C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/597.8
C07C 87/50 (1980.01)
Patent
CA 1137514
Mo-1914 LeA 18,671 PROCESS FOR THE PREPARATION OF POLYAMINES OF THE DIPHENYL METHANE SERIES WHICH ARE RICH IN ORTHO. ISOMERS ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for the preparation of polyamines of the diphenyl methane series which are rich in ortho isomers, which comprises: (a) reacting an aromatic amine with formaldehyde to produce N-substituted pre-condensates; (b) removing the water formed in this reaction as well as any water introduced in the form of aqueous formaldehyde solution; (c) rearranging said pre- condensates in the presence of aromatic amine salts of strong acids to the corresponding primary amines substituted on the aromatic nucleus; (d) neutralizing said aromatic amine salts of strong acids; and (e) subsequently working up in known manner the resulting reaction products; wherein the quantities of reactants and of said strong acids are calculated so that the total quantity of aromatic amine used corresponds to an aromatic amine/formaldehyde molar ratio of from 4:1 to 20:1, and the total quantity of strong acid added, based on the total quantity of aromatic amine, corresponds to an aromatic amine/acid equivalent ratio of from 10:1 to 1,000:1, and at least half of the total quantity of aromatic amine used is combined with the acid to form an aromatic amine/aromatic amine salt mixture; said aromatic amine/aromatic amine salt mixture is heated to a temperature of from 100 to 200°C, said N-substituted pre-condensate, which has been maintained at a temperature of from 0 to 100°C, is introduced into this mixture; and said rearrangement of the pre-condensate is then completed at a temperature within the range of from 100 to 250°C. LeA 18,671
319238
Eifler Willi
Ellendt Gunther
Aktiengesellschaft Bayer
Sherman
LandOfFree
Process for the preparation of polyamines of the diphenyl... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of polyamines of the diphenyl..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of polyamines of the diphenyl... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-194994