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Chemistry and Industry of Forest Products ›› 2014, Vol. 34 ›› Issue (6): 29-36.doi: 10.3969/j.issn.0253-2417.2014.06.005

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Vacuum Pyrolysis of Camphorwood Sawdust Optimized by Response Surface Methodology and Bio-oil Composition Analysis

FAN Yong-sheng1, CAI Yi-xi1, LI Xiao-hua1, YU Ning1, ZHANG Rong-xian2, YIN Hai-yun1   

  1. 1. School of Automotive and Traffic Engineering, Jiangsu University Zhenjiang, 212013, China;
    2. School of Chemistry and Chemical Engineering, Jiangsu University Zhenjiang, 212013, China
  • Received:2013-10-08 Online:2014-12-25 Published:2015-08-18

Abstract: Camphorwood sawdust from industrial processing was treated by vacuum pyrolysis for bio-oil preparation. The response surface methodology (RSM) was employed to optimize the process for maximum yield of bio-oil. All factors that affected bio-oil yield, including pyrolysis temperature, reaction pressure and heating rate, were investigated. Furthermore, the physicochemical properties of the bio-oil obtained from vacuum pyrolysis at the optimal conditions were evaluated. The chemical composition was also examined using Fourier transform infrared (FT-IR) and gas chromatograph/mass spectroscopy (GC-MS). The results showed that these three factors had obvious effects on bio-oil yield. However, the interaction between them was not remarkable. The optimal conditions for bio-oil yield were pyrolysis temperature 474.0 ℃, reaction pressure 7.5 kPa and heating rate 20.0 ℃/min. At this condition, the bio-oil yield could reach 50.25% close to 50.41%—the predicted value. Water content and high heat value of bio-oil was 21.35% and 26.82 MJ/kg, and its dynamic viscosity at room temperature, density, pH value and carbon residue content were 3.85 mm2/s, 1.08 g/cm3, 3.24 and 5.54%, respectively. Bio-oil from camphorwood sawdust was a complex mixture, which involve aromatics (26.30%), alcohols (12.14%), carboxylic acids (8.45%), aldehydes (26.17%), ketones (14.24%) and esters (1.18%). It also contained some specific organic compounds, which could be further extracted for industrial raw materials. Further study on enhancing the properties of bio-oil should be performed to ensure economic feasibility in future.

Key words: camphorwood, vacuum pyrolysis, response surface methodology (RSM), bio-oil, composition analysis

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