A joint hydrogenation process of animal and vegetable oil and catalytic diesel oil

Abstract

The invention discloses a plant and animal oil and catalytic diesel oil associated hydrogenation process. The method is as follows: plant and animal oil is mixed with hydrogen, and then the mixture enters into a hydrogenation isomerization reactor for hydrogenfinishing and isomerized condensation point reduction reactions; a reaction effluent enters into a hot high-pressure separator for separation, a hot high pressure liquid separation phase is mixed with catalytic cracking diesel oil, then the mixture enters into a hydrogen mixing tank for hydrogen mixing, and then the mixture enters into a liquid phase hydrogenation reactor for the hydrogenfinishing reaction, and part of the hydrogenfinished diesel oil is cycled to a lower catalyst bed layer of the hydrogenation isomerization reactor. After hydrogenation isomerization condensation point reduction of the plant and animal oil, on one hand, the hydrogen dissolving amount of the liquid phase hydrogenation reactor can be improved, the condensation point is reduced, and the plant and animal oil has a high cetane number, and can make up for the shortage of a deficient cetane number of catalytic diesel oil by catalytic associated hydrogenation. The method broadens the sources of raw materials for diesel oil production of a refinery plant, and provides a way out for processing of poor-quality catalytic diesel oil.

Description

Technical field [0001] The invention relates to a combined hydrogenation process for animal and vegetable oils and catalytic diesel, in particular to a hydrogenation process for processing vegetable oil and catalytic diesel by a combined gas phase cycle hydrogenation and liquid phase hydrogenation unit to produce clean diesel with high cetane number process. Background technique [0002] With the gradual depletion of petroleum resources, the proportion of heavy and inferior crude oils processed by refineries has increased year by year. Therefore, the proportion of secondary processed diesel, especially catalytic diesel, has gradually increased in the refinery processing process. Normally, catalytic diesel It contains a lot 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. At the same time, as the world's oil reserves become less and less, the use of renewable resources such as an...

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Problems solved by technology

However, due to the high content of aromatics in catalytic diesel, the hydrogen consumption in the reaction is very high. At the same time, compared with alkanes, the amount of hydrogen dissolved in aromatics is lower. Therefore, in the traditional liquid-phase hydrogenation process, it is difficult to directly For processing catalytic cracking diesel oil

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