Research On The Hydrogen And Related Gas Solubility Of Diesel Liquid Circulation Of Hydrogenation Process

In order to reduce harmful emissions and improve air quality, our country to accelerate oil quality upgrade process,requiring sulfur content of diesel cut down to ultra low levels. Ultra-low sulfur limitation of diesel inducing economic and technical challenges to the existing petrochemical refining industry.Liquid phase circulation hydrogenation process is a new process for compliance with the new standard diesel production. The characteristics of this process is the oil presaturated by hydrogen,then fed into the reactor, where hydrogen have been saturated in oil can participate in hydrogenation reactions. Hydrogen solubility in diesels is one of the key facts in liquid phase circulation hydrogenation process technology. However, the solubility data in our petroleum fractions under high temperature and high pressure is lack. Therefore, study on the solubility of hydrogen in diesels is very meaningful.As byproducts of hydrodesulfurization process, H2S, NH3and CH4will have inhibitory effect on the diesel hydrogenation process. At the same time, existence of sulfur and nitrogen in the process also influence the product quality of oil. Research of the solubility of H2S, NH3, CH4in diesel and the influence on hydrogen solubility in diesel, can provide parameters for liquid phase circulation hydrogenation process of diesel and optimize experimental conditions.In this paper, the gas solubility measurement was designed by our group to measure gas solubility in different types of diesel. The experimental temperature was in323-623K range, and the pressure range from2to10MPa. The hydrogen solubility increases linearly with the pressure and temperature. The hydrogen solubility in0#diesel was largest than that in other oils.A simulation model was developed using Aspen Plus to mimic calculating the solubility of gas (H2, H2S, NH3, CH4)in diesel and to predict the influence of H2S, NH3, CH4on hydrogen solubility in, diesel. Hydrogen and methane solubility increased linearly with the pressure and temperature. Ammonia and hydrogen sulfide solubility increased linearly with the pressure following the Henry’s law. Simultaneously, ammonia and hydrogen sulfide solubility in diesel was larger than hydrogen and methane solubility in diesel.By comparing the results of the influence of H2S, NH3, CH4on hydrogen solubility in diesel data acquired from mimic calculation, it was demonstrated that the existence of these three kinds of gas, has a certain inhibition effect on solubility of hydrogen in diesel.