Method for lightening residual oil

Abstract

The invention discloses a method for lightening residual oil. According to the method, residual oil raw materials goes through a hydrotreatment device, and the obtained hydrogenated oil undergoes flash evaporation to obtain light components and heavy components; the heavy components enters a reduced pressure distillation device to separate out reduced pressure wax oil, and the reduced pressure wax oil which is mixed with the hydrogenated light components enters a catalytic cracking device and undergoes fractionation to obtain a gas, gasoline and diesel oil which are discharged form the catalytic cracking device and recycle oil and oil slurry which are returned to the hydrotreatment device; and reduced pressure residual oil obtained by the reduced pressure distillation device enters a delayed coking device and undergoes the fractionation to obtain a gas, gasoline and a diesel oil fraction which are discharged from the delayed coking device and coked wax oil and tail oil which are returned to the hydrotreatment device. The method which combines the residual oil hydrotreatment, the catalytic cracking, the reduced pressure distillation and above delayed coking technology allows charged material compositions of the residual hydrogenation, the catalytic cracking and the delayed coking to be optimized, and target product yields of the catalytic cracking and the delayed coking to be improved.

Description

technical field [0001] The invention relates to a method for lightening residual oil, specifically combining residual oil hydrotreating with catalytic cracking, delayed coking and vacuum distillation devices, and mainly producing high-octane gasoline products with residual oil as raw material and diesel fraction process. Background technique [0002] As crude oil becomes heavier and worse, more and more residues need to be processed. The processing of heavy and residual oil not only needs to crack it into products with low boiling point, such as naphtha, middle distillate oil and vacuum gas oil, etc., but also to increase their hydrogen-carbon ratio, which requires decarbonization or Hydrogenation method to achieve. The decarbonization process includes coking, solvent deasphalting, heavy oil catalytic cracking, etc.; hydrogenation includes hydrocracking, hydrofining, etc. The hydrogenation method can not only hydrogenate and convert residual oil, improve the yield of liqu...

AI Technical Summary

Problems solved by technology

In this method, all the residual oil hydrogenated to produce oil enters the atmospheric distillation unit, resulting in an increase in the load of the atmospheric distillation unit and an increase in operating costs; in addition, a part of the atmospheric residual oil is used as a catalytic cracking feed component, which increases the catalytic cracking raw material. The impurity content of the catalyst will reduce the quality of the catalytic product and affect the yield of light oil at the same time

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