Fluidizer and technique for preparing ethylene by ethanol dehydration

Abstract

The invention relates to a fluidized device for producing ethylene by ethanol dehydration, which comprises a fluidized bed reactor, a regenerator, a catalyst riser, a stripper and a regenerated catalyst degassing tank, wherein, the stripper and the regenerator are connected by spent catalyst conveying pipes, the fluidized bed reactor and the catalyst riser are connected directly, the regenerated catalyst degassing tank and the regenerator are connected by regenerated catalyst conveying pipes, the regenerated catalyst degassing tank and the catalyst riser are connected by the regenerated catalyst conveying pipes and an external heat collector is positioned in the regenerated catalyst degassing tank. The fluidized device, through adding the regenerated catalyst degassing tank, effectively removes flue gas taken by the regenerated catalyst and greatly improves the purity of ethylene in the product. The regenerator is arranged independently or a catalytic cracking regenerator is shared with a catalytic cracking device in the field of petroleum refining.

Description

technical field [0001] The present invention pertains to an apparatus and method for the preparation of hydrocarbons from a non-hydrocarbon compound, and more particularly to an apparatus and method for the dehydration of an oxygenate to prepare ethylene. Background technique [0002] Ethylene is the most important basic raw material in the petrochemical industry. At present, about 75% of petrochemical products come from ethylene. At present, the world's ethylene production capacity has reached 112.9055 million tons per year, and it is expected that the world's ethylene production capacity will reach 144.455 million tons per year in 2012. In 2010, my country's ethylene equivalent demand is expected to be 25.7 million tons per year, the production capacity is 13.89 million tons per year, and the self-sufficiency rate is only 54%. Therefore, whether it is domestic or foreign, there is still a lot of room for the development of the ethylene market. [0003] There are many ways...

AI Technical Summary

Problems solved by technology

[0010] The main problem of using a fluidized bed reactor for ETE is that the regenerated catalyst entrains flue gas, which contains a large amount of impurity gases such as nitrogen, oxygen, carbon dioxide, carbon monoxide, etc., and the regenerated catalyst entrained with flue gas returns to the fluidized bed for reaction The device will increase the side reaction and greatly reduce the purity of ethylene in the product, requiring expensive cryogenic separation to improve its purity

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