METHOD OF PRODUCING (CYCLO)ALIPHATIC AND AROMATIC DIISOCYANATES VIA PHOSGENATION OF (CYCLO)ALIPHATIC AND AROMATIC DIAMINES IN GAS PHASE Russian patent published in 2012 - IPC C07C263/10 C07C265/14 

FIELD: chemistry.

SUBSTANCE: according to the disclosed method, in order to heat liquid amines, evaporation thereof and/or superheating the formed vapours one or more heat exchangers are used, said heat exchangers having specific heat-exchange surface area on the side where the amines pass through at least ranging from 1·10³ m²/m³ to 1·10⁵ m²/m³, where the heat exchangers are fitted with channels for passing streams of amines, the hydraulic diameter of which ranges from 1000 to 10000 mcm.

EFFECT: method enables to cut the dwelling time of initial diamines in the system, reduce the effect of temperature loads and reduce their decomposition, owing to which the desired products are obtained with higher output and quality, and the service life o the equipment is prolonged.

8 cl, 3 ex