A Combinatorial Approach to Producing High-Value Products

Abstract

Provided is a combination method for raising yields of high-value products. A wax oil raw material goes to a hydrotreatment reaction zone, and is subjected to reactions of hydrodesulfurization, hydrodenitrification, aromatic hydrogenation saturation, hydrodemetallization and the like under action of hydrogenation catalysts. The obtained hydrogenated oil is subjected to separation and gas stripping. Both the obtained hydrogenated diesel oil fraction and hydrogenated wax oil fraction go to a catalytic cracking unit, a cracking reaction is carried out in the presence of catalytic cracking catalysts, gases, catalytic gasoline, light catalytic diesel oil, heavy catalytic diesel oil and catalytic circulation oil are obtained after fractionation, and the heavy catalytic diesel oil and the catalytic circulation oil are mixed and recycled back to the hydrotreatment reaction zone. Through the method, yields of high-value products of catalytic gasoline and the like can be raised, and yields of low-value products of coke, gases and the like can be lowered.

Description

Technical field [0001] The invention relates to a hydrocarbon oil cracking method for obtaining low boiling point fractions in the presence of hydrogen, and more specifically, to a method for producing high-octane gasoline components and low-sulfur diesel blending components from diesel raw materials. Hydrogen method. Background technique [0002] In the processing flow of the refinery, the wax oil fraction (generally its distillation range is around 350-570°C) cannot be directly used as vehicle fuel. It is necessary to adopt light processing techniques such as catalytic cracking and hydrocracking to make wax Only by splitting oil distillation into components with lower molecular weight and lighter distillation range can qualified gasoline and diesel components for vehicles be obtained. The catalytic cracking process has the advantages of good operational flexibility, high gasoline yield, and low one-time investment. However, the wax oil raw materials with high sulfur content, ...

AI Technical Summary

Problems solved by technology

However, this method requires separate hydrotreating of heavy cycle oil, which increases equipment investment a lot, and only solves the problem of high coke yield in catalytic cracking units, and does not greatly improve product quality.

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