Citation: SUN Meng-chao, YUAN Xin-hua, LUO Ze-jun, ZHU Xi-feng. Influence of heating temperatures on the component distribution of distillates derived from walnut shell bio-oil[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(10): 1179-1185. shu

Influence of heating temperatures on the component distribution of distillates derived from walnut shell bio-oil

School of Engineering Science, University of Science and Technology of China, Hefei 230026, China

Corresponding author: ZHU Xi-feng, xfzhu@ustc.edu.cn
Received Date: 13 August 2020
Revised Date: 16 September 2020

Fund Project: the National Key Research and Development Program of China 2018YFB1501404The project was supported by the National Key Research and Development Program of China (2018YFB1501404)

Figures(6)

Influence of heating temperatures on the component distribution of distillates distilled from walnut shell bio-oils was studied. Meanwhile, distillates were further separated into water-soluble and water-insoluble fraction to characterize product distribution. The results showed that distillate fraction yield increased with strengthening heating temperature from 120 to 300 ℃. Aromatic hydrocarbons (e.g. naphthalene) and carboxylic acids (e.g. acetic acid) significantly concentrated in water-insoluble fraction as heating temperatures were below 240 ℃. Notably, the relative concentration of aromatic and carboxylic compounds in the water-insoluble fraction derived from 300 ℃ was 13.86 and 3.15 times higher than that of crude bio-oil, respectively. Large amounts of phenols such as phenol and guaiacol was distilled as heating temperatures exceeded 240 ℃, which induced enhanced yield of water-insoluble fraction. Moreover, the moisture of all the water-soluble fractions was higher than 60%, which demonstrated the water-soluble fraction remarkably concentrated moisture. In addition, undetected components (e.g. butyl 2-ethylacetate and cyclopentanone) in crude bio-oil surprisingly existed in distillates and the total moisture of distillates was higher than that of crude bio-oils, which proved esterification and polycondensation reactions occurred in bio-oil distillation process. Furthermore, the component distribution of distillates also indicated modifying heating temperatures effectively enriched commodity chemicals. Note that water-insoluble fraction distilled from 300 ℃ exhibited relative concentration of phenol, guaiacol, 4-methyl-2-methoxyphenol, 4-ethyl-2-methoxyphenol and 4-propyl-2-methoxyphenol was 109%, 160%, 84%, 53% and 444% higher than that in crude bio-oil, respectively.
- bio-oil,
- atmospheric distillation,
- separation,
- phenols enrichment
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