Study On Hydrogen Equilibrium Solubility In Diesel Oil

As the step of upgrading diesel oil quality process much more fast in our country, producing the clean diesel oil becomes more and more urgent, the novel technology of low sulfur hydrogenation process become a hot spot. Hydrogen, as the raw material gas in the hydrogenation process, the equilibrium solubility diesel is an essential data to the hydrogen cost calculation in gas phase hydrogenation and pre-saturaion in liquid phase hydrogenation and the react kinetic study. So it is particularly important to study the quilibrium solubility of hydrogen in diesel oil.Basing on the analysis of solubility measuring method, the saturated method was adopted, the equilibrium solubility (C*) of diesel oil was measured in a high pressure stirred autoclave at temperature from 323.15K to 573.15K and pressure from 0 to 8 MPa. According to the characteristic of the experiment apparatus, the volumetric mass transfer coefficient(kLa) was obtained basing on the pressure change during the solute process. The relationship between C* and temperature (T), pressure (p) was that, C* was increased with the increase of T and p and the solute process was obeyed the Henry’s law.According to the research of the preexponential factor and solute heat in the solute process, a correlation of hydrogen equilibrium solubility with paraffin, monocyclic paraffin, dicyclic paraffin, monocyclic aromatics and dicyclic aromatics was proposed and established. The verification results of the correlation shows that, the absolute relative deviation (ARD) between calculated and experimental value of preexponential factor and solute heat was within 3.0%, the C* of another two diesel oil was within 5.0%, and the C* under even higher temperature was within 4.0%. The correlation can be used in a wide range of T and p for the C* calculation of different kind diesel oils in the liquid phase hydrogenation technology.