A large axial multi-stage mixed heat exchange butene oxidative dehydrogenation reactor

Abstract

The invention relates to a large-scale axial multistage-mixing heat exchange type oxydehydrogenation reactor for butylene. The reactor comprises a reactor housing, a mixing arrangement which is arranged at the upper part of the reactor housing, at least two axial catalyst bed layers in the reactor housing, and at least one direct heat exchange segment; the direct heat exchange segment is located between the two axial catalyst bed layers, a cold torrent is introduced into the direct heat exchange segment in the reactor casing, the cold torrent and outlet materials which are reacted with the axial catalyst bed layer above the direct heat exchange segment are mixed for direct heat exchange, and a mixture enters the axial catalyst bed layer below the direct heat exchange segment for carrying out a reaction. Compared with the prior art, the reactor has the advantages of large-scale, effective control of reaction temperature, reduced bed layer pressure, high energy utilization rate, and good production capacity.

Description

technical field [0001] The invention relates to the technical field of chemical reaction engineering, in particular to a large axial multi-stage mixed heat exchange type butene oxidation dehydrogenation reactor. Background technique [0002] Butadiene is the basic raw material for the production of styrene-butadiene rubber SBR, ABS resin, polybutadiene rubber BR, etc., and is also a key intermediate for the production of chemicals such as adiponitrile, chloroprene, sulfolane, and vinyl cyclohexene. Wide range of uses. Oxidative dehydrogenation of butene is an important method for producing butadiene, butene mainly generates butadiene through the partial oxidative dehydrogenation of butene through the following main reaction: [0003] C 4 h 8 +0.5O 2 =C 4 h 6 +H 2 o [0004] Butene and butadiene are further oxidized through the following side reactions to produce CO by-products, respectively 2 : [0005] C 4 h 8 +6O 2 =4CO 2 +4H 2 o [0006] C 4 h 6 +5.5O 2...

AI Technical Summary

Problems solved by technology

Although the radial fixed bed reactor can theoretically reduce the pressure drop of the bed layer, in order to ensure the uniform distribution of the reaction gas in the reactor, a distributor with a low opening ratio must be used, which will inevitably lead to a large pressure drop in the distributor , not well suited for butene oxidative dehydrogenation reaction system

[0012] At present, industrial butadiene oxidative dehydrogenation plants generally use multiple axial adiabatic fixed-bed reactors connected in series. Although the structure of the reactor is simple, the capacity of a single unit is limited. The system uses radial reactors for industrial production, mainly due to the limitation of fluid distribution and has not been reported. In order to change the current situation of increasing the number of reactors to solve the production capacity, it is necessary to develop a new type of reactor that is easy to scale up

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