METHOD OF OBTAINING CARBOXYMETHYLATED LIGNOCARBOHYDRATE MATERIAL UNDER EFFECT OF MICROWAVE RADIATION Russian patent published in 2010 - IPC C08B11/12 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical modification of lignocarbohydrate materials (LCM) and is meant for synthesis of carboxymethyl esters of lignocarbohydrate materials. Air-dried chips of lignocarbohydrate material (LCM) are treated in a medium of propanol-2 or water with sodium hydroxide in molar ratio NaOH: OH-groups of LCM equal 1:1, and then with sodium monochloroacetate in molar ratio of sodium monochloroacetate to OH-groups of LCM equal to 0.5:1. Treatment is carried out under the effect of microwave radiation with power of 210-800 W at frequency of 2.45 Hz for 10-30 seconds. The obtained product is washed with ethanol acidified with mineral acid and dried in air. Carboxymethyl esters of lignocarbohydrate materials can be used in different fields, e.g. as reagents for drilling oil and gas wells, sorbents in the construction industry etc.

EFFECT: invention enables to considerably shorten the duration of synthesis of carboxymethylated derivatives of LCM, thereby obtaining a product characterised by high content of carboxymethyl groups.

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