The invention provides a production method for high-
viscosity high-purity
sodium carboxymethylcellulose by using bamboo pulp as a
raw material. The production method comprises the following steps of: carrying out an alkalization reaction and an etherification reaction to 5 parts of bamboo pulp by weight (the same below), 100 parts of 90% of
ethanol aquifer based on volume by
volume concentration, 5 to 8 parts of 30% of
sodium hydroxide aqueous solution based on
mass by
mass concentration, and 7 to 10 parts of
chloroacetic acid at an industrial level; washing via
ethanol; pressing and filtering; parching; and crushing to obtain the finished product. The production method provided by the method is the first one to produce high-
viscosity high-purity
sodium carboxymethylcellulose through
raw material with a low content of alpha-
cellulose and a low
degree of polymerization, and according to the high-
viscosity high-purity
sodium carboxymethylcellulose, the viscosity is more than 5000 mPas, and the purity is less than or equal to 0.1% based on the
mass fraction of the
chloride Cl. The production method is rich in
raw material resources with low cost, so that the cost of production is greatly reduced. The reaction medium is hydrous
ethanol and the washing
solvent is the hydrous ethanol as well, so that problem of blending various organic solvents for use can be avoided, and the complex process for respectively recovering is saved. The production method has few processes, is energy-saving, time-saving and labor-saving, and has low production cost.