C08G63/68

Abstract: An economical and environmentally advantageous process for the continuous manufacture of unsaturated polyesters, wherein the vapors formed during the polycondensation are purified, in a two-part distillation column, to a degree where the residual content of organic starting materials is less than 1.5 per cent by weight, based on the total weight of the effluent, and the unconverted starting materials are recycled to the process.