METHOD FOR PRODUCTION OF TECHNICAL SODIUM SALT OF CARBOXYMETHYL STARCH Russian patent published in 1998 - IPC

FIELD: textile industry; pulp and paper industry. SUBSTANCE: method is carried out in two steps. At the first step starch, carboxymethylated agent, sodium hydroxide and water are mixed within 0.5-30 min, the process is carried out in mixing device (r.p.m. being 25-300) or in rotary mixer (linear rate of mixing unit being 15-30 m/s). Sodium monochloroacetate or monochloroacetic acid are used as mentioned above carboxymethylated agent; sodium hydroxide is used as aqueous solutions (its concentration being 30-50 mass %). Said solution is fed when starch and carboxymethyalted agent have been supplied. At the second step thus prepared mixture is fed into drying device where mixture is heated and allowed to stand within 0.5-3.0 h at 60-90 C. EFFECT: improved efficiency of the method. 5 cl, 1 tbl