An axial-radial composite fixed-bed catalytic reactor for oxidative dehydrogenation of butene

Abstract

The invention relates to an axial and radial combined type fixed bed catalytic reactor for olefince oxidative dehydrogenation. The axial and radial combined type fixed bed catalytic reactor comprises a reactor shell, wherein a raw material gas inlet is formed in the top of the reactor shell; a product gas outlet is formed in the bottom of the reactor shell; at least one axial reaction section, a radial reaction section and an inter-section chilling section are arranged in the reactor shell; the inter-section chilling section is positioned between each axial reaction section and the radial reaction section. Compared with the prior art, the axial and radial combined type fixed bed catalytic reactor disclosed by the invention can easily realize enlargement, effectively control the reaction temperature and reduce pressure drop of a bed layer, so that the utilization rate of obtained energy is high, and the productivity is high; meanwhile, the difficulty in designing and operating an original heat exchanger can be effectively reduced; the utilization efficiency of reaction heat is improved.

Description

technical field [0001] The invention relates to the design of a butene oxidative dehydrogenation reactor, in particular to an axial-radial composite fixed-bed catalytic reactor for butene oxidative dehydrogenation, which is mainly used in the field of industrial preparation of butadiene. Background technique [0002] Butadiene is the simplest diene with conjugated double bonds, easy to undergo oligomerization and polymerization, and also easy to copolymerize with other unsaturated compounds with double bonds. It is mainly used to produce cis-butadiene rubber, styrene-butadiene rubber, butadiene Nitrile rubber and ABS resin, etc., are also an important coating and organic chemical raw materials. Affected by the lighter feedstock of ethylene cracker, the new butadiene production capacity of the extraction method will be more and more difficult to meet the demand. Oxidative dehydrogenation of butene has gradually become one of the main production routes of butadiene due to its...

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Problems solved by technology

Although the radial fixed bed reactor can reduce the pressure drop of the bed layer and is easy to realize large-scale, but the energy utilization rate of this patent is low, and at the same time, the load of the front heat exchanger is too large

[0005] At present, the butadiene oxidative dehydrogenation plant generally adopts the axial fixed-bed reactor in the industry. This type of reactor has a simple structure, but with the increase of the production Due to the limitation of pressure drop and reactor diameter, it cannot be scaled up. At present, the production capacity is mainly solved by increasing the number of reactors. Therefore, it is necessary to develop a new type of reactor that is easy to scale up.

In addition, since the outlet temperature of the reactor is as high as 570°C, it brings great inconvenience to the design and operation of the front heat exchanger used to recover the reaction heat

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