Process method for reducing olefins by hydrogen desulfurization of catalytic gasoline

Abstract

The invention relates to a process method for reducing olefins by the hydrogen desulfurization of catalytic gasoline, which comprises the following steps of: cutting gasoline into a light distillate and a heavy distillate at the cutting point of between 60 and 80 DEG C; contacting the heavy distillate and hydrogen with an octane value restoration catalyst to perform an isomerization reaction, an aromatization reaction and a building-up reaction; and contacting reaction effluents which are not separated with a selective hydrogen desulfurization catalyst to perform a hydrogen desulfurization reaction, and separating hydrogenated generation oil to obtain light hydrocarbons and gasoline distillates, wherein hydrogen-enriched gas is recycled, the octane value restoration catalyst is used for loading one or two VIB or VIII group metal as active ingredients by taking one or more of aluminum oxides or molecular sieves as a carrier, an aid is one or two oxides in IIB groups or lanthanide series, the selective hydrogen desulfurization catalyst takes the aluminum oxides as the carrier, Mo and Co as active metal and one or more of Ce, Mg, K, P and F as the aid, the olefin content is less than 20 volume percent, the sulfur content is less than 50 micrograms / gram, and research octane number (RON) is improved by 1.5 to 2 units.

Description

technical field [0001] The invention relates to a process method for catalytic cracking gasoline hydrogenation desulfurization and olefin reduction, in particular to a method for secondary processing full fraction gasoline hydrogenation upgrading such as FCC. Background technique [0002] At present, there are certain restrictions on the sulfur content and olefin content of gasoline products. The content of sulfur and olefins in secondary processed gasoline such as FCC is high. Therefore, reducing the content of sulfur and olefins in secondary processed gasoline such as FCC is the key to solving the quality of FCC gasoline. [0003] FCC gasoline desulfurization and olefin reduction using the traditional hydrofining process will result in a large loss in the octane number of the product, 7 to 10 units of RON, and increased hydrogen consumption; the selective hydrodesulfurization method will reduce the sulfur content It can be removed to a very low level, but the reduction in...

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Problems solved by technology

However, the final distillation point of the raw materials used in this method is relatively high, and the reaction temperature in the hydrofining section is too high to saturate the aromatics, resulting in a large loss of RON, which is difficult to recover

[0006] CN1621495A discloses a low-quality gasoline hydrotreating and upgrading process. The raw gasoline is cut into light fractions and heavy fractions at 60-90°C. The heavy fractions are mixed with hydrogen, and then contacted with a hydrodesulfurization catalyst. The reaction effluent Carry out the aromatization modification reaction by contacting with the aromatization modification catalyst, but the gasoline sulfur content obtained by using the catalyst described in this method is still quite high as 150ppm

This method adds a separator between the first and second stages, which increases equipment investment, and at the same time, the operating pressure is too low, which is not conducive to the long-term operation of the catalyst.

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