High Value-added Utilization of Cellulose: Microcrystalline Cellulose Preparation

Application of metal Fe3 +catalytic acid hydrolysis,separation and purification to prepare crude microcrystalline cellulose from dissolving pulp was introduced. The optimal dilute acid hydrolysis concentration and Fe3 +concentration were determined,and a preliminary analysis was carried out on the ingredients of hydrolysis residual liquid. The optimal hydrolysis parameters were: hydrolysis temperature 80℃, Fe3 +concentration 0. 3 mol / L,hydrolysis time 60 min,and hydrochloric acid concentration 2. 0 mol / L. The results showed that the main composition of MCC was cellulose with crystalline structure ofⅠtype,the crystallinity was 73. 0%,which increased by 18. 2 percentage points compared with raw material 54. 8%,and the degree of polymerization reduced to around 100; and the weighted mean length of MCC distribution was between 200 ~ 400 μm; the yield of reducing sugar in the hydrolysis residual liquid was 1. 56%.