METHOD FOR SYNTHESIS OF ISOCYANATES Russian patent published in 2010 - IPC C07C263/10 C07C265/14 B01J10/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for synthesis of isocyanates of general formula R(NCO)_n (I), where R is a (cyclo)aliphatic or aromatic hydrocarbon residue containing 15 carbon atoms, preferably 4-13 carbon atoms, provided that between two NCO-groups there are at least two carbon atoms, and n equals 2 or 3, through phosgenation of corresponding amines of general formula R(NH₂)_n (II), where R is a (cyclo)aliphatic or aromatic hydrocarbon residue containing up to 15 carbon atoms, preferably 4-13 carbon atoms, provided that between two amine groups there are at least two carbon atoms, and n equals 2 or 3, in gaseous phase in a tube reactor, having a central nozzle and annular space between the central nozzle and walls of the tube reactor, characterised by that turbulence is generated in the central nozzle, and in particular, turbulence of the stream entering the central nozzle increased due to one or more built-in turbulence generating elements, where the eduction stream which contains amines is fed into the tube reactor through the central nozzle, and the eduction stream containing phosgene is fed into the tube reactor through the annular space, or the eduction stream containing amines is fed into the tube reactor through the annular space and the eduction stream containing phosgene is fed into the tube reactor through the central nozzle.

EFFECT: method enables much faster mixture of reagents.

13 cl, 3 dwg, 1 ex