Preparation of hydrodesulfurization catalyst for coking benzene and using method of the catalyst

Abstract

A hydrodesulfurization method of coking benzene is provided. A preparation process of a hydrodesulfurization catalyst used in a hydrodesulfurization reaction includes: respectively dipping an aluminium oxide-titanium dioxide mixed power carrier into solutions containing active metal elements comprising molybdenum, nickel, cobalt and tungsten, with the solutions containing citric acid; dipping a NaZSM-5 molecular sieve into a solution containing copper and/or zinc; drying; calcinating; mixing the dipped aluminium oxide-titanium dioxide mixed power carrier and the dipped NaZSM-5 molecular sieve; processing the coking benzene by a rectifying tower before hydrodesulfurization; and performing pre-hydrogenation, main hydrogenation and removal of inorganic sulfur to finish sulfur removal. The NaZSM-5 molecular sieve loaded with an active component has an effect of selective adsorption for thiophene. The aluminium oxide-titanium dioxide mixed power carrier loaded with the active metals has good catalytic hydrogenation effects for the thiophene. By cooperation of the NaZSM-5 molecular sieve loaded with the active component and the aluminium oxide-titanium dioxide mixed power carrier loaded with the active metals, good removing effects can be achieved even at a low reaction temperature. The citric acid promotes formation of an active phase, improves hydrogenation activity of the catalyst and prolongs maintaining time of the activity of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of hydrorefining of coked benzene, and in particular relates to a method for preparing and using a catalyst for hydrodesulfurization of coked benzene. Background technique [0002] Benzene is an important petrochemical basic raw material, which is widely used in the production of synthetic rubber, plastics, fibers, fuels, pesticides, and medicines, and can also be used as a solvent. One of the important signs. At present, the raw material used to produce benzene and other chemical products is mainly petroleum benzene. With the development of economy, petroleum as a non-renewable resource is decreasing day by day, and coking benzene has gradually become an important raw material for benzene production. my country is rich in coking benzene resources. With the rapid development of the coal chemical industry, the proportion of coking benzene in the total benzene production has risen to nearly 30%. The high cont...

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention lies in the problems of higher hydrogenation temperature and higher operating energy consumption required in the existing process for refining coked benzene by catalytic hydrotreating to achieve a higher thiophene removal rate, and then provide a A method for preparing a coked benzene hydrodesulfurization catalyst that has high dethiophene efficiency and can significantly reduce the hydrogenation reaction temperature; the present invention also provides a method for hydrotreating coked benzene using the hydrodesulfurization catalyst