Solvent evaluation for desulfurization and denitrification of gas oil using performance and industrial usability indices

Abstract

A new strategy for screening of solvents for sulfur, nitrogen, and aromatic compounds removal from gas oil is presented. This ranking is based on comparative assessment of solvents' capacity, selectivity, performance, and newly defined industrial usability indices. Twenty eight solvents comprising of six most widely used industrially proven conventional solvents and 22 imidazolium-based ionic liquids solvents were selected to illustrate the strategy. The solvents were ranked for removal of sulfur compounds namely benzothiophene, dibenzothiophene and their alkylated derivatives, and nitrogenous compounds namely quinoline, indole and carbazole from gas oil. Performance index (P I ) which combines the effect of both capacity and selectivity seems to be better index than individual capacity and selectivity indices to rank the solvents. Industrial usability index (S IUI ) of solvents which includes P I and process complexity factor for solvent recovery section seems more practical and realistic criteria for solvent assessment.

Ultra‐deep catalytic adsorptive desulfurization of diesel fuel using Ti‐silica gel adsorbent at low Ti‐loading

“…The reusability of adsorbents is another indispensable component for the low‐cost CADS process 58,59 . As shown in Figure 8A, there was almost no loss of desulfurization capacity after five consecutive desulfurization‐regeneration cycles.…”

Desulphurization of gas oil in a packed bed extractor: Optimization of operating parameters for simultaneous maximization of efficiency and yield by desirability approach

“…It is known that solubility of aromatics in a polar solvent is much higher than paraffins. Selectivity of solvent for sulphur removal with respect to aromatics is drastically lower as compared to paraffin . Thus, yield and desulphurization efficiency of actual gas oil are much lower than model gas oil due to the absence of aromatics in model gas oil.…”

Removal of Refractive Sulfur and Aromatic Compounds from Straight-Run, Fluidized Catalytic Cracking, and Coker Gas Oil Using N-Methyl-2-pyrrolidone in Batch and Packed-Bed Extractors

“…The selective solvent extraction process can remove the refractive sulfur compounds, polyaromatics, and nitrogen compounds to a very large extent. 13,14 Its use prior to the conventional hydrotreatment process can help in attaining the goal of deep desulfurization at lower capital and operating costs than required in a highseverity standalone hydrotreatment method. 8,15 Solvent extractive removal of sulfur from synthetic diesel (using bezothiophene, dibezothiophene, and their alkylated derivates) has been well-reported in the literature.…”

“…13,15,19−29 In one of our previous studies, 13 extraction of sulfur and polyaromatic impurities from actual straight-run gas oil (SRGO) was studied using various solvents, such as acetonitrile, N,N-dimethylformamide, furfural, N,N-dimethylacetamide, and dimethyl sulfoxide. In the other study, 14 a strategy for screening of solvents for sulfur, nitrogen, and aromatic compound removal from gas oil was developed.…”

“…The desulfurization process can be made more economical using a combination of processes. The selective solvent extraction process can remove the refractive sulfur compounds, polyaromatics, and nitrogen compounds to a very large extent. , Its use prior to the conventional hydrotreatment process can help in attaining the goal of deep desulfurization at lower capital and operating costs than required in a high-severity standalone hydrotreatment method. , …”