Study On Slurry Bed Hydrocracking Technology For Lungu Heavy Crude Oil Of Tarim With Pilot Plant

In this study, the properties of Lungu heavy oil and its residue in Tarim were investigated. The results showed that Lungu heavy oil was high sulphur and intermediate-base crude oil, of which the density, viscosity, carbon residue (CR), contents of asphaltene, vanadium, sulphur and salt were high, while the condensation point, contents of wax and nitrogen were low. The light fractions of Lungu heavy oil were less compared with the heavy fractions, and the vacuum fraction of Lungu heavy oil had low yield and high content of sulphur, so the products from the vacuum fraction must be treated by hydrodesulfurization before using. Besides, the atmospheric and vacuum residue of Lungu heavy oil were difficult to produce qualified bitumen because of the low ductility.The study investigated the distribution of products and coke formation of slurry bed hydrocracking of Lungu atmospheric residue(LGAR) with water-soluble catalyst on the pilot-plant-scale equipments, in order to find the optimal reaction conditions during two kinds of projects. The results showed that when using 800～1000μg/g UPC-22 catalyst, choosing the project of fresh feedstock passing equipment at one time, the optimal reaction conditions were that the reaction temperature was 440℃, the space velocity was 1.0h-1, hydrogen partial pressure was 10.0MPa and H2/Oil was 800～1000:1, under which the fractions (< 500℃) could reach 61%～71%, the yield of gas was 2.5～3.7%, the yield of naphtha and diesel oil fractions was 24～34%, and the yield of bottom oil (>500℃) was 30～40%, while choosing the project of vacuum gas oil circulation, the optimal reaction conditions were that the reaction temperature was 435～440℃, the total space velocity was 1.0h-1, the fresh feedstock space velocity was 0.6h-1, circular ratio was 4:6, hydrogen partial pressure was 10.0MPa and H2/Oil was 800～1000:1, under which the fraction (< 500℃) could reach 60%, the yield of gas was 5.5%, the yield of naphtha and diesel oil fractions was 51.4%, and the yield of bottom oil (>500℃) was 40.3%.The study made further study on the feasibility of slurry bed hydrocracking technology and the effects of operation conditions to the technology, used the solvent suspension separation technology to separate the bottom oil fraction of LGAR slurry bed hydrocracking products in order to obtain better components of synthetic crude oil, and analyzed the properties of synthetic crude oil. The results showed that when using the secondary suspension separator on the vacuum column, the quantity of bottom oil separation decreased, and the economic benefits of this technics improved. The feasible technics should include atmospheric and vacuum distillation of Lungu heavy oil, slurry bed hydrocracking of LGAR, and the solvent suspension separation of the bottom oil. The properties of five kinds of synthetic crude oil were all right except the high sulphur, and these synthetic crude oil had many characteristics, such as the yield of light oil was high (the fractions <500℃was more than 80%), the viscidity, condensation point, CR, and metal content were all low. These synthetic crude oil will bring immeasurable economic benefits to the downstream processing.