CARBOXYMETHYLCELLULOSE PRODUCTION PROCESS Russian patent published in 1998 - IPC

FIELD: cellulose derivatives production. SUBSTANCE: cotton cellulose cut to 3-4 mm fiber length is placed into apparatus-activator provided with two- blade stirrers and subjected to mercerization at bath module from 1:1.8 to 1: 2.0. Material is then treated by sodium monochloroacetate gradually raising temperature from 30 to 65-75 C. Process is completed in pneumatic tube at 40-45 C to yield product with substitution degree 72-77%, solubility up to 99.5%, and water loss coefficient 6-9 cu.m. EFFECT: increased product characteristics. 1 tbl