Method for preparing jet fuel through hydrogenation of hydrogen counter flow grease

Abstract

The invention relates to the field of renewable energy sources and particularly discloses a method for preparing a jet fuel through hydrogenation of hydrogen counter flow grease. The method comprisesthe following steps: (1) enabling the biological renewable grease to be in contact with a hydrotreatment catalyst to implement primary hydrotreatment under the existence of hydrogen, so as to obtain refined oil; (2) enabling the refined oil to be in contact with a heterogeneous catalyst under the existence of hydrogen to implement secondary hydroisomerization visbreaking treatment, distilling andseparating, so as to obtain the jet fuel, wherein the hydrotreatment conditions in the step (1) are as follows: the partial pressure of hydrogen is 6.0-8.0 MPa, the volume ratio of hydrogen to oil ranges from 1200:1 to 1800:1, the liquid hourly mass space velocity is 1h<-1> to 2h<-1>, and the reaction temperature is 380-450 DEG C, and the secondary hydroisomerization visbreaking treatment in the step (2) are as follows: the partial pressure of hydrogen is 6.0-8.0 MPa, the volume ratio of hydrogen to oil ranges from 1200:1 to 1500:1, the liquid hourly mass space velocity is 1h<-1> to 2h<-1>, and the reaction temperature is 280-320 DEG C. The performances (mainly flashing point, freezing point and combustion heat) of the jet fuel prepared through the method are close to that of the petroleumfuel, and meet ore even exceed the key specification of the aviation fuel, and the yield is also up to about 25%.

Description

technical field [0001] The invention relates to the field of renewable energy, in particular to a method for producing jet fuel by hydrogenating fat in countercurrent flow with hydrogen. Background technique [0002] With the rapid development of my country's aviation industry and the acceleration of national defense construction, the demand for jet fuel is increasing. At the same time, my country's dependence on oil imports is increasing year by year, which poses a potential threat to national defense security. From the perspective of meeting the needs of my country's aviation industry and national defense, the development of alternative jet fuels has important strategic significance. [0003] Conventional jet fuel, on the other hand, contains sulfur. Nitrogen, aromatic hydrocarbons, etc., whose large consumption will inevitably pollute the atmospheric environment. In addition, greenhouse gases such as CO2 released during the production and combustion of traditional jet ...

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Problems solved by technology

[0006] In addition, in the process of using oil hydrogenation reaction to prepare jet fuel in the prior art, on the one hand, the hydrogen-rich gas after a stage of hydrogenation contains a large amount of sulfur, COx, water, low-carbon hydrocarbons, etc., which can lead to bed accumulation The deactivation of the isomerization catalyst in the process of carbon and second-stage hydroisomerization depreciation treatment causes the shortening of the operation cycle, which requires frequent shutdowns to replace the catalyst and cannot be recycled directly. Even if the hydrogen can be recovered, the energy consumption of recovery and reuse is high; on the other hand, The first stage of hydrotreatment and the second stage of hydroisomerization and point depressing treatment all need to add hydrogen, and hydrogen is an expensive component of raw materials, so the production cost cannot be reduced

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