Solvent Extraction for Bitumen Recovery from Oil Sands Assisted with Imidazole Ionic Liquids

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Abstract

Six kinds of ionic liquids (ILs) with anion of BF₄^- and cation of 1-alkyl-3-methylimidazole were applied to extract bitumen from oil sands as additive agent combined with toluene or acetone/heptane composite solvent. The effect of the carbon chain length of the 1-position imidazole ring on the extraction of bitumen and solid entrainment was investigated. The results demonstrate that the extraction ratios are reduced with the increase of the length of 1-position carbon chain of cation in both acetone/heptane and toluene systems. The extraction ratio is reduced from 9.29% to 8.55% in acetone/heptane composite solvent system, and reduced from 10.05% to 9.45% in toluene system. But, in both systems, the extraction ratio assisted with ionic liquids of which 1-positon carbon chain is n-butyl was higher than that of which 1-position carbon chain is n-propyl. In addition, the FTIR spectrum results indicate that assisted with the 6 kinds of ILs, much less clay fines in the recovered bitumen are found than that using toluene extraction alone.

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	Yin Wentao
	Sui Hong

Keywords： oil sands； ionic liquids； toluene； composite solvent； extraction ratio； clay fines entrainment

Received 2015-05-11;

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Yin Wentao, Sui Hong.Solvent Extraction for Bitumen Recovery from Oil Sands Assisted with Imidazole Ionic Liquids[J] Chemcial Industry and Engineering, 2017,V34(4): 55-61

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