Catalytic process for selective hydrodesulfurization of gasoline

Abstract

The invention relates to a catalytic process for selective hydrodesulfurization of gasoline, which comprises the following steps of: performing hydrodesulfurization reaction on heavy gasoline obtained by cutting and fractionating catalytic gasoline under a hydrogenation condition through a catalyst bed, mixing the heavy gasoline and light gasoline subjected to alkaline cleaning, and removing mercaptan to obtain a blended gasoline product, wherein reaction conditions of hydrodesulfurization of the heavy gasoline are that: the temperature is between 150 and 450 DEG C, the pressure is between 1.0 and 5.0MPa, the liquid hourly space velocity is between 1.0 and 6.0 h<-1>, and the hydrogen-gasoline ratio is between 50 and 1,000v / v; and the catalyst takes monomers of Al2O3, TiO2, MgO, SiO2 or composite oxides as a carrier, takes Mo or W and Co or Ni metal as active ingredients and takes P, B or Mg as a modifier. The method can greatly reduce the sulfur content of the catalytic gasoline, wherein the desulfurization rate is no less than 80 percent; and the method can make the octane number loss of gasoline products less, wherein the octane number loss is no more than 1.5 units.

Description

technical field [0001] The invention relates to a gasoline selective hydrogenation desulfurization process, in particular to a hydrogenation treatment method for producing low-sulfur gasoline from catalytic gasoline with high total sulfur and olefin content. Background technique [0002] At present, the representative process technologies at home and abroad mainly include the SCANfining process developed by Exxon Mobil, the IFP Prime-G+ process developed by the French Petroleum Research Institute; the RIDOS and RSDS processes developed by the Beijing Petroleum Science Research Institute, and the Fushun Petrochemical Research Institute. The OCT-M process. It is characterized by fractional distillation of gasoline into light and heavy parts. The heavy part is hydrodesulfurized with a special catalyst, and then blended with the light part to remove mercaptans. The reaction temperature is about 240 ° C ~ 400 ° C. The above-mentioned processes all need to be equipped with specia...

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Problems solved by technology

From the search results of domestic and foreign patent literature on catalytic gasoline hydrodesulfurization and the analysis results of the sulfur content and olefin content of FCC gasoline in my country, it can be seen that there is no special catalyst for hydrodesulfurization of FCC gasoline with high olefin and high sulfur content in China. no specialized technology

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