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Fixed-bed reactor and method for producing maleic anhydride by n-butane oxidation

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

Inactive Publication Date: 2014-10-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Fixed-bed reactor and method for producing maleic anhydride by n-butane oxidation
  • Fixed-bed reactor and method for producing maleic anhydride by n-butane oxidation
  • Fixed-bed reactor and method for producing maleic anhydride by n-butane oxidation

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Embodiment 1

[0054] Such as image 3 , Figure 4 As shown, it is the gas pre-distributor of the fixed bed reactor of the present invention, including the flow deflector 2 arranged above the gas inlet 1 of the fixed bed reactor, the top of the flow deflector 2 is provided with a gas distribution plate 4, and the flow deflector The deflector 2 is supported in the direction of the gas outlet of the gas inlet 1 of the fixed bed reactor through four deflector support rods 5. The deflector 2 is a conical deflector. Of course, the deflector 2 can also choose a hemispherical deflector. The wall surface of the deflector 2 is provided with a hollow part, and the hollow part of the wall surface of the deflector 2 is a first annular slit distributed along the radial direction of the deflector 2 . The first annular slit distributed along the radial direction of the deflector 2, the deflector 2 after the slit uses three straight rods 6 as a supporting framework, which is shaped like a cone and cuts out...

Embodiment 2

[0059] Such as Figure 5 As shown, it is the gas pre-distributor of the fixed bed reactor of the present invention, including the flow deflector 2 arranged above the gas inlet 1 of the fixed bed reactor, the top of the flow deflector 2 is provided with a gas distribution plate 4, and the flow deflector The deflector 2 is supported in the direction of the gas outlet of the gas inlet 1 of the fixed bed reactor through four deflector support rods 5. The deflector 2 is a hemispherical deflector. Of course, the deflector 2 can also choose a conical deflector. The wall surface of the deflector 2 is provided with a hollow part, and the hollow part of the wall surface of the deflector 2 is a first annular slit distributed along the radial direction of the deflector 2 . The distance between the deflector 2 and the wall surface where the gas inlet 1 of the fixed bed reactor is located is 100 mm to 400 mm. The number of first annular slits distributed along the radial direction of the d...

Embodiment 3

[0066] Such as Image 6 As shown, it is the gas pre-distributor of the fixed bed reactor of the present invention, including the flow deflector 2 arranged above the gas inlet 1 of the fixed bed reactor, the top of the flow deflector 2 is provided with a gas distribution plate 4, and the flow deflector The deflector 2 is supported in the direction of the gas outlet of the gas inlet 1 of the fixed bed reactor through four deflector support rods 5. The deflector 2 is a conical deflector. Of course, the deflector 2 can also choose a hemispherical deflector. The wall surface of the deflector 2 is provided with a hollow part, and the hollow part of the wall surface of the deflector 2 is a first annular slit distributed along the radial direction of the deflector 2 . The distance between the deflector 2 and the wall surface where the gas inlet 1 of the fixed bed reactor is located is 100 mm to 400 mm. The deflector 2 is a conical deflector, the number of the first annular slits dist...

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Abstract

The invention discloses a fixed bed reactor and a method for preparing maleic anhydride by virtue of normal butane oxidation. A gas inlet is formed at one end of a reactor body; a gas pre-distributer is arranged in one end of the reactor body and is connected with the gas inlet; a discharge port is arranged at the other end of the reactor body; a heat-transfer medium molten salt outlet and a heat-transfer medium molten salt inlet are formed on the side wall of the reactor body; a plurality of catalyst filling pipes are arranged in the reactor body; gas distributing plates are arranged at both ends of the plurality of catalyst filling pipes respectively, wherein a second homogenizing space is arranged between one gas distributing plate and the gas inlet while a first homogenizing space is arranged between the other gas distributing plate and the discharge port; the molten salt as a heat-transfer medium is arranged among the plurality of catalyst filling pipes; and a fluid director is connected with the inner wall of one end of the reactor body through a support rod. The fixed bed reactor provided by the invention has the advantages that the dimension of a region with a low gas velocity is reduced; and the influence of an uneven local impact on the distributing plates is decreased, so that the operation stability is improved. Therefore, the fixed bed reactor can be applied to the industrial production of 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] The fixed bed process is still the most mature technology and the most widely used process. As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/06C07D307/60
Inventor 蒋斌波陈楠杨遥王靖岱黄正梁廖祖维阳永荣郑海俊王宇良
Owner ZHEJIANG UNIV