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Type: Artigo de periódico
Title: Liquid-Liquid Equilibria for {1-Ethyl-3-methylimidazolium Diethylphosphate or 1-Ethyl-3-methylimidazolium Ethylsulfate}+4,6-Dimethyldibenzothiophene plus Dodecane Systems at 298.2 K and 313.2 K
Author: de Oliveira, LH
Aznar, M
Abstract: Liquid-liquid equilibrium (LLE) data for {1-ethyl-3-methylimidazolium diethylphosphate ([emim][DEtPO4]) or 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4])} +/- 4,6-dimethyl-dibenzothiophene (4,6-DMDBT) + dodecane systems, at (298.2 and 313.2) K and atmospheric pressure (approximate to 95 kPa), were determined by refractometry. 4,6-DMDBT is one of the most difficult diesel sulfur pollutants to remove by the conventional process of hydrodesulfurization (HDS). Extraction of 4,6-DMDBT from dodecane (used as model diesel oil) was analyzed in terms of solute distribution coefficient, solvent selectivity, and percent of extraction. The results indicate that [emim][DEtPO4] is a better solvent for extractive desulfurization of dodecane than [emim][EtSO4]. The Hand and Othmer-Tobias correlations, used to ascertain the quality of the experimental data, presented R-2 > 0.98 for systems with [emim][DEtPO4] and R-2 > 0.96 for systems with [emim][EtSO4]. The nonrandom two-liquid (NRTL) model was used to correlate the LLE data and showed root-mean-square deviations between experimental and calculated mole fractions 0.0002.
Country: EUA
Editor: Amer Chemical Soc
Rights: fechado
Identifier DOI: 10.1021/je100991y
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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