METHOD OF PURIFYING GLYOXAL WATER SOLUTION Russian patent published in 2014 - IPC C07C47/127 C07C45/78 B01D61/48 

FIELD: chemistry.

SUBSTANCE: invention relates to improved method of purification of glyoxal water solution by successive running of purified solution through electrodialyser chambers, separated with anion-exchange and cation-exchange membranes. Purification is performed by asymmetric alternating current of controlled frequency with the following parameters: frequency f=5-2000 Hz, voltage U_m=0.1-500 V, ratio of direct and reverse current $$J_m^n:J_m^0=2:1-12:\mathrm{1,}$$ with water solutions of alkali metals, ammonium carbonates or ammonium bicarbonates serving as collectors of admixtures in purification of glyoxal water solutions, and rate of solutions constitutes from 0.001 to 100 m/s. Invention also relates to device for purification of glyoxal water solutions.

EFFECT: method makes it possible to increase process selectivity and makes it possible to carry out purification of highly concentrated glyoxal solutions.

2 cl, 2 dwg, 1 tbl, 2 ex