Preparation method of high-transparency sodium carboxymethyl cellulose

The invention relates to the field of sodium carboxymethyl cellulose production, in particular to a preparation method of high-transparency sodium carboxymethyl cellulose, which comprises the following steps: (1) treating wood pulp powder to remove hemicellulose in the wood pulp powder to obtain pure cellulose; (2) carrying out alkalization reaction on the obtained cellulose in a sodium hydroxide solution containing ethanol to obtain alkaline cellulose; (3) performing etherification reaction on the alkaline cellulose to obtain high-transparency sodium carboxymethyl cellulose; in the step (2), glucose chains in the cellulose are broken in order under the catalytic action of oxygen and a photocatalyst. According to the method, the raw material wood pulp powder is purified, so that the purity of the sodium carboxymethyl cellulose is improved, meanwhile, the molecular weight and molecular weight distribution of the sodium carboxymethyl cellulose are controlled, and the transparency of the sodium carboxymethyl cel