چكيده به لاتين
In the present study, extractive desulfurization of gas condensates with initial sulfur content of 1940 ppmw was studied using a microchannel made of glass with different inner diameters. In this study Dimethylformamide (DMF), acetonitrile (ACN) and their combination were used as solvents. The influence of some operating and microchannel geometrical parameters, including the diameter of the microchannel, the solvent flow rate, the fuel flow rate, and the type of solvent on sulfur removal was investigated. It was found that desulfurization by dimethylformamide is higher than that of acetonitrile, and also with the increase of fuel and solvent flow rate, the amount of desulfurization increases, which is due to the increase of the specific surface area. The highest desulfurization was achieved by dimethylformamide solvent at a flow rate of 0.45 ml/min and a ratio of solvent to fuel flow rate of 1:1 in a microchannel with a diameter of 600 microns and a length of 20 cm. In this study, it was observed that with the increase in the diameter of the channel, the amount of desulfurization decreases due to the decrease the surface to volume ratio. For example, by increasing the channel diameter from 600 microns to 1200 microns, the desulfurization decreased from 52% to 46%. Also, in this study, the annual cost of the recovery process of used solvents was estimated and it was observed that the cost of recovery of mixed solvents (combination of dimethylformamide and acetonitrile) is higher compared to pure solvents. Because in order to achieve the desired purity in the recovery process of mixed solvents, 3 distillation towers are needed, which has led to an increase in fixed and operating costs compared to the recovery process of pure solvents. For example, the annual cost of the solvent recovery process including 50% by volume of acetonitrile and dimethylformamide is 3.41 million dollars more than the dimethylformamide solvent, and of course its desulfurization rate is 5% less.
