Preparation method of acetyl citric acid cellulose ester

The invention relates to a preparation method of acetyl citric acid cellulose ester, which comprises the following steps: by taking jute as a raw material, carrying out crushing, alkali treatment, bleaching, centrifuging and drying, adding the pretreated jute fiber into a mixed solution of hydrochloric acid and citric acid to carry out hydrolysis carboxylation modification, and then reacting acetic anhydride as an acylation reagent with carboxylated nano cellulose to obtain the acetyl citric acid cellulose ester. The acetyl citric acid cellulose ester is obtained at room temperature. Hydroxyl groups on cellulose C6 and citric acid are subjected to a cross-linking esterification reaction, acetic anhydride is used as an acylation reagent, and hydroxyl groups in citric acid cellulose molecules are acetylated and then sealed, so that the hydrophobicity of nano cellulose is improved, and the interfacial compatibility with degradable biopolyester is enhanced. The preparation process is green and environment-friendl