水-四氢萘混合溶剂液化蔗渣的工艺研究  

Research on liquefaction process of bagasse in a water-tetralin mixed solvent

作　　者：操江飞 洪亚明 李冬明[1] 熊庭宋 沈芳[1] 李志霞[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2015年第3期519-526,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(21266002);广西自然科学基金资助项目(2013GXNSFFA019005);广西大学科研基金项目(XGZ120081);广西大学大学生实践技能和科技创新能力训练基金项目(SYJN20120320)

摘　　要：在间歇式高温高压反应釜中，以水、四氢萘、水-四氢萘混合溶剂为反应介质，研究了甘蔗渣直接液化制备生物油的工艺.调查了蔗渣/溶剂的固液比、液化温度、水-四氢萘混合溶剂中四氢萘含量、碱预处理对蔗渣液化效率的影响.研究结果表明，在液化温度200ц320℃范围内，单独使用水和四氢萘作为溶剂液化时最大转化率分别为68%和89%，最大液体产率分别为61%和70%，而且，水作为溶剂液化时，转化率随温度升高缓慢增加，而四氢萘液化时，在270ц280℃转化率急剧地增加（增加了30%）；当水-四氢萘混合溶剂中四氢萘含量大于50%时，蔗渣转化率均高于单独使用水或四氢萘液化，预示着水和四氢萘之间的协同作用；使用NaOH预处理蔗渣，大幅提高了以水和水-四氢萘混合溶剂为反应介质的转化率和液体产率.与蔗渣原料相比，液化产物显示了较低的氧含量（20.96%ц27.24%）与较高的热值（27.65ц30.82 MJ/kg），达到了对蔗渣脱氧和提高热值的目的.Direct liquefactions of bagasse with water, tetralin and water-tetralin （ W-T） mixture as medium were investigated in a batch-type autoclave. The effects of mass ratio of bagasse to solvent, temperature, tetralin content in W-T mixtures and pretreatment of bagasse with NaOH,on the lique-faction efficiency were studied. It was found that when liquefactions of bagasse were performed from 200ц320 ℃, the highest conversion was 68% and 89%, and the highest liquid yield was 61% and 70% for water and tetralin as medium, respectively. In addition, conversion with water as medium increased gradually with increasing temperature, while conversion with tetralin as medium increased significantly （ by 30%） at 270 ц280 ℃; When the content of tetralin in W-T mixtures was over 50 wt%, higher conversion was obtained with W-T mixtures as medium than with water or tetralin, indicating the existence of cooperative action between water and tetralin. Pretreatment of bagasse＆amp;nbsp;with NaOH improved greatly the conversion and liquid yield of bagasse with water and W-T mixtures as medium. Lower oxygen contents（20. 96%ц27. 24%） and higher heating values（32. 0ц34. 7 MJ/kg） in product oils demonstrated the effect of deoxygenation by present liquefaction process.

关 键 词：生物油 甘蔗渣 水-四氢萘混合溶剂 直接液化 液化效率 协同作用 

分 类 号：TQ353.3[化学工程]