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 EN

This work investigates the ability of 1-ethyl-3-methylimidazolium ethylsulphate ([emim][EtSO4]) 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][EtSO4](1) + pyridine(2), [emim][EtSO4](1)+ pyrrole(2), [emim][EtSO4](1) + quinoline(2), [emim][EtSO4](1) + indoline(2), [emim][EtSO4](1) + thiophene(2), and [emim][EtSO4](1) + water(2) over the entire mole fraction of [emim][EtSO4] 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][EtSO4] ionic liquid.

The surface tension values were found to increase while the refractive index decrease with increasing mole fraction of [emim][EtSO4].

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][EtSO4] has a greater influence than temperature in deciding the densities, surface, optical, and thermodynamic properties.