Hydrogenation method for producing aviation biofuel

Abstract

The invention belongs to the field of renewable energy processing, and relates to a hydrogenation method for producing an aviation biofuel. The hydrogenation method comprises that (1) raw material oil, first circulating hydrogen and a first hydrogen-rich gas phase are mixed, and impurities are removed in a hydrotreating unit; (2) the hydrotreated product enters a high pressure steam stripping tower, a second hydrogen-rich gas phase is injected from the tower bottom, steam stripping separation of light components is performed, and the gas phase from the top of the steam stripping tower is purified by a gas purifying unit so as to be recycled; (3) the refined oil from the bottom of the high pressure steam stripping tower, new hydrogen and second circulating hydrogen are mixed, the obtained mixture enters a hydroconversion unit, and a selective cracking and isomerization reaction is performed; and (4) the hydroconverted product is subjected to gas-liquid separation, the obtained hydrogen-rich gas phase is respectively fed to the hydrotreating unit and the high pressure steam stripping tower, and the liquid phase is separated by a fractionation unit to obtain the aviation biofuel product and the by-product. According to the present invention, the hydrogenation method has advantages of compact process, low energy consumption, small occupation area, low equipment investment and the like.

Description

technical field [0001] The invention belongs to the field of renewable energy processing, and more specifically relates to a hydrogenation method for producing aviation biofuel. Background technique [0002] With the rapid development of the world's aviation industry, traditional fossil aviation fuel (aviation kerosene) has become the largest emission source of the aviation industry, and its CO 2 Emissions account for 90% of the total emissions of the aviation industry. Although the greenhouse gas emissions of the aviation industry only account for 2% to 3% of all human greenhouse gas emissions, the ability and harm of the greenhouse effect caused by aviation kerosene combustion is far greater than other industries. , the aviation industry is facing severe CO 2 Emissions reduction challenge. [0003] Aviation biofuels prepared from renewable biomass such as animal and vegetable oils or agricultural and forestry wastes have significantly lower greenhouse gas emissions than ...

AI Technical Summary

Problems solved by technology

[0009] 1) Large consumption of new hydrogen

In the process flow, there is no circulating hydrogen system in the isomerization and selective hydrogenation reaction, and only new hydrogen is injected to maintain the hydrogen-oil volume ratio (generally hundreds or thousands) required for the reaction, so a large amount of hydrogen is required ; In addition, this process injects new hydrogen into the high-pressure stripper, in order to meet the stripping effect, the consumption of hydrogen for stripping is also relatively large

[0010] 2) The utilization rate of circulating hydrogen is low, and the amount of hydrogen discharged is large

Compared with the large amount of new hydrogen in this process, the proportion of total hydrogen consumption is relatively low. Therefore, this process will cause a large amount of hydrogen-rich gas phase to be exhausted, and the operating cost is uneconomical.

[0011] 3) The final product is more likely to be contaminated

In this process, the liquid phase of the hydrogen separator and the hydrogen-rich gas phase at the top of the high-pressure stripping tower are mixed into high-pressure air cooling. It often contains impurities such as sulfur and nitrogen, which will pollute the reaction products and final products.

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