Propane dehydrogenation process involving catalyst regeneration and reactor double-online switching

Abstract

The invention relates to a propane dehydrogenation process involving catalyst regeneration and reactor double-online switching, wherein the propane dehydrogenation process comprises a catalytic dehydrogenation process and a catalyst regeneration process. According to the process, raw materials exchange heat with product gas flowing out of a last-stage reactor in a heat exchanger; the heat exchanged raw materials are heated by a heating furnace, and the heated raw materials enter reactors, wherein each stage of a reactor is provided with an intermediate heating furnace; process gas is heated toa reaction temperature through the heating furnace and enters a next-stage reactor, wherein the last-stage reactor is provided with two reactors of an operation reactor and a standby reactor, and thetwo reactors can be freely switched; the product gas flowing out of the last-stage reactor exchanges heat with the raw materials, then is cooled and then enters a separation system and is separated;and the final product propylene is obtained, wherein the to-be-regenerated catalyst participating in the reaction from the last-stage reactor is elutriated and burnt after being collected by a catalyst collector to obtain the regenerated catalyst, and the regenerated catalyst sequentially enters the reactors at all stages to participate in the reaction, so that the catalyst is recycled.

Description

technical field [0001] The invention relates to the field of propane dehydrogenation to produce propylene, in particular to a propane dehydrogenation process involving catalyst regeneration and dual online switching of reactors Background technique [0002] At present, there are two main processes for propane dehydrogenation to propylene in the world, namely the UOP process in the United States and the Lummus process in the United States. [0003] The main difference between the above two processes is mainly the difference in the catalyst. [0004] The fixed bed in the Lummus process uses chromium-based catalysts. The chromium-based catalysts are poisonous, and it is difficult to treat the catalysts after they are scrapped. [0005] The UOP process uses a platinum-based catalyst, which is non-toxic, has good thermal stability, and low investment, which is why it currently occupies a relatively large domestic market share. [0006] UOP process: After mixing propane with a c...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a propane dehydrogenation process involving catalyst regeneration and reactor double-online switching, which solves the problems of short reactor operation period and frequent maintenance, and has the characteristics of saving cost, increasing production, and increasing operation period.

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