A countercurrent continuous reforming reaction method

Abstract

A countercurrent continuous reforming reaction method, comprising loading catalysts into a countercurrent continuous reforming device, raising the temperature of each reactor to 350-420°C, feeding reforming raw materials with a designed feed amount of 50-75% by mass and injecting Sulfur, so that the sulfur content in the feed is 1.0μg / g-50μg / g, and the temperature of each reactor is raised to 460-480°C. When the concentration of hydrogen sulfide in the circulating gas reaches 2.0μL / L-30μL / L, the feed Adjust the sulfur content in the feed to 0.6-2.0μg / g, raise the temperature of each reactor to 490-510°C, and when the water content in the reforming cycle gas is lower than 50μL / L, reduce the sulfur content in the reforming feed Control it at 0.6-2.0 μg / g, feed the reforming raw material according to the designed amount, and continue to raise the temperature. When the carbon content of the catalyst in the last reactor reaches 1.0-4.0 mass%, its temperature is no longer raised, and the other reactors are The temperature of the reactor is maintained or raised to a stable reforming reaction temperature, the cyclic regeneration of the catalyst is started, and the chlorine content in the regenerated catalyst is controlled to be 0.8-1.05% by mass. This method can effectively reduce the amount of carbon deposits on the final reverse catalyst, so that the regenerated catalyst can maintain good 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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