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Extractive desulfurization of fluid catalytic cracking (FCC) gasoline with sulfolane was studied in a batch apparatus. The influence of three inlet parameters (temperature, inlet sulfur content, and solvent ratio) on the process response, that is, desulfurization efficiency, was investigated with the use of a Box-Behnken experimental design by response surface methodology. A mathematical model that can be used for predicting sulfur content in raffinate after extractive batch processing with sulfolane was statistically developed and proven with analysis of variance. Statistical analysis showed that the largest influence on desulfurization efficiency was solvent ratio, the second most significant influence was inlet sulfur content, followed by temperature, and last the interaction between solvent ratio and inlet sulfur content. The obtained second-order polynomial model shows that maximum desulfurization efficiency of 65.34% can be achieved at temperature of 50 ı C and higher values of inlet sulfur content and solver ratio in the researched range of inlet parameter values.

The removal of dibenzothiophene from model fuel was carried out by adsorption on commercially available adsorbents including an activated carbon, aluminum oxide, 13X and Y zeolite. Activated carbon was SOLCARB TM C3 which was grinded from its original particle size 1.0-2.0 mm to the 0.40-0.80 mm, while aluminum oxide Selexsorb CDX, 13X zeolite MSE 13X and Y zeolite HSZ-320NAA were used in their as delivered particle size ranges of 2.7-3.0, 1.6, and 300-600 nm, respectively. Adsorption experiments were carried out in batch mode at 24.5 ± 0.7°C using model fuel comprising cyclo-hexane, n-heptane, n-octane and dibenzothiophene in the concentration range of 0.48-42.91 mg/g. The experimental data was used to compare applied adsorbents and to carry out equilibrium characterization and kinetic analysis of the adsorption process. The evaluation of the tested adsorbents showed that the best adsorptive performance was achieved by the Y zeolite. The analysis of the adsorption equilibrium data and the kinetic analysis showed that of the applied models the best fits to the experimental data were achieved by the Sips and Ritchie models, respectively.

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