A kind of combined hydrogenation method of animal and vegetable oil and catalytic diesel oil

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: animal and vegetable oil is mixed with hydrogen, and an obtained mixture is delivered into a hydrogenation heterogeneous reactor for hydrofinishing and heterogeneous condensation point reducing reaction; an obtained reaction effluent is subjected to hot high pressure separating so as to obtain a gas phase material and a liquid phase material via separation; the liquid phase material is mixed with catalytically cracked diesel oil and recycled hydrofined diesel oil, and an obtained mixed material is delivered into a hydrogen mixing tank for hydrogen mixing, and then is delivered into a liquid hydrogenation reactor for hydrofinishing. After heterogeneous condensation point reducing reaction of the animal and vegetable oil, on the one hand, hydrogen dissolving amount of the liquid phase hydrogenation reactor is increased, 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 a problem that catalytic diesel oil cetane value is too low can be solved via combined hydrogenation with catalytic diesel oil. 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 method for combined hydrogenation of animal and vegetable oils and catalytic diesel oil, in particular to a method for processing animal and vegetable oils and catalytic diesel oil with a gas-phase cycle hydrogenation and liquid-phase cycle hydrogenation combined device to produce clean diesel oil with high cetane number hydrogen process. 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 utiliza...

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Problems solved by technology

Therefore, in the traditional liquid phase circulation hydrogenation process, it is difficult to be directly used to treat catalytic cracking diesel oil

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