亚/超临界乙醇液化秸秆纤维素解聚反应研究与机理初探  

Depolymerization of stalk cellulose during its liquefaction in sub-and supercritical ethanol

作　　者：郑朝阳[1] 解新安[1] 陶红秀[1] 郑璐丝[1] 李雁[1] 

机构地区：[1]华南农业大学食品学院,广东广州510641

出　　处：《燃料化学学报》2012年第5期526-532,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21176097);广东省科技计划国际合作项目(2009B050700037)

摘　　要：利用间歇式高压反应釜,在反应温度200～330℃、乙醇用量0～150 mL条件下,考察了亚/超临界乙醇直接液化秸秆纤维素的解聚行为,并初步探讨了其液化机理。结果表明,反应温度、乙醇用量和反应停留时间对秸秆纤维素的液化均有显著影响,反应温度由200℃升高至330℃,重油和气体收率分别增加了12.55%、28.83%;乙醇用量增加,反应压力随之升高,乙醇进入超临界状态,残渣和气体收率相比单纯热裂解分别降低11.10%和8.44%。通过GC/MS、FT-IR分析生物油组分和残渣特性,表明秸秆纤维素在亚/超临界乙醇中断键裂解,且酮类和乙酯类化合物是生物油的主要成分。Direct liquefaction of cornstalk cellulose in sub-/super-critical ethanol was investigated with a batch reactor at 200~330℃ and an initial usage of ethanol varying from 0 to 150mL.The results show that the reaction temperature,ethanol quantity and retention time significantly influence the direct liquefaction of cornstalk cellulose.The yields of heavy oil and gases increase by 12.55% and 28.83% respectively,depending on reaction temperature from 200 to 330℃.The reaction pressure increases with the increment of ethanol,and the yield of residues and gases reduces by 11.10% and 8.44% in supercritical ethanol compared with that from thermal cracking without ethanol.The FT-IR analyses for residues and GC/MS measurements for the oils reveal that cornstalk cellulose was liquefied through deploymerization in supercritical ethanol,and the main components of oils are ketone and ethyl ester and their derivatives.

关 键 词：亚/超临界乙醇 秸秆纤维素 解聚 液化机理 

分 类 号：TK6[动力工程及工程热物理—生物能]