Hydrogenation process combination method

Abstract

The invention discloses a hydrogenation process combination method. The method comprises the following steps: 1, mixing a wax oil raw material with hydrogen, allowing them to go through a first hydrogenation reaction zone, and separating the obtained hydrogenation reaction effluent by allowing it to enter a hot high-pressure separator; 2, mixing the gas phase and coked gasoline obtained in step 1, and allowing them to go through a second hydrogenation reaction zone under gasoline hydrofinishing conditions; and 3, directly mixing the reaction effluent obtained in step 2 with a diesel oil raw material, allowing them to go through a third hydrogenation reaction zone under diesel oil hydrofinishing conditions, and separating and fractionating the obtained reaction effluent to obtain lightweight products. According to the invention, the wax oil hydrogenation high-pressure separation gas is directly mixed with the coked gasoline fraction to generate heat, so the temperature of the material entering the coked gasoline hydrogenation reaction zone is elevated, thereby reaction demands are satisfied; and a coked gasoline heating furnace an be canceled, so a work stopping problem caused by furnace tube coking generated during heating the coked gasoline in the heating furnace is avoided.

Description

technical field [0001] The invention relates to a hydrogenation process combination method, in particular to a hydrogenation process combination method of wax oil hydrogenation treatment, gasoline hydrofinishing and diesel oil 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 oi...

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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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