METHOD FOR CARBOXYMETHYLATION OF CELLULOSE IN HOMOGENEOUS MEDIUM UNDER EFFECT OF MICROWAVE RADIATION Russian patent published in 2015 - IPC C08B11/12 C08H7/00 

FIELD: chemistry.

SUBSTANCE: method includes dissolving cellulose powder in molten LiClO₄·3H₂O salt under the effect of 560-700 W microwave radiation to obtain a solution with concentration of 1.6-3.2%; adding NaOH in molar ratio cellulose:NaOH equal to 0.003-0.006:0.06,and exposing to 560-700 W microwave radiation for 30-40 s, followed by treating with sodium monochloroacetate with molar ratio cellulose:sodium monochloroacetate equal to 0.003:0.03, and under the effect of 560-700 W microwave radiation for 30-40 s. The sodium carboxymethyl cellulose salt can be used in different fields as a reagent for drilling oil and gas wells, in the construction industry, as a chemical reagent in floatation, in the ore mining and processing industry and in the pharmaceutical industry.

EFFECT: invention cuts the duration of the carboxymethylation process, enables to obtain a product characterised by a high degree of substitution, degree of polymerisation and solubility in water.

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