DIAMINODIPHENYLMETHANE SYNTHESIS METHOD Russian patent published in 2010 - IPC C07C209/78 C07C211/51 C07C263/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a novel improved method for synthesis of diaminodiphenylmethane and poly(diaminodiphenylmethane), involving a step for reacting aniline with formaldehyde at temperature between 50 and 150°C in the presence of hydrogen chloride added in gas form. The method is characterised by that the aniline contains 0.1-7 wt %, preferably 2-5 wt % protonic compound selected from water and lower aliphatic alcohol.

EFFECT: method enables control of absorption of gaseous hydrogen chloride with aniline until formation of solid substances, as well as minimisation of expenses on modifying equipment.

6 cl, 4 ex