Method for reducing contents of sulfur and olefin in catalytically cracked gasoline

Abstract

The invention discloses a method for reducing the contents of sulfur and olefin in catalytically cracked gasoline. The method comprises the following steps: by using catalytic gasoline as a raw material, firstly, cutting and fractionating by virtue of a fractionating tower to obtain light gasoline and heavy gasoline, wherein the light gasoline enters into a fixed bed reactor for physical absorption desulfurization without hydrogen, the content of olefin is not reduced by physical absorption desulfurization, and the octane number of the light gasoline is not damaged; mixing the heavy gasoline with hydrogen and feeding the mixture into a selective hydrogen desulfurization fixed bed reactor, wherein the reaction product further enters into a hydro-upgrading fixed bed reactor and the modified heavy gasoline is mixed with a physical absorption desulfurization product without hydrogen of the light gasoline; and carrying out hydrogen desulfurization and hydro-upgradation on the heavy gasoline. As the olefin content of the heavy gasoline is less and the octane number of the light gasoline is low, the octane number of the heavy gasoline is less in loss under the condition that a relatively high desulfurization rate is maintained. The method disclosed by the invention can be used for producing clean gasoline which meets the sulfur requirements of European IV and European V, and the equipment investment is saved, the adsorbent is convenient to fill and the loss of the octane number is less.

Description

technical field [0001] The invention relates to a method for deep desulfurization and olefin reduction of catalytic cracking gasoline, which belongs to the technical field of petroleum processing. Background technique [0002] The main problem of gasoline quality in my country is the high content of sulfur and olefins, because the proportion of catalytic cracked gasoline in the gasoline pool is too high. In my country, FCC gasoline is the main blending component of gasoline, accounting for more than 75%. Using catalytic cracking olefin reduction catalysts, additives and new catalytic cracking technology can reduce the olefin content in catalytic gasoline After passing through the traditional selective hydrodesulfurization process, the olefin content will be further reduced, and then through deployment, the refinery gasoline can reach an olefin content of less than The goal. However, it is difficult to meet the requirement that the sulfur content is less than 50 μg / g or ...

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Problems solved by technology

[0007] Although the adsorption desulfurization catalyst has a good removal effect on sulfide in gasoline, the adsorption desulfurization of the patent CN101845322 operates under the condition of hydrogen, which will saturate the olefins in catalytic cracking gasoline, especially light gasoline for adsorption desulfurization. The olefin components in gasoline have a high octane number, which will cause a large loss of gasoline octane number

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