Citation: LI Wei, TANG Chu-qiao, XIE Xin-an, LI Yan, LI Lu, SUN Jiao, FAN Di, WEI Xing. Effects of N-tert-butyl-α-phenylnitrone on the product distribution of cellulose liquefaction in supercritical ethanol[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(1): 55-64. shu

Effects of N-tert-butyl-α-phenylnitrone on the product distribution of cellulose liquefaction in supercritical ethanol

College of Food Science, South China Agricultural University, Guangzhou 510640, China

Corresponding author: XIE Xin-an, xinanxie@scau.edu.cn
Received Date: 18 August 2016
Revised Date: 9 October 2016

Fund Project: National Natural Science Foundation of China 21576107National Natural Science Foundation of China 21176097and Guangdong Provincial Science and Technology Program Foundation of China 2014A010106024

Figures(7)

With N-tert-butyl-α-phenylnitrone (PBN) as free radicals trapper, the effects of PBN dosage and reaction temperature on the product distribution and bio-oil component distribution of cellulose liquefaction in supercritical ethanol were investigated using an autoclave. The results showed that the yields of bio-oil and volatile compounds were 37.17% and 50.08% without PBN, respectively; meanwhile the highest yield of bio-oil increased to 48.35%, whereas the volatile compound yield decreased to 35.65% with the PBN dosage increased from 0 to 0.4 g. With the increase of reaction temperature from 250℃ to 340℃, the cellulose conversion rate increased sharply from 23.10% to 88.92% while the bio-oil yield increased from 19.18% to 48.35% (320℃) and the volatile compound yield increased from 6.03% to 50.28% quickly. The GC-MS results showed that the dominant compounds in bio-oil were esters, ketones, alkanes, alcohols, acids and benzenes with the highest relative contents of 27.91%, 15.77%, 13.44%, 12.42%, 16.07% and 19.81%, respectively. The present results proved that PBN has obvious effects on the product distribution and bio-oil component distribution of cellulose liquefaction in supercritical ethanol, especially PBN can enhance the transformation between bio-oil and volatile compounds via reacting with benzyl radicals, methyl radicals, ethyl radicals, etc. The transformation among dominant compounds in bio-oil can be regulated by varying PBN dosage and reaction temperature.
- cellulose,
- liquefaction,
- supercritical ethanol,
- N-tert-butyl-α-phenylnitrone
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