The invention relates to a carboxymethylation modification method and applications of semi-
cellulose in waste liquor from
viscose fiber production. The modification method comprises the steps of: adding
monochloroacetic acid in a
raw material which is alkaliferous semi-
cellulose extracted from the waste liquor from
viscose fiber production, reacting for 120-180min at 70-90DEG C, cooling, standing, washing supernated liquor with 90%
ethanol, precipitating, and performing suction
filtration to obtain a crude product; dissolving the crude product into water, and performing
centrifugal separation; washing supernated liquor with 90%
ethanol, precipitating, filtering, performing
vacuum drying for 24h to obtain a carboxymethyl semi-
cellulose product. After being applied to dispersing agents of
coating, printing and
dyeing,
industrial water treatment and the like, the modified carboxymethyl semi-cellulose product has good adsorportion property, is low in usage amount and good in
dispersity. The alkaliferous semi-cellulose extracted from the waste
viscose fiber production liquor is subjected to carboxymethylation modification, the carboxymethylation modification method is simple in technology, easy to operate and low in production cost, the hydrophilicity of the modified semi-cellulose is greatly improved, the application performance is good, and the waste liquor
pollution and the semi-cellulose
plant resource reutilization problems can be reasonably solved.