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An aminal or aminoacetal is a functional group or type of organic compound that has two amine groups attached to the same carbon atom: -C(NR₂)(NR₂)-. (As is customary in organic chemistry, R can represent hydrogen or an alkyl group).
Process for the preparation of methylenedianiline and polymethylenepolyphenylamine
A mixture of methylene diphenylamine isomers and polymethylene polyaniline is prepared with a controllable ratio of methylene diphenylamine isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylenediamine (acetalamine), which is then partially rearranged in the presence of a heterogeneous catalyst to a mixture of aminobenzylaniline and methylene diphenylamine isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert the remaining aminobenzylaniline isomers to methylene diphenylamine and polymethylene polyaniline.
Owner:DOW GLOBAL TECHNOLOGIES LLC
Process for the preparation of polymethylene polyphenylamine using a lewis acid modified clay catalyst
A mixture of methylenedianiline isomers and polymethylenepolyaniline is produced at a controlled ratio of methylenedianiline isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylene diamine (aldolamine), which is then partially rearranged in the presence of a Lewis acid-modified clay catalyst into a mixture of aminobenzylaniline isomers and methylenedianiline isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert remaining aminobenzylaniline isomers to methylenedianiline and polymethylenepolyaniline.
Owner:DOW GLOBAL TECHNOLOGIES LLC