چكيده به لاتين
Todays, oxidative desulfurization (ODS) is one of the methods which has been widely considered for deep desulfurization of fuel. Several parameters can affect the efficiency of the ODS process. Deep eutectic solvents (DES) have been used in the desulfurization process due to their very good physical and chemical properties. In this thesis, a deep eutectic solvent made from a mixture of para-toluenesulfonic acid and choline chloride at 85 ° C, was used as both catalyst and extractant in the oxidative desulfurization process. Along with this solvent, H2O2 was utilized as the oxidant to remove dibenzothiophene (DBT) from model fuel containing 500 ppm of sulfur compounds. In order to accelerate the rate of the oxidation reaction, ultrasound (US) was used. Due to high mixing of ultrasound waves, the reaction time was reduced from 60 minutes for ODS to 2 minutes for ultrasound assisted oxidative desulfurization (UAOD). Time, DES and H2O2 volumes of were considered as three important parameters in the UAOD process and optimized by the surface response methodology (RSM) based on the Box-Behnken design (BBD). The maximum desulfurization of 97.53% was achieved at optimal condition of 121.168 s of time, 5.083 ml of DES and 0.289 ml of H2O2. The effect of each parameter on the rate of desulfurization was also investigated. The results showed that the variation of oxidant volume was more important than two other variables. In an economical point of view, the regeneration of solvent is of great importance. Therefore, the solvent was recycled and reused for desulfurization. The results showed that DES has a good recycling performance in the UAOD process.
Keywords: Disel fuel, Oxidative Desulfurization, Deep Eutectic Solvent, Ultrasound, Box-Behnken Design
