甘蔗渣在水与四氢萘混合溶剂中的液化工艺优化实验

通过正交试验考察了蔗渣在水与四氢萘混合溶剂中液化过程的5个因素对蔗渣转化率的影响.蔗渣在混合溶剂中的优化工艺为:反应温度270 ℃、反应时间30 min、固液比(蔗渣与溶剂质量比)1:6、碱浸预处理NaOH用量4%、四氢萘用量(占总溶剂质量分数)50%.各因素的影响次序:NaOH用量>反应温度>四氢萘用量>固液比>反应时间.在此工艺条件下,蔗渣转化率可达到97.9%.实验结果表明,四氢萘部分取代液化溶剂中的水,可以有效提高蔗渣液化效率,同时降低反应温度及压力,促进实验操作条件的改善.

Optimization of Liquefaction Technology of Bagasse in Water-tetralin Mixed Solvents

The effects of five factors on conversion rate during the liquefaction of bagasse in water-tetralin (W-T) mixed solvents were investigated by orthogonal test.The optimal conditions were reaction temperature 270 ℃, reaction time 30 min,mass ratio of bagasse to solvent 1:6,NaOH dosage in alkali-soaking pretreatment 4%, and tetralin dosage 50%(mass fraction in the total solvent). The sequence of influence factors was NaOH dosage>reaction temperature>tetralin dosage>mass ratio of bagasse to solvent>reaction time.The conversion rate of bagasse was 97.9% under the optimal conditions.The results also showed that partial substitute for water with tetralin in liquefaction solvents could increase liquefaction efficiency,reduce reaction temperature and pressure,and improve experimental operating condition.