Issue 30, 2016

Effect of gas oil composition on performance parameters of the extractive desulfurization process

Abstract

Extractive desulfurization of synthetic and actual gas oil with various solvents was carried out to understand the fruitfulness of studies on solvent screening using synthetic carrier phases. Solvent extraction of various model sulfur compounds from two synthetic carrier phases of different composition was carried out using N,N-dimethylformamide (DMF) solvent to illustrate the effect of the sulfur compound molecular structure on its extractability and interaction with the carrier phase composition. Removal of sulfur compounds from the synthetic carrier phase followed the order: BT ≈ DBT > 4-methyl-DBT > 3-methyl BT ≈ 4,6-dimethyl-DBT > 2-N-octylthiophene ≫ 1-dodecanethiol. Thereafter, extraction of actual straight run gas oil (SRGO), cracked gas oil (CGO), and their mixtures was studied using DMF to understand the effect of their composition on extraction performance. Performance parameters such as yield of raffinate, degree of sulfur removal, distribution coefficient, and performance factor were found to be quite different for different gas oil streams. Thereafter, models were developed for correlating performance of extraction in terms of degree of sulfur removal (Dsr), yield (Y) of extracted gas oil with composition of gas oil and operating conditions. A performance factor (Pf,α) (defined as the summation of Dsr and Y with the weight factor (α) to Dsr) model was used to estimate the optimum operating conditions to maximize the extraction performance. Results indicate that the value of the weight factor (α) affects operating conditions, Dsr and Y, significantly and should be chosen with utmost care in light of downstream process capabilities and overall process economics.

Graphical abstract: Effect of gas oil composition on performance parameters of the extractive desulfurization process

Article information

Article type
Paper
Submitted
26 Dec 2015
Accepted
24 Feb 2016
First published
26 Feb 2016

RSC Adv., 2016,6, 25293-25301

Effect of gas oil composition on performance parameters of the extractive desulfurization process

S. Kumar, V. Chandra Srivastava, A. Kumar and S. M. Nanoti, RSC Adv., 2016, 6, 25293 DOI: 10.1039/C5RA27757D

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