期刊论文详细信息
International Journal of Molecular Sciences
On the Extraction of Aromatic Compounds from Hydrocarbons by Imidazolium Ionic Liquids
Cláudia C. Cassol1  Alexandre P. Umpierre1  Günter Ebeling1  Bauer Ferrera2  Sandra S. X. Chiaro2 
[1] Laboratory of Molecular Catalysis, Institute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS Brazil; E-mail:;PETROBRAS Research Center - CENPES-PETROBRAS, Hydrorefining and Special Processes, Av. Prof. Horácio Macedo, 950 Ilha do Fundão, Rio de Janeiro, 21941-598 RJ, Brazil
关键词: ionic liquid;    extraction;    fuel;    aromatics;    hydrogen bonds;   
DOI  :  10.3390/i8070593
来源: mdpi
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【 摘 要 】

The liquid-liquid equilibrium for the ternary system formed by n-octane and aromatic (alkylbenzenes) and heteroaromatic compounds (nitrogen and sulfur containing heterocyles) and 1-alkyl-3-methylimidazolium ionic liquids (ILs) associated with various anions has been investigated. The selectivity on the extraction of a specific aromatic compound is influenced by anion volume, hydrogen bond strength between the anion and the imidazolium cation and the length of the 1-methyl-3-alkylimidazolium alkyl side chain. The interaction of alkylbenzenes and sulfur heterocyles with the IL is preferentially through CH-π hydrogen bonds and the quantity of these aromatics in the IL phase decreases with the increase of the steric hindrance imposed by the substituents on the aromatic nucleus. In the case of nitrogen heterocycles the interaction occurs preferentially through N(heteroaromatic)-H(imidazolium) hydrogen bonds and the extraction process is largely controlled by the nitrogen heterocycle pKa. Competitive extraction experiments suggest that benzene, pyridine and dibenzothiophene do not compete for the same hydrogen bond sites of the IL.

【 授权许可】

Unknown   
© 2007 by MDPI (http://www.mdpi.org)

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