METHOD OF PRODUCING CARBOXYMETHYL CELLULOSE AMIDE Russian patent published in 2011 - IPC C08B15/06 

FIELD: chemistry.

SUBSTANCE: method involves treating cellulose with 30% aqueous solution of an alkali in an isopropyl alcohol and then adding an alkylating agent while stirring. The alkylating agent used is an amide of monochloracetic acid. The mixture of cellullose and amide of monochloracetic acid is kept for 2-5 hours at temperature 55°C. The obtained fibrous product is washed with 70% aqueous solution of ethyl alcohol until neutral reaction of washing water and then dried at 70°C. The method is easy to implement. Synthesis is carried out in a single step without using toxic substances.

EFFECT: introduction of amide groups to the cellulose ether results in high heat- and salt-resistance compared to carboxymethyl cellulose, change in sorption capacity with respect to ions of polyvalent metals.

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