Study On The Compatibility Of Mixed Residual Oils And Their Influences On Hydrogenation Reaction

In recent years,with the rapid growth of global refining demand and the gradual decline of crude oil quality,the situation of mixed transportation and blending has become increasingly common.In this paper,the compatibility of five residues with large stability differences(A,B,C,D and E)with different mixing ratios is discussed,and the dielectric constants of each component of the residues are calculated by using the Hamaker constant of colloidal particles.Five residuum feedstocks and five mixed oil samples b3,d3,e3,A2 and A5 were used for hydrogenation under the same conditions to investigate the influence of residuum types on hydrogenation.In the experiment,the compatibility of mixed samples was determined by the spot test.By comparing the component data of the experimental samples,it was found that the CSP of the oil samples with similar saturated content and aromatic content was still significantly different,it is mainly due to the difference in the content of colloid and asphaltene,that is,the relative content of colloid and asphaltene was the main factor for the stability of residue oil.The colloid stability index(RSI)of the prediction model was constructed by combining the component composition,dielectric constant(?)and stability data of oil samples.Taking RSI=0.5 as the boundary,when RSI>0.5,the residue is more unstable,when RSI<0.5,the residue is more stable.In order to quickly judge the stability of mixed residual oil,?are calculated by using the following conditions:?_asp=18.0??_res=4.5.The content of asphaltene in residue samples decreased after hydrogenation,the stability of different types of residue showed different trends,and the overall H content increased after hydrogenation of residue.The removal effect of the catalyst on V was better than that on Ni,and the removal of S was generally better than that of N.Comprehensive consideration Ni,V,S,N removal effect,C residue integral effect is better,and d3 residue sample treatment effect is poorer.The hydrogenation effect of residue oil samples with less heteroatom content and less asphaltene content than 5.0wt%was better(e.g.B,C,D).The hydrogenation effect is better when the two residues are mixed with good stability(e.g.b3 and e3).High asphaltene content and poor hydrogenation effect(e.g.A,E,d3),excessive residuum mixing of different properties is not conducive to residuum hydrogenation(e.g.A2,A5).By comparing the carbon deposition on the catalyst after the reaction,it can be seen that the content of colloid and asphaltene has a great influence on the carbon deposition.The average pore volume,pore diameter and specific surface area of the catalyst decreased after the reaction,and the average pore volume loss rate was larger.The pore volume loss rate of the catalyst after the reaction of residue A,d3 and A2 was more than 46%,and the pore diameter loss rate was more than 28%.The residual oil with good stability and less metal and heteroatom content had little effect on the catalyst.The loss of structure parameters of catalyst is large after mixed sample reaction.