Liquid-Liquid Equilibrium Data in Ionic Liquid+4-Methyldibenzothiophene plus n-Dodecane Systems

Author(s)

de Oliveira, Leonardo Hadlich ^[1] ; Aznar, Martin ^[1]

Affiliation

^[1] Univ Estadual Campinas, Sch Chem Engn, BR-13083852 Campinas, SP - Brazil

• Document type: Journal article
• Source: Industrial & Engineering Chemistry Research; v. 49, n. 19, p. 9462-9468, OCT 6 2010.
• Web of Science Citations: 3

Abstract

In this work, liquid-liquid equilibrium data for 1-ethyl-3-methylimidazolium diethylphosphate ({[}emiml{[}DEtPO(4)]) or 1-ethyl-3-methylimidazolium ethylsulfate ({[}emim]{[}EtSO(4)]) + 4-methyl-dibenzothiophene (4-MDBT) + n-dodecane systems at 25 and 40 degrees C and atmospheric pressure (approximate to 95 kPa) were determined by refractometry. 4-MDBT is a DBT derivative and it is one of the most difficult diesel sulfur pollutants to remove by the conventional process of hydrodesulfurization. The liquid-liquid equilibrium data were used to study the 4-MDBT extraction from n-dodecane as model diesel oil. 4-MDBT distribution coefficients, solvent selectivities, and extraction data also indicate that {[}emim]{[}DEtPO(4)] is a better solvent for extractive desulfurization of n-dodecane than {[}emim]{[}EtSO(4)]. For a solvent/n-dodecane mass ratio of 0.6, the sulfur content in n-dodecane decreases 17-24% and 5-15% for {[}emim]{[}DEtPO(4)] and {[}emim]{[}EtSO(4)]. respectively. The quality of the data was ascertained by the Hand and Othmer-Tobias correlations, which presented R(2) > 0.97 for all systems. The NRTL model was used to correlate the data and showed root-mean-square deviations of <0.15%. (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