Sequential Extraction and Thermal Dissolution of Baiyinhua Lignite in Isometric CS2/Acetone and Toluene/Methanol Binary Solvents

详细信息    查看全文

• 作者：Yun-Peng Zhao ; Jian Xiao ; Man Ding ; Eric G. Eddings ; Xian-Yong Wei ; Xing Fan ; Zhi-Min Zong
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：January 21, 2016
• 年：2016
• 卷：30
• 期：1
• 页码：47-53
• 全文大小：331K
• ISSN：1520-5029

文摘

Baiyinhua lignite (BL) was sequentially extracted and thermally dissolved in isometric CS₂/acetone and toluene/methanol binary solvents to obtain an extract in isometric CS₂/acetone (E_ICA) and a soluble portion (SP) in isometric toluene/methanol (SP_ITM). The yields of E_ICA and SP_ITM are notably higher than the total extract yield from sequential extraction with CS₂ and acetone (or acetone and CS₂) and the total SP yield from sequential thermal dissolution in toluene and methanol (or methanol and toluene), indicating that there exists an obvious synergic effect between CS₂ and acetone during the extraction and between toluene and methanol during the thermal dissolution. E_ICA and SP_ITM mainly consist of hydrocarbons and oxygen-containing organic species, respectively. Little difference in Fourier transform infrared spectroscopy spectra of BL and its extraction residue was observed, while the intensities of absorbances assigned to the phenolic OH, C═O, and C–O/C–O–C groups of the thermal dissolution residue are obviously lower than those of BL and its extraction residue. X-ray photoelectron spectroscopy analysis shows that C–O/C–O–C groups in BL remarkably decreased after thermal dissolution, corresponding to the abundant phenols dissolved in SP_ITM. The difference in weight loss between BL and its extraction residue is close to the yield of E_ICA, while the difference in weight loss between extraction and thermal dissolution residues is significantly lower than the yield of SP_ITM.