Physiochemical Properties of Hydrodenitrification and Hydrodesulphurization Inhibiting Compounds with 1‐Ethyl‐3‐Methylimidazolium Ethylsulphate at T = (298.15 to 323.15) K and p = 1 Bar

Abstract

This work investigates the ability of 1‐ethyl‐3‐methylimidazolium ethylsulphate ([emim][EtSO 4 ]) as a green and tuneable solvent for denitrification and desulphurization of diesel oil. Experimental density, surface tension, and refractive index data have been measured for the following systems: [emim][EtSO 4 ](1) + pyridine(2), [emim][EtSO 4 ](1)+ pyrrole(2), [emim][EtSO 4 ](1) + quinoline(2), [emim][EtSO 4 ](1) + indoline(2), [emim][EtSO 4 ](1) + thiophene(2), and [emim][EtSO 4 ](1) + water(2) over the entire mole fraction of [emim][EtSO 4 ] at temperatures of (298.15 to 323.15) K and at atmospheric pressure. Further, from experimental density values, coefficient of thermal expansivity and excess molar volume were also calculated. It was found that the heteroaromatic nitrogen/sulphur compounds and water are completely miscible in the [emim][EtSO 4 ] ionic liquid. The surface tension values were found to increase while the refractive index decrease with increasing mole fraction of [emim][EtSO 4 ]. On the other hand, dissimilar molecule such as water showed mobility of ions on mixing resulting in lower surface tension. The experimental values of surface tension increased in the order: thiophene > pyridine > pyrrole > indoline > quinoline and for refractive index: quinoline > indoline > pyrrole > pyridine > thiophene > water. It was found that the composition of [emim][EtSO 4 ] has a greater influence than temperature in deciding the densities, surface, optical, and thermodynamic properties.