Study On Adaptability Factor Of Residue Hydrogenation Feedstock

At present,the supply of conventional light crude oil is drying up,which leads to an increasing dependence on the unconventional oil sources in the world.In the residue hydrotreating process,hydrogen reacts with heavy oil fractions at medium and high temperature to selectively remove impurities.Compared with other processes,the yield of liquid oil is much higher.In addition,residue hydrotreating technology is green and environmentally friendly,with ideal product performance and flexible operation,so residue hydrotreating is becoming more and more important.In this study,MR2# was used as the raw material for thermal and hydrogenation reaction in the autoclave.The influence of reaction temperature on performance of thermal reaction and the contrast between thermal reaction and hydrogenation reaction were both explored.Consequently,the physical parameters influencing the raw material adaptability factor was obtained,and the fitting and correlation matching was studied.The results showed that: the increase of thermal reaction temperature can promote the removal rate of sulfur,nitrogen,nickel and vanadium,and the increase of temperature is particularly favorable for vanadium removal.The properties of the thermal reaction samples showed that the polarity of the residue and its recombination components decreased after the thermal reaction.The greater the residual sample polarity,the smaller the colloidal stability parameters,and the higher the asphaltene content,the higher the coke generation rate.The coke generation rate increases with the increase of reaction temperature.Compared with the thermal reaction,the content of saturated and aromatic components in the hydrogenation sample increases,while the content of asphaltene and resin decreases.The oil sample after hydrogenation is more stable than that after thermal reaction.The removal rate of sulfur,nitrogen,nickel and vanadium in the hydrogenation reaction is improved greatly,and the hydrogenation reaction is more favorable to the removal of vanadium.After hydrogenation,the polarity of residue and its recombination decreases,and the contents of S and N and the dipole moment show the same trend,indicating that the polarity of residue is mainly affected by sulfur and nitrogen elements.After hydrogenation,the colloidal stability parameters get larger and the coke formation rate decreased significantly.Compared with the thermal reaction,the hydrogenation reaction can inhibit the coking behavior of the residue in the reaction process.After the hydrogenation reaction,the structural parameters of the hydrogenation catalyst decreased with various degrees,and the decreaseing rates of pore volume and specific surface area are the highest.By processing the hydrogenation data of A,B,C,D,E and their mixed preparation of ten kinds of residue,six basic property parameters which are easy to obtain and commonly used to characterize the properties of residue are selected as independent variables,and the amount of carbon deposition which affects the activity of catalyst is selected as dependent variable.Through the analysis,it is indicated that the selected physical parameters can be used to fit the adaptability factor of feedstock.After the fitting of the six selected physical parameters by matlab,the fitting results can generally reflect the adaptability of feedstock for residue hydrogenation reaction.The results show that the higher the adaptability factor K,the less suitable the oil sample is for hydrogenation.