Preparation and use method of a coking benzene hydrodesulfurization catalyst

Abstract

A method for hydrodesulfurization of coked benzene, wherein the preparation process of the hydrodesulfurization catalyst used in the hydrodesulfurization reaction is: adding aluminum oxide and titanium dioxide mixed powder carriers to solutions containing molybdenum, nickel, cobalt, and tungsten active metal elements respectively The solution contains citric acid; the NaZSM‑5 molecular sieve is added to the solution containing copper and / or zinc for impregnation; after drying and roasting, the two are mixed, and the coking benzene is treated by a rectification tower before hydrodesulfurization , and then complete sulfur removal through pre-hydrogenation, main hydrogenation and inorganic sulfur removal processes. The NaZSM-5 molecular sieve loaded with active ingredients has a selective adsorption effect on thiophene; the mixed powder of aluminum oxide and titanium dioxide loaded with active metals has a good catalytic hydrogenation effect on thiophene, and the two synergistically work together to achieve a low reaction rate. Excellent removal effect can also be achieved at low temperature, citric acid can promote the formation of active phase, improve the hydrogenation activity of the catalyst and prolong the retention time of the catalyst activity.

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 symbols. 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 co...

AI Technical Summary

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