Method and system for preparing gasoline and diesel by mixing and hydrogenating coal tar and biomass oil

Abstract

The invention discloses a method and a system for preparing gasoline and diesel oil by mixing and hydrogenating coal tar and biomass oil, and belongs to the technical field of petrochemical engineering energy. The method comprises the steps of carrying out catalytic hydrogenation on coal tar to obtain a coal tar system subjected to hydrogenation pretreatment, mixing the coal tar system subjected to hydrogenation pretreatment with biomass oil to obtain a mixed oil system, continuously carrying out catalytic hydrogenation on the mixed oil system, and carrying out rectification treatment to obtain a gasoline and diesel oil product, wherein the coal tar system subjected to hydrogenation pretreatment is subjected to catalytic hydrogenation to form a hydrogen-donor solvent, and hydrogen free radicals are utilized to perform hydrodeoxygenation on the biomass oil. The system disclosed by the invention is provided with a plurality of staged reactors, so that the staged catalytic hydrogenation reaction is realized, and the coal tar is subjected to hydrogenation pretreatment and then is mixed with the biomass oil for catalytic hydrogenation. Compared with a single raw material hydrogenation technology, the hydrogenation speed is high, the coking influence is small, and the raw material adaptability is also improved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical energy, and relates to a method and a system for preparing gasoline and diesel by mixing and hydrogenating coal tar and biomass oil. Background technique [0002] Coal occupies a considerable proportion of my country's energy consumption structure, but the traditional coal chemical production model has been relatively extensive, leading to problems such as overcapacity and declining profits. With the development of my country's economy and refined oil industry in recent years, my country's dependence on foreign crude oil has shown an increasing trend year by year, which has restricted the development of the national energy security strategy. New coal chemical technologies for the production of fuel oil products using coal tar as raw materials have been developed. The sustainable development of our country's economy is of great significance. At present, coal tar hydrogenation technology mainl...

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Problems solved by technology

[0004] In actual production and use, due to the high viscosity and high content of mechanical impurities of coal tar, the source resources of coal tar raw materials that can be used for reaction hydroprocessing are insufficient; the sources of raw materials for hydrogenation of biomass oil are scattered and the quality is difficult to control , making the hydrogenation reaction high in hydrogen consumption and difficult. In addition, the biomass oil hydrogenation process has low adaptability to raw materials

Therefore, due to the above current situation, the separate hydrogenation of coal tar and biomass oil has the problems of insufficient raw material sources and difficult hydrogenation.

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