Studies On The Hydroprocessing Of Residue

In recent years, the crude oil resources are becoming inadequate and heavier. The demand for high value petroleum products such as middle distillate, gasoline and lube oil is increasing. The petrochemical products are upgrading and the environmental concerns have increased, resulting in more rigorous specifications for petroleum products. These trends put great challenges to refining industry to process heavier crude oil. Residue hydroconversion process is an effective method to solve the problem.In this paper, FZC-41A catalyst studied by FRIPP was used and the hydrogenation performance of Suizhong36-1 AR was studied. It was showed that increasing process temperature, longer reaction time and increasing cat./oil improved the conversion of AR, resulted in the increasing yield of coke, gasoline and diesel. With the increase of hydrogen pressure, the conversion of AR and the yield of gasoline and diesel first decreased then increased, the yield of coke decreased. Under different reaction conditions and different cat./oil, the desulfurization rate was higher than the rate of nitrogen removal, the properties of >350℃residue were different from raw material. Considering the residue cracking conversion, the amount of coke and the removal of the S,N-heteroatom, it was decided that the optimal process parameters for Suizhong36-1 AR in an autoclave was as follows: the reaction temperature was 400℃, the initial hydrogen pressure was 8.0MPa, the reaction time was 3hr and the cat./oil was 1:10.Suizhong36-1 AR, Tahe AR, Fushun VR and Shengli VR were used as the materials for hydrogenation experiments under the following conditions: reaction temperature 400℃, H2 initial pressure 8.0MPa, the reaction time 2hr, cat./oil 1:10. The result showed that the coke yield was higher when the material contained more resin and asphaltene. Coke was mainly derived from asphaltene. Under certain reaction condition, the residue with more resin and asphaltene got higher conversion and higher yield of gasoline and diesel.The effect of asphaltene content on the hydroprocessing of residue was studied under the same condition. It was observed that the conversion of residue rised by 11.41% when the asphaltene content increased from 2% to 12%. The yield of gas, coke, gasoline and diesel also rised. The removal rate of sulfur and nitrogen first increased then decreased with the increase of asphaltene content. CoMParing the asphaltene after hydrogenation with raw asphaltene and it was found that its molecular weight, hydrogen-carbon ratio and the sulfur content decreased but the nitrogen content increased, the aromaticity and the condensation degree increased. The content of sulfur and nitrogen increased with the increase of asphaltene content.