METHOD OF SEPARATING ACETONITRILE FROM WATER Russian patent published in 2014 - IPC B01D17/02 C07C253/32 C07D301/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of separating acetonitrile from water and can be applied in processes of epoxydation of propylene with hydrogen peroxide. The claimed method of separating acetonitrile from water contains stages (i)-(iv). At stage (i) supplied is flow S1, containing, at least, 95 wt % of the total weight of S1, acetonitrile and water, where the weight ratio acetonitrile:water constitutes more than 1. At stage (ii) a flow P, containing, at least, 95 wt % of C3, of the total weight of the flow P, is added to S1, obtaining a mixed flow S2, with C3 representing propylene or propylene, mixed with propane with the minimal weight ratio propylene:propane 7:3. At stage (iii) the flow S2 is subjected to an impact of temperature, at most, 92°C and pressure, at least, 10 bars, obtaining the first liquid phase L1, consisting, in fact, of C3, acetonitrile and water, and the second liquid phase L2, consisting, in fact, of water and acetonitrile, where the weight ratio acetonitrile:water in L2 constitutes less than 1. At stage (iv) the liquid phase L1 is separated from the liquid phase L2. The method makes it possible to separate acetonitrile from water effectively and recirculate the separated acetonitrile into the process of propylene epoxidation.

EFFECT: invention relates to the highly integrated method of obtaining propylene oxide.

28 cl, 11 tbl, 4 ex