METHOD FOR CARBOXYMETHYLATION OF CELLULOSE IN N,N-DIMETHYLACETAMIDE - LiCl MEDIUM UNDER IMPACT OF MICROWAVE RADIATION Russian patent published in 2015 - IPC C08B11/12 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical cellulose modification and is intended for obtaining carboxymethylcellulose, and can be used as reagents for drilling oil and gas wells, in construction industry, as chemical reagents in flotation, mining and processing industry, as well as in pharmaceutical industry. Method for cellulose carboxymethylation consists in the following: powder cellulose is dissolved in N,N-dimethylacetamide and exposed to microwave radiation with power 700 W for 60 s, cooled to 100°C with further addition of lithium chloride LiCl, mixture is cooled to room temperature and mixed for 8 hours, with the following addition of NaOH, and exposed to microwave radiation with power 700 W for 60 s, with further addition of monochloroacetic acid, and exposed to microwave radiation with power 700 W for 60 s, placed into 70% ethyl alcohol, filtered and washed with ethanol, acidified with acetic acid, and air-dried.

EFFECT: invention makes it possible to considerably reduce duration of carboxymethylation process and obtain product, characterised by high degree of substitution, degree of polymerisation and water solubility.

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