摘要
在 1 0 0ml半连续固定床萃取反应器中 ,利用非等温实验技术 ,对大连地区的玉米、大豆和高粱 3种生物质秸秆在水中的液化反应进行研究。实验采用 4因素 3水平的正交设计考察了压力、溶剂流量、升温速率及原料等因素对生物质秸秆在水中的液化反应行为。实验结果表明 ,在整个液化过程中始终存在着裂解与缩聚反应的竞争 ,在前期以裂解为主 ,后期以缩合为主 ,而发生这一转折的时间在很大程度上受到反应条件的综合影响。在实验条件下 ,以总收率为考察目标时最佳工艺条件是采用玉米秸秆为液化原料 ,升温速率 4K/min ,压力在 2 0MPa,溶剂流量为 1ml/min,此时秸秆的干基总收率为 87.0 % ,液体收率 58.6 %。研究发现水在临界点附近表现出了较好的反应特性 。
Liquefaction of three kinds of biomass (corn straw, durra straw and legume straw) was investigated in a semi continuous fixed bed with a non isothermal fluid extraction technique. The experiments were carried out in aqueous solution, under different conditions of pressure, heating rate and flow rate of solvent without any addition of catalyst or hydrogen. The results indicates that the cracking and condensation reactions coexist during the liquefaction process and cracking plays a important role at low temperature while condensation dominates at high temperature which mainly depends on reaction conditions. The type of biomass affects the liquefaction for their different content of cellulose, hemi-cellulose and lignin. The highest conversion (87.0%daf) is obtained with corn straw at a heating rate of 4?K/min, 20?MPa and flow rate of 1?ml/min . Those experiments show that water is a great potential solvent and reactant in dealing with biomass to obtain liquid products at high pressure and an appropriate temperature.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
2002年第5期59-62,共4页
Journal of Sichuan University (Engineering Science Edition)
基金
高等学校博士学科点专项科研基金资助项目 ( 2 0 0 0 )
