A kind of combined hydrotreating method

Abstract

The invention discloses a combined hydrotreatment method, comprising the following steps of: allowing a wax oil raw material and hydrogen to pass through a first hydrogenation reaction zone and separating a reaction effluent; mixing an obtained gas phase and coker gasoline and allowing the mixture to pass through a second hydrogenation reaction zone; directly mixing the reaction effluent and a diesel oil raw material and letting them pass through a third hydrogenation reaction zone, and carrying out separation and fractionation on the obtained reaction effluent so as to obtain refined gasoline and diesel oil; mixing the diesel oil and supplemented hydrogen and letting them pass through a fourth hydrogenation reaction zone, and dropping pour point. By the adoption of the method, heat brought from a gas generated from wax oil hydrotreatment at a higher temperature and reaction heat of coker gasoline can be reasonably utilized; and on the basis of minimizing construction investment to the maximum, refined gasoline, diesel oil with low condensation point and high-quality catalytic cracking raw oil can be produced, thus reaching an ideal comprehensive processing effect.

Description

technical field [0001] The invention relates to a combined hydrotreating method, in particular to a combined hydrotreating method of wax oil hydrotreating, gasoline hydrofinishing and diesel hydrofinishing. Background technique [0002] With the continuous development of the world economy and increasingly stringent environmental protection regulations, it is necessary to produce a large amount of light and clean fuels. However, the properties of crude oil in the world are gradually becoming heavier and worse. Petrochemical crude oil needs secondary processing methods such as delayed coking and catalytic cracking. Secondary processed gasoline and diesel contain a large amount of impurities such as sulfur, nitrogen, olefins, aromatics, etc., which cannot be directly used as blending components, and can only be used after general hydrofining. Used as a blending component. All of these require the perfection and improvement of the existing oil refining technology to produce p...

AI Technical Summary

Problems solved by technology

This method can obtain the most high-quality clean diesel oil and high-quality naphtha at the same time, but this method does not make full use of the characteristics of low initial temperature and high temperature when coking light distillate oil is hydrogenated, and coking heavy distillate The necessity of hydrorefining after hydro-upgrading of oil is not obvious

[0007] In the prior art, the hydroprocessing of wax oil and the hydrofining of gasoline and diesel oil are all operated separately. Although they can meet the purpose requirements, since several sets of processing devices are completely independent, each has independent equipment and pipelines, it will inevitably lead to a total investment High cost, high operating cost, etc.

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