Citation: LI Wei, LIU Zhi-wei, XIE Xin-an, SUN Jiao, FAN Di, WEI Xing. Effects of diphenylethene on products produced during cornstalk cellulose liquefaction in supercritical ethanol[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(9): 1064-1073. shu

Effects of diphenylethene on products produced during cornstalk cellulose liquefaction in supercritical ethanol

College of Food Science, South China Agricultural University, Guangzhou 510642, China

Corresponding author: XIE Xin-an, xinanxie@scau.edu.cn
Received Date: 19 April 2017
Revised Date: 1 July 2017

Fund Project: Guangdong Provincial Science and Technology Program Foundation of China 2014A010106024National Natural Science Foundation of China 21576107The project was supported by the National Natural Science Foundation of China (21576107) and Guangdong Provincial Science and Technology Program Foundation of China (2014A010106024)

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With 1, 1-diphenylethene (DPE) as the polymerization inhibitor, the effects of DPE concentration (dosage) and reaction temperature on the active fragments transforming to liquefaction products during cellulose liquefaction in supercritical ethanol were investigated using an autoclave. As the DPE concentration increases, the yield of volatile compounds decreases by 25.4%, while the yield of bio-oil increases to 39.8%, and the cellulose conversion rate decreases gradually. With the increasing of reaction temperature, the cellulose conversion rate reaches to 85.5% sharply and the volatile compounds also increases fastly, but the maximum bio-oil yield drops to 34.6%. GC-MS analysis shows that ketones, esters, alkanes, alcohols, acids and the DPE derivatives are dominant platform chemicals in the bio-oil. A lot of active fragments (such as CH₃CH₂-, HO-, H-, CH₃-, etc.) produced from cellulose pyrolysis in supercritical ethanol are trapped by a higher concentration of DPE to form DPE derivatives, which has a strong steric effect on the fragments transforming to platform chemicals. With the increasing of temperature, the enhanced pyrolysis of cellulose by ethanol radicals is more significant in comparison with the inhibition of DPE, resulting in an improvement in the content of platform chemicals.
- diphenylethene,
- cornstalk cellulose,
- supercritical ethanol,
- liquefaction,
- platform chemicals
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