Research On Deep Desulfurization Technology Of Oil By Composite Metal Based Ionic Liquids

With the rapid development of the economics and urbanization, the quantity of motor vehicles increases significantly, causing the boom usage of oil. The high proportion of sulfur element in oil will lead to sulfur dioxide contamination, and large amount of suspended solid particles in burning, the main reasons of acid rain and the formation of haze weather respectively. With the improvement of the standard of sulfur content in oil, because of the steric effects, the recent hydrodesulfurization techniques cannot remove thiophene substance deeply. The new technique of deep desulfurization is needed urgently.Ionic Liquid, IL, is a novel popular solvent in the desulfurization field of light oil, due to its selectivity and poor solubility in other oil. The catalysis of bimetallic system is noticed in the desulfurization and flue gas desulfurization fields, but the external oxidizing agent, hydrogen peroxide, will reduce the efficiency of mass transfer and improve the cost. Ultrasonic cavitation as a common technique in the field of water pollution, is a suitable way to offer oxidant.This paper is based on the Cu-Fe binary composited ionic liquid (Cu-Fe-IL), synthesized by Cu+ based ionic liquid and Fe3+ based ionic liquid. FTIR, TGA、Raman spectrum are included. The microscope is used to observe the microscopic images. The metal content and viscosity of ionic liquid are also measured in this work. The result shows that Cu-Fe-IL is not an simple formation rather than a liquid mixing Cu+ and Fe3+The Cu-Fe-IL extraction desulfurization experiments are conducted for removing dibenzothiophene(DBT) as target pollutant. The effects of extraction duration, temperature and the volume ratio of ionic liquid to model oil on the efficiency of extraction desulfurization are determined. The results show that the extraction desulfurization efficiency is proportional to the extraction time, temperature and volume radio, the optimal efficiency achieves at 95%, which is better than that of single-component ionic liquid. The dynamic research is conducted. The results show that the reaction order of extracting DBT from ionic liquid is one and reaction rate constant, k=0.0096mol·L-1·s-1 at 20℃, is reduced as temperature increases.Ultrasonic cell crusher is employed for ultrasonic cavitation experiments, based on the homogeneous system of acetonitrile, water and ionic liquid. After drying out acetonitrile and water, the mass of DBT in ionic liquid can be measured by the back extracting CCl4. Consequently, the concentration of DBT reduced by 35ppm roughly after 30mins ultrasonic cavitation. The product of oxidation is dibenzothiophene sulfone, with the comparison of standard substance.