Solvent Selection for Extractive Distillation Separation of the Methanol-Butanone Azeotrope System

化学工业与工程

Chemcial Industry and Engineering

2015, Vol. 32

Issue (5) :92-97 DOI: 10.13353/j.issn.1004.9533.2015.05.011

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Solvent Selection for Extractive Distillation Separation of the Methanol-Butanone Azeotrope System

Zhang Qinqin, Pan Fenjin, Zhang Aidi, Li Wenxiu

Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 110142, China

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Abstract

To separate the methanol-butanone azeotrope system in industrial production, three ionic liquids (ILs), namely, N-ethylpyridinium bromide ([EPy][Br]), N-butylpyridinium bromide ([BPy][Br]) and N-hexylpyridinium bromide ([HPy][Br]), were synthesized by one-step method and used as entrainers. The selectivities of the three ILs for the methanol-butanone azeotrope system were measured at 101.3 kPa, the effects of solvent ratios on their selectivities were studied,and the separation effect of ionic liquids was compared with that of organic solvents. The results showed that all the three ILs could improve the relative volatility of methanol to butanone, their selectivities followed the order: [EPy][Br]> [BPy][Br]> [HPy][Br], and their selectivities increased with increasing solvent ratios. What is more, compared with organic solvents, ionic liquids showed significant advantages as extractive solvents. Thus, [EPy][Br] can be a promising entrainer to the separation of the methanol-butanone azeotrope system.

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	Articles by authors
	Zhang Qinqin
	Pan Fenjin
	Zhang Aidi
	Li Wenxiu

Keywords： methanol； butanone； ionic liquids； extractive solvent； selectivity

Received 2015-07-15;

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Zhang Qinqin, Pan Fenjin, Zhang Aidi, Li Wenxiu.Solvent Selection for Extractive Distillation Separation of the Methanol-Butanone Azeotrope System[J] Chemcial Industry and Engineering, 2015,V32(5): 92-97

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