甘蔗渣在水与四氢萘混合溶剂中的液化工艺优化实验

摘要

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。%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.