Method for improving selectivity of catalyst

Abstract

The invention relates to a method for improving selectivity of a catalyst. A catalyst selectivity regulation and control process is increased between a desulfurization process and a normal production process, and the catalyst selectivity regulation and control process is that activity catalytic raw materials are in contact with the catalyst for 24-96h in an atmosphere of activity catalytic gas under activity catalytic reaction conditions, wherein the activity catalytic gas comprises hydrogen gas and hydrogen sulfide, and based on the whole activity catalytic gas, the volume fraction of the hydrogen gas is not less than 70%, and the volume fraction of hydrogen sulfide is 0.2%-5%; and the normal production process is that gasoline raw material is in contact with the catalyst in the atmosphere which is rich in the hydrogen gas under normal reaction conditions to be in hydrogenation reaction. By adopting the method provided by the invention, the selectivity of the catalyst can be improved. Compared with the prior art, under the situation that the sulfur content in a gasoline product is the same, the olefin saturation rate is lower and the loss in octane number of a product is smaller.

Description

technical field [0001] The present invention relates to a method for improving catalyst selectivity. Background technique [0002] As we all know, air pollution is a serious environmental problem, and a large number of engine emissions are one of the important causes of air pollution. In recent years, in order to protect the environment, countries around the world have put forward stricter restrictions on the composition of engine fuel, especially the sulfur content. The standards implemented in Beijing and Shanghai require the sulfur content in gasoline to be less than 50 μg / g. [0003] The processing capacity of catalytic cracking in my country accounts for a relatively large proportion of secondary processing, and catalytic cracking gasoline is the main source of commercial gasoline, and other gasoline components are few, and the blending ability is poor. Judging from the various blending components in the gasoline pool, the sulfur in catalytic cracking gasoline is the ...

AI Technical Summary

Problems solved by technology

However, if the sulfur content of catalytic cracking gasoline is to be further reduced to less than 50 μg / g, the operating severity of the catalytic cracking raw material hydrogenation unit must be greatly increased, which is very uneconomical economically.