Gas pre-distributor of fixed-bed reactor for preparing maleic anhydride through n-butane oxidation

A technology of fixed bed reactor and gas predistributor, which is applied in the fields of chemical instruments and methods, organic chemistry, chemical/physical process, etc. It can solve the problem of uneven gas distribution of reactants, uneven use of catalysts, and n-butane conversion Low efficiency and other problems, to achieve the effect of improving catalyst utilization, improving the influence of local impact unevenness, and improving conversion rate

Active Publication Date: 2013-05-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process of selective oxidation of n-butane to maleic anhydride, there are often problems such as uneven distribution of reactant gas flow, inability of the catalyst to be fully utilized uniformly, low conversion of n-butane and low selectivity of maleic anhydride

Method used

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  • Gas pre-distributor of fixed-bed reactor for preparing maleic anhydride through n-butane oxidation
  • Gas pre-distributor of fixed-bed reactor for preparing maleic anhydride through n-butane oxidation
  • Gas pre-distributor of fixed-bed reactor for preparing maleic anhydride through n-butane oxidation

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Embodiment 1

[0034] As shown in Figure 3(a), the gas predistributor for the fixed bed reactor of the present invention includes horizontal guide vanes 2, guide pipes 3 and cones arranged independently in sequence along the central axis of the gas inlet pipe 1 of the fixed bed reactor. Shaped cap 4, horizontal deflector 2, guide pipe 3 and conical cap 4 are all located in the area between the gas inlet of the fixed bed reactor and the gas distribution plate 5, and the horizontal guide vane 2 is close to the gas of the fixed bed reactor. Inlet; one end of the draft tube 3 is opposite to the mouth of the conical cap 4, and the other end is close to the horizontal deflector 2; the conical tip of the conical cap 4 is far away from the gas inlet of the fixed bed reactor.

[0035] For a reactor with an inner diameter of 3000mm, the optimized structure of the gas predistributor is selected: the horizontal deflector 2 is circular, the ratio of the outer diameter to the inner diameter is 1.05~1.7:1, ...

Embodiment 2

[0037] In a tubular gas-solid fixed-bed reactor with a diameter of 3039mm, air is used as the gas between the tubes, and the inlet gas velocity is 17.7m / s, and the Fluent fluid dynamics simulation calculation software is used for simulation. The form of the gas pre-distributor is shown in Figure 3 (a): wherein, the inner diameter of the annular horizontal deflector 2 is 700 mm, and the distance from the gas inlet is 150 mm; the diameter of the end port of the guide tube 3 close to the gas inlet pipe 1 is 400mm, the included angle between the pipe wall of the draft tube 3 and the central axis of the gas inlet pipe 1 is 45°, and the height of the draft tube 3 is 282.84mm; A conical cap 4 is arranged at 200 mm from the port at one end, and the conical angle of the conical cap 4 is 90°.

[0038] Figure 4(a) is the gas velocity cloud diagram in the gas predistributor under the operation of producing a certain chemical product, and Figure 4(b) is the low gas velocity cloud diagram i...

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Abstract

The invention discloses a fixed-bed reactor and a method for preparing maleic anhydride through n-butane oxidation. A gas inlet is formed in one end of a reactor main body; a gas pre-distributor is arranged in one end of the reactor main body and one end of the reactor main body is connected with the gas inlet; a material outlet is formed in the other end of the reactor main body; a heat exchanging medium fused salt outlet and a heat exchanging medium fused salt inlet are formed in the side wall of the reactor main body; a plurality of catalyst filling pipes are arranged in the reactor main body; gas distribution plates are respectively arranged at the two ends of the plurality of catalyst filling pipes, wherein a second homogenizing space is formed between one distribution plate and the gas inlet; a first homogenizing space is formed between the other distribution plate and the material outlet; heat exchanging medium fused salts are filled between the plurality of catalyst filling pipes; and the gas pre-distributor comprises a horizontal flow deflector, a flow guide pipe and a conical cap. According to the invention, the area of a low gas speed area can be reduced; and moreover, the influences on local impact nonuniformity of the distribution plates are improved, the stability in operation is improved and the fixed-bed reactor can be applied to industrial production of the maleic anhydride.

Description

technical field [0001] The invention relates to the field of gas predistributors, in particular to a fixed-bed reactor for producing maleic anhydride by n-butane oxidation and a method thereof. Background technique [0002] Maleic anhydride, also known as maleic anhydride, is an important organic chemical raw material and the third largest organic anhydride in the world after phthalic anhydride and acetic anhydride. It is widely used in petrochemical, food processing, and pharmaceutical industries. , Building materials and other industries. Due to the advantages of cheap raw materials, relatively light pollution, high utilization rate of carbon atoms and low production cost of maleic anhydride, n-butane oxidation to maleic anhydride technology has gradually become the main route of maleic anhydride production, and has a tendency to gradually replace benzene oxidation . [0003] According to the reactor type, the process of producing maleic anhydride by n-butane oxidation h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/06C07D307/60
Inventor 黄正梁陈楠杨遥廖祖维蒋斌波王靖岱阳永荣郑海俊娄俊毅冯翔陆飞鹏杨勇柳莺
Owner ZHEJIANG UNIV
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