Countercurrent continuous reforming reaction method

Abstract

The invention provides a countercurrent continuous reforming reaction method. The method includes the following steps: loading a catalyst in a countercurrent continuous reforming device, heating eachreactor to 350-420 DEG C, introducing a reforming raw material with a mass of 50-75%of a designed feed amount, injecting sulfur to make the content of sulfur in feed is 1.0-50 [mu]g / g, heating each reactor to 460-480 DEG C, when the concentration of hydrogen sulfide in circulating gas reaches 2.0-30 [mu]L / L, adjusting the content of the sulfur in the feed to 0.6-2.0 [mu]g / g, heating each reactor to 490-510 DEG C, when the content of water in the reforming circulating gas is less than 50 [mu]L / L, controlling the content of sulfur in the reforming feed to be 0.6-2.0 [mu]g / g, introducing a reforming raw material according to a designed amount, continuing heating, when the carbon content of a catalyst in a last reactor reaches 1.0-4.0% by mass, stopping heating, maintaining the temperature ofother reactors or raising the temperature of other reactors to a stable reforming reaction temperature, starting cycle regeneration of the catalyst, and controlling the chlorine content in the regenerated catalyst to be 0.8-1.05% by mass. The method can effectively reduce the carbon deposit amount of a catalyst in a last reactor, so that the regenerated catalyst can maintain better catalyst performance under the condition of countercurrent circulation.

Description

technical field [0001] The invention is a continuous reforming reaction method, specifically, a continuous reforming reaction method under the condition of regenerated catalyst countercurrent circulation. Background technique [0002] In the traditional naphtha continuous reforming process, the reactants flow sequentially from the first reactor to the fourth reactor, and the regenerated catalyst first enters the first reactor, then passes through the second reactor, the third reactor, the Four reactors, return to regenerator. The flow direction of the reactant in the reactor is the same as that of the catalyst, which is called "co-current continuous reforming process". The characteristic of the downstream continuous reforming process is that from the first reactor to the fourth reactor, the carbon content of the catalyst gradually increases along its flow direction, and the activity gradually decreases; Reactions such as dehydrogenation are mainly carried out in the first ...

AI Technical Summary

Problems solved by technology

However, due to the change of the catalyst circulation mode, the countercurrent continuous reforming process makes the catalyst carbon deposition law and reforming reaction law obviously different from the downstream continuous reforming process. When it operates under high severity reaction conditions, according to the existing technical scheme control, it will greatly increase the amount of carbon deposits in each anti-catalyst, significantly reduce the activity and selectivity of the catalyst, and reduce the economic benefits of the device

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