Hydrogenation conversion method for poor ignition quality fuel distillate

Abstract

The invention discloses a hydrogenation transformation method of poor quality diesel distillate. The poor quality diesel distillate and hydrogen pass the reaction area which contains hydrorefining catalyst; the obtained material is separated to obtain hydrogen-rich gas and diesel distillate; the hydrogen-rich gas and the diesel distillate is fed into the hydrogenation cracking reaction area; the separated aviation kerosene distillate is fed into the aviation kerosene hydrorefining reaction area; the gas obtained in the hydrogenation cracking area through the separation of the material stream is for recycle use; naphtha and diesel product are obtained; the obtained aviation kerosene distillate is fed into the aviation kerosene hydrorefining reaction area; the gas obtained through the separation of aviation kerosene hydrorefining material steam is for recycle use and the aviation kerosene product is obtained. The hydrogenation transformation method of poor quality diesel distillate adopts the combination process of hydrorefining and hydrogenation cracking to transform the diesel distillate into high quality naphtha, aviation kerosene and diesel products directly.

Description

Technical field [0001] The invention relates to a method for hydroconversion of inferior diesel fractions, in particular to a combined hydroconversion method for directly producing high-quality naphtha, jet fuel and diesel products from inferior diesel fractions. Background technique [0002] The consumption of petroleum products is increasing year by year, and petroleum resources are declining. Therefore, it is required to improve the extraction technology to produce heavier and lower-quality crude oil, which makes it more difficult to refine petroleum. Some important methods commonly used in the lightening of heavy oil, such as coking and catalytic cracking, can produce light motor fuel, but these fractions, especially diesel fractions, are getting worse and worse, mainly due to high sulfur content and aromatic content. High, high density, low cetane number. With the increasingly strict fuel regulations and environmental protection regulations, environmentally friendly petroleu...

AI Technical Summary

Problems solved by technology

There are two main types of hydrofining technologies: one is single-stage hydrofining of secondary processed diesel fractions at medium or low pressure, such as FR2764902, RU2058371, US5068025, US5543036, US5817594, US5035793, etc. Hydrogen refining process, this technology can easily make the sulfur content in the distillate oil reach a very low level, but the increase in cetane number is very small, basically 3 to 6 units, and the saturation degree of aromatic hydrocarbons is poor

The other is a two-stage refining technology using noble metal catalysts, which can ensure that sulfur and nitrogen in diesel oil are completely removed in the first stage and a large amount of aromatics are removed in the second stage, so that the content of sulfur, nitrogen and aromatics in the product Meet the requirements, such as US5556824 and US5651878, etc., but the one-time investment of its catalyst and device is very huge, and it is divided into two stages of operation, the operation is very complicated, and the stability of the catalyst is relatively poor. limited ability

[0004] Distillate fraction hydrogenation upgrading technology, 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 only converts a part of aromatics into the saturation of naphthenes and polycyclic aromatics. The reduction of aromatics content is not 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 requirements of new diesel quality standards. (Aromatics content <20wt%, or even lower)

[0005] Using medium pressure hydrocracking technology, such as US5611912, US4985134, US4971680 and US4483760, etc., although it can greatly increase the cetane number of diesel fraction, it cannot directly produce products that meet higher specifications. In addition, medium pressure hydrocracking technology has obtained The quality of the jet fuel distillate product meets the product requirements of jet fuel

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