微晶纤维素在甲酸体系中的水解试验研究

The Study on Hydrolysis of Microcrystalline Cellulose in Formic Acid System

主要研究了微晶纤维素在甲酸体系中的水解动力学。探讨了甲酸体系中盐酸质量分数、微晶纤维素加入量、反应温度、反应时间对微晶纤维素水解的影响。分析了在该体系中葡萄糖的降解情况,结果表明葡萄糖的降解反应与纤维素的水解反应相比是个快速反应。微晶纤维素在甲酸体系中的水解速率55℃时为6.34×10-3h-1,65℃时为2.94×10-2h-1,75℃时为6.84×10-2h-1。葡萄糖的降解速率55℃时为0.01 h-1,65℃时为0.14 h-1,75℃时为0.34 h-1。微晶纤维素水解的表观活化能为105.61 kJ/mol,葡萄糖的降解表观活化能131.37 kJ/mo。

The hydrolysis kinetics of microcrystalline cellulose in formic acid system was studied. The effects of mass fraction of hydrochloric acid, dosage of MCC, temperature （55-75 ℃ ） and time （0-9 h） were discussed. The degradation of glucose was also studied. The result indicated that the degradation of glucose was a fast reaction and the velocities of MCC hydrolysis were 6.34 × 10 ^-3 h^-1 at 55 ℃, 2.94 × 10^-2 h^-1 at 65 ℃, 6.84 × 10^-2 h^-1 at 75 ℃. The velocities of glucose degradation were 0.01 h^-1 at 55℃, 0.14h^-1 at 65℃, 0.34h^-1 at 75℃. The apparent activation energy of MCC hydrolysis was 105.61 kJ/mol and the apparent activation energy of glucose degradation was 131. 370 kJ/mol.