Inferior diesel oil quality change method

Abstract

The invention provides a method of improving poor diesel. Said method is made up of two technique: quanlity-improving through hydrogenation and solvent extraction. Poor diesel raw material is treated through quality-improving hydrogenation catalysis bed to strip sulfur, nitrogen and aromatic hydrocarbons, then the final liquid product is extracted through solvent oil to make sure that most of the aromatic hydrocarbons are extracted and get clean diesel products which is low in sulfur, nitrogen and aromatic hydrocarbons, but high in cetane ratio, and the extracted aromatic hydrocarbons are circulated to catalysis bed. Group techniques in said invention could deeply decrease the content of sulfur, nitrogen and aromatic hydrogenation in diesel, increase the cetane ratio at the same time through making full use of their own features, therefore, making the quality of the production meet the need of fuel specification and environmental legislation, also maintain a higher diesel rate.

Description

technical field [0001] The invention relates to a method for upgrading low-quality diesel oil, in particular to a method for upgrading low-quality diesel oil with high aromatics content, which can greatly reduce the content of sulfur, nitrogen and aromatics, and increase the cetane number of diesel fractions. Background technique [0002] At present, international and domestic crude oil has shown a trend of heavy and inferior crude oil, and the range of oil fields involved is becoming more and more extensive. In addition, the continuous development of the world economy and the increasingly stringent environmental protection regulations require the production of a large amount of light clean fuels. All of these require the perfection and improvement of the existing oil refining technology to produce products that meet the requirements at the lowest cost. In our country, due to historical reasons, heavy oil lightening devices such as catalytic cracking and coking still widely ...

AI Technical Summary

Problems solved by technology

Hydrogenation and upgrading technology of diesel fractions, such as CN1156752A and CN1289832A, etc., although it can increase the cetane number of diesel oil and reduce the content of impurities such as sulfur and nitrogen, it can only convert a part of aromatics into cycloalkanes and polycyclic aromatics for hydrogenation Saturated, the content of aromatics is not reduced much. For raw materials with high aromatics content in raw oil and difficult processing, they still cannot meet the requirements for aromatics content and cetane number in diesel fraction products, so they cannot meet the new diesel quality standards. Requirements (aromatic content <20wt%, or even lower)

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