| abstract |
The invention provides a method for preparing cellulose ether with low crystallinity and high degree of substitution by adopting a one-pot method. The reaction is carried out with an etherifying agent, and after the reaction is completed, solid-liquid separation is performed, and the solid is washed and desalted to obtain cellulose ether with low crystallinity and high degree of substitution, and the yield is 85-95% of the cellulose raw material. The pulp concentration of the cellulose raw material in the molten salt hydrate is 1-20wt%, and the consumption of the alkali is 3-10wt% of the cellulose raw material. The amount of the etherifying agent is 1.5-20 times the weight of the cellulose raw material; the molten salt hydrate is a binary composite molten salt hydrate. The preparation method greatly reduces the dosage of alkali metal hydroxide, reduces the cost of recovery of alkali metal hydroxide, and avoids severe degradation of cellulose in a concentrated alkali environment, thereby improving the degree of substitution of cellulose ether. And yield, solve the technical problems in actual production, the market value is huge. |