Process and device for preparing oil product by mixing oil slurry, recycle oil and coker gas oil

Abstract

The invention provides a process and a device for preparing an oil product by mixing oil slurry, recycle oil and coker gas oil. The process comprises the following steps: mixing oil slurry generated by a catalytic cracking process, recycle oil and coker gas oil generated by a delayed coking process to obtain mixed oil, and carrying out a two-stage extraction process on the mixed oil, wherein extracting agent dimethyl sulfoxide is adopted in the first-stage extraction, and first-stage extraction liquid and first-stage raffinate are obtained after extraction; performing steam stripping on the first-stage extraction liquid to obtain aromatic hydrocarbon-rich oil, and performing steam stripping on the first-stage raffinate to obtain first-stage raffinate oil, wherein the first-stage raffinate oil is subjected to second-stage extraction, extraction agent N, N-dimethylacetamide is adopted for second-stage extraction, and second-stage extraction liquid and second-stage raffinate are obtained after extraction; and performing steam stripping on the secondary extraction liquid to obtain olefin and aromatic hydrocarbon, and performing steam stripping on the secondary raffinate to obtain oil rich in saturated hydrocarbon. According to the method, three oil products are firstly mixed and extracted, an extraction phase is used for producing carbon materials such as asphalt blend oil and needle coke, and a raffinate phase is used as a catalytic raw material or is used for producing lubricating oil through hydrogenation.

Description

technical field [0001] The invention belongs to the technical field of oil product processing and relates to a process and a device for preparing oil products by mixing oil slurry, re-refined oil and coker wax oil. Background technique [0002] Fluid catalytic cracking (FCC) is an important secondary processing technology for heavy oil in my country. The processing raw materials are atmospheric residue, vacuum gas oil, vacuum residue and coking gas oil, and a certain proportion (generally 0.3 ~0.7) oil slurry and re-refined oil; products are gas, liquefied gas, gasoline and diesel. As the quality of crude oil deteriorates, the properties of catalytic raw materials also become worse and worse, and the amount of slurry thrown out of the FCC unit gradually increases. [0003] Catalytic cracking oil slurry is rich in a large amount of polycyclic aromatic hydrocarbons, and the content of aromatic hydrocarbons is 20% to 50%. Polycyclic aromatic hydrocarbons (three-ring aromatics a...

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Problems solved by technology

[0009] CN133338A discloses a combined process for producing high-quality catalytic cracking raw materials, combining coking and lubricating oil extraction, extracting CGO with lubricating oil extract, and obtaining CGO Nitrogen content and condensed ring aromatics content are significantly reduced, providing high-quality raw materials for FCC units, but the article does not mention FCC oil slurry and back refining oil treatment methods

FCC oil slurry, FCC re-refined oil and coker wax oil produced from naphthenic crude oil contain a large amount of polycyclic naphthenes. There are fewer related reports and a large space for utilization

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