Animal and vegetable oil-catalytic diesel oil combined hydrogenation method

Abstract

The invention discloses an animal and vegetable oil-catalytic diesel oil combined hydrogenation method. The animal and vegetable oil-catalytic diesel oil combined hydrogenation method comprises following steps: countercurrent contact of animal and vegetable oil with hydrogen is carried out in a hydrogenation heterogeneous reactor, and hydrofinishing and condensation point reduction reaction are carried out; an obtained liquid effluent is mixed with catalytically cracked diesel oil, an obtained mixture is delivered into a hydrogen mixing tank for hydrogen mixing, and then is delivered into a liquid phase hydrogenation reactor for hydrofinishing; a part of obtained hydrofined diesel oil is cycled to a lower catalyst bed layer of the hydrogenation heterogeneous reactor. On the one hand, hydrogenation heterogeneous condensation point reduction of the animal and vegetable oil is capable of increasing hydrogen dissolving amount of the liquid phase hydrogenation reactor, and on the other hand condensation point of the animal and vegetable oil is reduced, the animal and vegetable oil is high in cetane value, and combined hydrogenation of the animal and vegetable oil with catalytic diesel oil is capable of solving a problem that the cetane value is too low. The animal and vegetable oil-catalytic diesel oil combined hydrogenation method is capable of widening raw material sources for refinery diesel oil production, and also providing a method for processing of low-quality catalytic diesel oil.

Description

technical field [0001] The invention relates to a combined hydrogenation process of animal and vegetable oils and catalytic diesel oil, in particular to a gas-phase cycle hydrogenation and liquid-phase cycle hydrogenation combined device for processing animal and vegetable oils and catalytic diesel oil to produce clean diesel oil with high cetane number Hydrogenation process method. Background technique [0002] With the gradual depletion of oil resources, the proportion of heavy and low-quality crude oil processed by refineries is increasing year by year. Therefore, the proportion of secondary processed diesel oil, especially catalytic diesel oil, is gradually increasing in the refinery processing process. It contains a large amount of aromatic hydrocarbons, and the cetane number is very low. Even after hydrofining, it is very slow to meet the cetane number requirements of diesel oil. At the same time, as the world's oil reserves are getting less and less, the utilization ...

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Problems solved by technology

However, due to the high content of aromatics in catalytic diesel oil, the hydrogen consumption in the reaction is very high. At the same time, compared with alkanes, the amount of hydro

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