METHOD OF OBTAINING ISOCYANATES WITH APPLICATION OF DIARYLCARBONATE Russian patent published in 2014 - IPC C07C263/04 C07C265/14 C07C269/04 C07C271/54 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining isocyanate. The method includes several stages. First, a reaction mixture, which contains arylcarbamate, containing an aryl group, formed from diarylcarbonate; an aromatic hydroxyl-compound, formed from diarylcarbonate, and diarylcarbonate, is obtained by realising interaction of diarylcarbonate and an amine compound in a reactor, in which a reaction between diarylcarbonate and the amine compound is carried out. After that, the reaction mixture is transferred into a reactor of thermal decomposition, connected by a line with the reactor, in which the reaction between diarylcarbonate and the amine compound is carried out. After that, isocyanate is obtained as a result of a reaction of thermal arylcarbamate decomposition. Diarylcarbonate includes a metal atom in a concentration from 0.001 ppm to 10%. Diarylcarbonate represents a compound of formula , where R¹ represents an aromatic group, containing from 6 to 12 carbon atoms. The amine compound represents a compound of formula , where R² represents a group, selected from an aliphatic group, containing from 1 to 20 carbon atoms, and an aromatic group, containing from 6 to 20 carbon atoms, and the said group contains an atom, selected from the carbon atom and oxygen atom, its valence equals to n and n represents an integer number from 2 to 10.

EFFECT: method makes it possible to inhibit reactions of arylcarbamate denaturation, in this way providing the stable isocyanate obtaining with the high output for a long-term period.

30 cl, 16 dwg, 1 tbl, 27 ex