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(s)

de Oliveira, Leonardo Hadlich ; Aznar, Martin

• Document type: Journal article
• Source: JOURNAL OF CHEMICAL AND ENGINEERING DATA; v. 56, n. 5, p. 8-pg., 2011-05-01.

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. (AU)

• FAPESP's process: 07/53024-3 - Thermodynamic study of liquid-liquid equilibrium aiming sulfur removal from diesel oil by using ionic liquids
• Grantee: Leonardo Hadlich de Oliveira
• Support Opportunities: Scholarships in Brazil - Master