Natural cellulose is the most widely distributed and abundant polysaccharide in nature, with rich sources. At present, the modification technology of cellulose mainly focuses on etherification and esterification. Carboxymethylation is one of the etherification technologies. Carboxymethyl cellulose (CMC) is obtained from cellulose after carboxymethylation. Its aqueous solution has the functions of thickening, film formation, adhesion, water retention, colloid protection, emulsification and suspension. It is widely used in oil, food, medicine, textile and paper industries, and is one of the most important cellulose ethers.
