Method for producing ultralow-sulfur cleaning gasoline through full-distilling hydrogen desulfurization of catalytic gasoline

Abstract

The invention relates to a method for producing ultralow-sulfur cleaning gasoline through full-distilling hydrogen desulfurization of catalytic gasoline. The method mainly solves the problems of the prior art that the process flow of hydrogen desulfurization of catalytic gasoline is complex, the reaction condition is rigorous, the saturation ratio of the gasoline olefin after being subjected to hydrogen desulfurization is ultrahigh, the loss of octane value is big, and the like. The method comprises the following steps of: firstly, mixing hydrogen with the full-distilling catalytic gasoline, and then entering into a hydrogenation unit; removing alkadiene in the mixture while causing a part of hydrocarbon to perform isomerization reaction; placing a product obtained by pre-hydrogenating into a selective hydrogenating desulfurization unit; removing majority of sulfides in the product by performing the selective hydrogenating desulfurization reaction while maximally protecting the olefin from being saturated; and finally removing the hydrogen sulfide from the gasoline after being subjected to the selective hydrogenating desulfurization by a hydrogen sulfide removing unit, thereby obtaining a cleaning product of gasoline. According to the technical scheme, the problem is more efficiently solved. The method is suitable for the industrial production of the catalytic gasoline with low-sulfur high-octane value.

Description

technical field [0001] The invention relates to a method for producing ultra-low-sulfur clean gasoline by hydrogenating whole fractions of catalytic gasoline, which is suitable for hydrodesulfurization and upgrading of gasoline. Background technique [0002] The promulgation of increasingly stringent environmental protection regulations in various countries has increasingly stringent requirements on the composition of vehicle fuels. On July 1, 2007, my country's national III standard for motor gasoline was officially implemented nationwide. However, due to the limitation of the technical level of quite a few refineries, the clean gasoline that meets the National III standard still cannot meet the demand nationwide. However, the National IV standard gasoline requires lower sulfur content (sulphur content less than 50 μg / g), resulting in high production costs, which is difficult for most petrochemical companies and markets to accept, and can only be used in a few cities at pr...

AI Technical Summary

Problems solved by technology

[0011] The above technologies all adopt the method of fractionating catalytic gasoline into two or more fractions for staged treatment, and some adopt hydrodesulfurization and saturated olefins first, which will lose a lot of octane number (RON), and then through isomerization and aromatization However, the loss is always greater than the recovery value. During the recovery process, a certain loss of liquid yield is caused, which leads to a reduction in the economic benefits of the refinery. Public and non-public Reported octane losses were all above 1.5 units

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