Subcritical Water Extraction of Huadian Oil Shale under Isothermal Condition and Pyrolysate Analysis

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• 作者：Zhijun Wang ; Sunhua Deng ; Qiang Gu ; Xuejun Cui ; Yumin Zhang ; Hongyan Wang
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：April 17, 2014
• 年：2014
• 卷：28
• 期：4
• 页码：2305-2313
• 全文大小：372K
• 年卷期：v.28,no.4(April 17, 2014)
• ISSN：1520-5029

文摘

Isothermal subcritical water extraction technique was used to extract organic matters from Huadian oil shale under different extraction conditions. The effects of particle size, extraction temperature, extraction time, and water鈥搊il shale mass ratio were investigated on the extracts yield. A series of extraction experiments were carried out with three particle size samples and the water鈥搊il shale mass ratio in the range 1.5鈥?.5 at five levels of temperature for 5鈥?0 h. As a result, extraction temperature and extraction time were found to have large effect on the extracts yield, and the particle size had large effect on the extracts yield at 335 掳C. The maximum extracts yield could be obtained at 365 掳C for 30 h with the water鈥搊il shale mass ratio of 3 using middle particle size oil shale samples. Gas chromatography鈥搈ass spectrometry (GC-MS) analysis of the n-hexane-soluble maltene in bitumen 1 and the organic matters in the spent aqueous solution demonstrated that large molecular hydrocarbons could be cracked into smaller hydrocarbon compounds with the extending of extraction time. The elemental analysis of the bitumen 1 showed that the atomic H/C reached the maximum value of 1.82 wt % when the extraction time was 15 h. The analysis results of the pyrolysate indicated that subcritical water played the roles of catalytic pyrolysis and extraction solvent during extraction process.