A Catalytic Cracking Gasoline Adsorption Desulfurization Process

Abstract

The invention discloses a method for producing clean gasoline meeting Europe V sulfur index requirement through hydrogen adsorption desulfurization by a fixed bed process. Catalytic gasoline subjected to selective hydrogen desulfurization is used as the raw material (sulfur content is less than 150ug / g), cutting fractionation is carried out through a fractionating tower to be light gasoline and heavy gasoline. Light gasoline is not processed, and heavy gasoline enters a fixed bed reactor for hydrogen absorption desulfurization, and the reaction product mixed with the light gasoline obtained from fractionation can meet the Europe V sulfur index requirement. As the light gasoline is rich in olefin, and the olefin octane value of this part is high, loss of octane value can be avoided without hydrogen adsorption desulfurization. Adsorption desulfurization is carried out only on heavy gasoline, so that the treatment capacity of the fixed bed reactor is reduced; besides, the heavy gasoline is low in olefin content, and the olefin octane value is low, so that the octane value loss is low under the condition of high desulfurization rate. Through optimization of technical conditions, the one-way operation time of the desulfurization adsorbent can be improved to 1800 hours above.

Description

technical field [0001] The invention relates to a process for adsorption and desulfurization 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 further le...

AI Technical Summary

Problems solved by technology

This process performs hydrogen adsorption desulfurization on light gasoline, but the content of olefins in light gasoline is particularly high. More importantly, the octane number of these olefin components is very high, and hydrogen adsorption desulfurization will cause a large loss of octane number. In addition, the adsorption desulfurization of light gasoline with low sulfur content will also cause a certain loss of light gasoline, which is very uneconomical

[0007] Although the desulfurization adsorbent has a good removal effect on sulfur compounds in gasoline, the sulfur capacity of the desulfurization adsorbent is limited. Loss of activity, so the desulfurization adsorbent generally used for catalytic cracking gasoline has a one-way running time of only 30-300 hours, after which it needs to be regenerated and reduced before it can continue to be used

Therefore, the current industrial adsorption desulfurization device (S-zorb process) adopts the fluidized bed process, and the use of fluidized bed and moving bed reactors puts forward higher requirements for the design of desulfurization adsorbents. In addition, these two processes, desulfurization adsorption The reaction, regeneration and reduction of reagents are carried out in different reactors, which requires large investment and high energy consumption

With a fixed bed reactor, the reaction, regeneration and reduction of the desulfurization adsorbent can be carried out in the same reactor. Due to the limited sulfur capacity of the desulfurization adsorbent, frequent switching is required, and it is difficult to realize industrial application.

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