A PROPER EVALUATION OF INTERACTION BETWEEN SOLVENT AND THIOPHENE FROM THE MIDDLE DISTILLATION FRACTION OF OIL THROUGH EXTRACTION

摘要

The trend for limiting the sulphur content in transportation fuels, due to environmental pollution, is gradually declining. The price of crude oil, the major backbone of a developed economy, is largely decided by the amount of sulphur in it. Moreover, sulphur being the most abundant hetero-element in crude oil, is of more concern than other heteroatoms. Sulphur exists both in aliphatic and aromatic forms in crude oil. All are collectively termed organic sulphur compounds. Crude oil needs to be refined before its use as a source of energy. Therefore, the refining process is of utmost importance for the quality of petroleum products. This process involves quite complex steps. A great deal of attention has been paid to selective solvents for extracting aromatic compounds from hydrocarbon mixtures and petroleum fluids. One of these solvents, which have been used for this purpose, is N-methylpyrrolidone (NMP). The aim of this work was to research the quantum chemical calculations for the possible mechanism of interaction between the solvent (NMP) and thiophene, which is a product of extraction of petroleum products.