The invention relates to the field of producing isocyanates, in particular, to a method for producing (poly)diaminodiphenylmethane used to obtain polyisocyanates. The invention relates to a method for changing a molecular weight distribution of pDADPM by recycling a part of dimeric components to the synthesis step. The invention also relates to a method for producing (poly)diphenylmethane diisocyanate by reacting the obtained (poly)diaminodiphenylmethane with phosgene, and to the (poly)diphenylmethane diisocyanate obtained by this method.

The invention relates to the field of producing isocyanates, in particular, to a method for producing (poly)diaminodiphenylmethane used to obtain polyisocyanates. The invention relates to a method for changing a molecular weight distribution of pDADPM by recycling a part of dimeric components to the synthesis step. The invention also relates to a method for producing (poly)diphenylmethane diisocyanate by reacting the obtained (poly)diaminodiphenylmethane with phosgene, and to the (poly)diphenylmethane diisocyanate obtained by this method.

The invention relates to the field of producing isocyanates, in particular, to a method for producing (poly)diaminodiphenylmethane used to obtain polyisocyanates. The invention relates to a method for changing a molecular weight distribution of pDADPM by recycling a part of dimeric components to the synthesis step. The invention also relates to a method for producing (poly)diphenylmethane diisocyanate by reacting the obtained (poly)diaminodiphenylmethane with phosgene, and to the (poly)diphenylmethane diisocyanate obtained by this method.

A method for producing an arylamine compound, wherein a chemical compound represented by formula (B) is reacted by addition reaction with a carbon atom having a bound hydrogen atom on a benzene ring of a chemical compound represented by formula (A), in the presence of one or more acids selected from Lewis acids or sulfonic acids; to produce a chemical compound represented by formula (C) including a partial structure represented by formula (D).

A method for producing an arylamine compound, wherein a chemical compound represented by formula (B) is reacted by addition reaction with a carbon atom having a bound hydrogen atom on a benzene ring of a chemical compound represented by formula (A), in the presence of one or more acids selected from Lewis acids or sulfonic acids; to produce a chemical compound represented by formula (C) including a partial structure represented by formula (D).

Provided is a simple and environmentally friendly process for preparing tertiary amines by the aminomethylation of alkenes. This process features relatively mild reaction conditions and no metal catalyst.

Provided is a simple and environmentally friendly process for preparing tertiary amines by the aminomethylation of alkenes. This process features relatively mild reaction conditions and no metal catalyst.

The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.

The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.

The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.