Preparation method of acetylated lignocellulose

The invention provides an acetylated wood fiber preparation method, which comprises: (1) impregnating a wood fiber raw material with an alkaline salt solution, carrying out solid-liquid separation, and washing the solid to obtain an impregnation liquid and an impregnation material; and (2) mixing a glacial acetic acid solution with the impregnated material obtained in the step (1), and carrying out acetylation reaction under the action of a molecular sieve solid acid catalyst to obtain the acetylated wood fiber. According to the preparation method of the acetylated wood fiber, the acetyl content in the wood fiber can be increased, the acetyl substitution degree reaches 0.8, so that subsequent utilization of the acetylated wood fiber is facilitated. In addition, the method is easy to operate, and the consumption of an organic solvent is low. 本发明提供了一种乙酰化木质纤维的制备方法，所述制备方法包括如下步骤：(1)使用碱性盐溶液浸渍木质纤维原料，固液分离后对固体进行洗涤，得到浸渍液与浸渍料；(2)混合冰醋酸溶液与步骤(1)所得浸渍料，在分子筛固体酸催化剂的作用下进行乙酰化反应，得到乙酰化木质纤维。本发明提供的乙酰化木质纤维的制备方法能够提高木质纤维中乙酰基含量，使乙酰基取代度达