Combined process of hydrotreatment and light fraction-conversion for residual oil

Abstract

The invention discloses a combined process of hydrotreatment and light fraction-conversion for residual oil. The combined process comprises the following steps: (1) allowing an inferior heavy oil feedstock to enter into a solvent deasphalting device so as to obtain deasphalted oil and de-oiled asphalt; (2) mixing the de-oiled asphalt obtained in step (1) with at least a part of oil slurry and allowing an obtained mixture to enter into a fluidized bed hydrotreatment unit for fluidized bed hydrotreatment; (3) mixing an effluent of fluidized bed hydrotreatment obtained in the step (2) with the deasphalted oil, adding at least a part of recycle oil of a catalytic cracking unit at the same time and allowing an obtained mixture to enter into a fixed bed hydrotreatment unit, wherein generated oil of an effluent of fixed bed hydrotreatment is used as a feedstock for the catalytic cracking unit; and (4) carrying out treatment in a fractionating tower of the catalytic cracking unit so as to obtain catalytic cracking reaction products including a gasoline fraction, a diesel oil fraction, recycle oil and oil slurry. Compared with the prior art, the combined process provided by the invention has the advantages of wide sources of the feedstocks, low equipment investment, stable operation, a long operation period and a good synergistic and coordination effect.

Description

technical field

[0001] The invention relates to a combined process method of hydrogenation treatment and lightening of residue oil, which is especially suitable for effective processing of low-quality residue oil with high heavy metal content. Background technique

[0002] With the increase of heavy and inferior crude oil and the change of market demand structure for light oil, the processing technology of inferior heavy oil (including various heavy oil and residual oil, etc.) has become the research focus of major oil companies and petroleum scientific research institutions direction. The processing of inferior heavy oil is not only to crack it into products with low boiling point, such as naphtha, middle distillate oil and vacuum gas oil, but also to increase their hydrogen-carbon ratio, so the basic way of its processing is basically There are two methods of hydrogenation or decarburization. Decarbonization processes include coking, solvent deasphalting, heavy oil catal...

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