METHOD OF CARBOXYMETHYLATION OF LIGNOCARBOHYDRATE MATERIALS Russian patent published in 2015 - IPC C08B11/12 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical modification of lignocarbohydrate materials (LCM) and is intended for obtaining carboxymethyl ethers of lignocarbohydrate materials in form of potassium salts. Lignocarbohydrate material in water medium is processed with potassium hydroxide (KOH) at temperature 30-80°C for 30-120 min; monochloroacetic acid (MCAA) is added with further exposure for 30-120 minutes at temperature 30-80°C, after which product is washed with water ethanol acidified with acetic acid and air-dried. Carboxymethyl ethers of lignocarbohydrate materials in form of potassium salts can be used in different fields, for instance, as reagents for drilling oil and gas wells, in construction industry, as chemical reagents in flotation, in mining and processing industry and as sorbents of heavy metals.

EFFECT: invention makes it possible to obtain product, characterised by high content of carboxyl groups (9,6-21,3%) and moderate solubility in water (16-52%).

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