EP 0000778 B1 19800723 - PROCESS FOR THE PREPARATION OF POLYAMINES OF THE DIPHENYL METHANE SERIES
Title (en)
PROCESS FOR THE PREPARATION OF POLYAMINES OF THE DIPHENYL METHANE SERIES
Publication
Application
Priority
DE 2736862 A 19770816
Abstract (en)
[origin: EP0000778A1] 1. A process for the production of polyamines of the diphenyl methane series having a high content of 4,4'-isomers and a low content of 2,2'- and 2,4'-isomers by reacting primary or secondary aromatic amines with formaldehyde in the presence of ion exchangers as solid catalysts, which ion exchangers contain sulphonic acid groups, are based on styrene-divinyl benzene copolymers and are present in heterogeneous phase, optionally by way of the intermediate stage of N-substituted precondensates produced in the absence of acid catalysts, characterised in that a) the catalysts used are water-saturated gel-form ion exchangers containing sulphonic acid groups based on styrene-divinyl benzene copolymers, which are cross-linked with 2%, by weight, based on copolymer, of divinyl benzene, or water-saturated macroporous ion exchangers containing sulphonic acid groups based on styrene-divinyl benzene copolymers which are cross-linked with 18%, by weight, based on copolymer, of divinyl benzene ; and b) the catalytic reaction is carried out within a temperature range from 50-150 degrees C optionally under pressure and without any significant distillation of the condensation water and the water introduced into the system.
IPC 1-7
IPC 8 full level
C07C 211/50 (2006.01); C07C 67/00 (2006.01); C07C 209/00 (2006.01); C07C 209/78 (2006.01)
IPC 8 main group level
C07C (2006.01)
CPC (source: EP)
C07C 209/78 (2013.01)
C-Set (source: EP)
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
EP 0000778 A1 19790221; EP 0000778 B1 19800723; BR 7805250 A 19790424; DE 2736862 A1 19790301; DE 2860072 D1 19801113; ES 472514 A1 19790216; IT 1106878 B 19851118; IT 7850728 A0 19780811; JP S5432461 A 19790309
DOCDB simple family (application)
EP 78100591 A 19780804; BR 7805250 A 19780815; DE 2736862 A 19770816; DE 2860072 T 19780804; ES 472514 A 19780811; IT 5072878 A 19780811; JP 9828478 A 19780814