A π-type butene oxidative dehydrogenation fixed-bed radial reactor

Abstract

The invention discloses a radial reactor of an n-type butane oxidization dehydrogenation fixed bed, i.e. a fixed bed radial reactor with the flowing direction of reaction gas in a diversion runner (13) and a collecting runner (14) being opposite. The reactor adopts a cylindrical vessel with a catalytic bed layer (6), and a reaction gas inlet (1) and a reaction gas outlet (12) are arranged on the same end of the cylindrical vessel. The cylindrical vessel internally comprises a porous-wall cylindrical inner distribution tube (9), a porous-wall cylindrical outer distribution tube (8) and a catalytic bed layer (6). The flowing direction of the reaction gas on the catalytic bed layer (6) in the reactor is in a centrifugal form or a centripetal form. In order to meet the oxidization dehydrogenation normal pressure reaction requirement, the inner distribution tube and the outer distribution tube are high in perforation rate, the fluid uniform distribution control on the reaction gas is not implemented by the barrel, the distribution tubes have no control pressure drop; moreover, by adopting the runner setting method, the radial reactor has the advantages of low pressure drop, good reaction property, convenience for filling a catalyst, easiness in realizing upsizing and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical reaction engineering, and in particular relates to a fixed-bed radial reaction device suitable for producing butadiene by oxidative dehydrogenation of butene. Background technique [0002] Butadiene is an important basic petrochemical raw material. Its biggest application is to produce synthetic rubber such as styrene-butadiene, nitrile and butadiene. It is also widely used in the synthesis of synthetic resin, synthetic fiber and fine chemical products. [0003] Oxidative dehydrogenation of butene is an important synthetic method for the production of butadiene. The reaction principle is that in the presence of a large amount of water vapor, butene and oxygen undergo dehydrogenation reaction under the action of a catalyst to generate butadiene and water. The current industrial butene oxidative dehydrogenation reactor is usually in the form of a fixed-bed reactor, which has the advantages of high ...

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Problems solved by technology

[0008] 1. For the existing axial fixed-bed reactor, it is limited by the reaction characteristics of butene oxidative dehydrogenation, and the catalytic bed layer is thin, which limits the scale-up of the device

A domestic 100,000-ton / year butene oxidative dehydrogenation unit adopts the form of axial fixed-bed reactors, and has to be completed by connecting four reaction production lines in parallel, which makes it impossible to further increase the production scale of a single reactor and greatly increases the cost of the process. Control costs and manage costs

[0009] 2. For the existing normal pressure butene oxidative dehydrogenation fixed bed radial reactor, since the flow of the fluid in the flow channel is a momentum exchange type, a Z-type flow form is adopted, and the reactant gas flows between the split flow channel and the collecting flow channel. The static pressure distribution does not match, which is very unfavorable for the uniform distribution of fluid along the axial direction

In order to realize the uniform distribution of the fluid, it is necessary to use a gas distributor with uniform fluid control and a large pressure drop. For example, in the British patent GB1118750 and the Chinese patent CN87102931, the pressure drop caused by the porous cylinder is double or even several times that of the catalytic bed layer. To achieve a uniform distribution of the fluid, but this method is seriously in violation of the requirements of butene oxidative dehydrogenation atmospheric pressure reaction

Therefore, the technical problem of the existing radial reactor for oxidative dehydrogenation of butene is that it is unable to ensure the uniform distribution of the fluid and realize the dilemma of low pressure drop.

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