燃料化学学报2016，Vol.44Issue(4)：415-421,7.
亚/超临界乙醇中羟基和氢自由基作用下的纤维素液化行为
Effects of hydroxyl and hydrogen free radicals on the liquefaction of cellulose in sub/supercritical ethanol
摘要
Abstract
With salicylic acid as hydroxyl radical ( HO·) trap and carbon tetrachloride as hydrogen radical ( H·) trap, the effects of HO· and H· radicals on the liquefaction of cornstalk cellulose in sub/supercritical ethanol was investigated in an autoclave. The results indicated that the concentration of HO· radical increases with the increase of salicylic acid amount added in the feed from 0 to 4 mL; meanwhile, the bio-oil yield is increased from 29 . 3% to 47 . 9%, whereas the residue yield is decreased from 26 . 7% to 24 . 3%. The activity of HO· increases with the increase of reaction temperature from 250 to 320 ℃; meanwhile, the bio-oil yield is increased from 35 . 9% to 58 . 2%, whereas the residue yield is reduced from 51 . 8% to 20 . 4%. On the other hand, the concentration of H· radical decreases with the increase of carbon tetrachloride from 0 to 2 mL;meanwhile, the bio-oil yield is decreased from 24. 7% to 20. 7%, whereas the residue yield is increased from 54 . 1% to 59 . 1%. The liquefaction of cellulose is enhanced within 30 min due to the increase of H· activity;after that, the bio-oil yield begins to decline due to the inhibition of H· activity by CCl4 . Current results proved that ethanol can produce HO· and H· radicals under sub/supercritical state; the concentration and activity of HO· and H· radicals are dependent on the reaction conditions, which may determine the product yield and distribution for the liquefaction of cellulose in sub/supercritical ethanol.关键词
纤维素/液化/亚/超临界乙醇/自由基/自由基捕捉剂Key words
cellulose/liquefaction/sub/supercritical ethanol/free radical/radical trap分类
能源科技引用本文复制引用
黎巍,解新安,汤成正,李雁,李璐,王娅莉,魏星,樊荻..亚/超临界乙醇中羟基和氢自由基作用下的纤维素液化行为[J].燃料化学学报,2016,44(4):415-421,7.基金项目
The project was supported by the National Natural Science Foundation of China(21576107,21176097) and Guangdong Provincial Science and Technology Program Foundation of China(2014A010106024).@@@@国家自然科学基金(21576107,21176097)和广东省科技计划项目(2014A010106024)资助 （21576107,21176097）
