Patent ID: 6410789
Filing Date: 2002-06-25
Classification: B01J,C07C

Abstract:
A process for preparing aromatic polyamine mixtures which contain compounds of the formula (I)H2Nâ€”Aâ€”CH2â€”Bâ€”NH2â€ƒâ€ƒ(I) where A and B are 1,4-phenylene radicals each of which independently of one another can have from 1 to 4 substituents selected from C1-20 alkyls and halogens,by reacting a compound of the formula (IV)Hâ€”Aâ€”NHâ€”CH2â€”HNâ€”Bâ€”Hâ€ƒâ€ƒ(IV) and/or a compound of the formula (V)Hâ€”Aâ€”NHâ€”CH2â€”Bâ€”NH2â€ƒâ€ƒ(V) where A and B are substituted as defined above,at from 20Â° C. to 200Â° C. in the presence of a heterogeneous inorganic catalyst which is selected from the group consisting ofa) one or more oxides of elements of group 3 to group 10 of the Periodic Table of Elements, except vanadium, which can be acid-activated by sulfuric acid, phosphoric acid or hydrochloric acid and can thus contain sulfate, phosphate or chloride, b) a catalyst comprising a clay which is doped with at least one oxide of elements of groups 2 to 13 or the lanthanides of the Periodic Table of the Elements, carried out by impregnation or by means of ion exchange, and can be acid-activated or c) a catalyst comprising one or more silicates which can be acid-activated and have an acidity below pKa=1.5 of more than 0.05 mmol/g of catalyst.