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Gas distributor in fluidized bed of aniline synthesis and aniline synthesis method

A technology of gas distributor and synthesis method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as unavoidable large temperature rise, affecting the purity of aniline products, and carbon deposition activity of catalysts, and achieves Good gas-solid contact effect, guaranteed gas-solid contact effect, and reduced impact

Active Publication Date: 2008-05-28
SINOPEC NANJING CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, many impurities will be generated, which will affect the purity of the aniline product, and cause the catalyst to deposit carbon and reduce its activity.
And these distributor forms currently used cannot avoid the phenomenon of large temperature rise caused by bad operation from the structure

Method used

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  • Gas distributor in fluidized bed of aniline synthesis and aniline synthesis method
  • Gas distributor in fluidized bed of aniline synthesis and aniline synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] in such as figure 2 The reaction is carried out in the fluidized bed apparatus shown for the preparation of aniline by gas-phase hydrogenation of nitrobenzene. Set an annular pipeline for distributing gas, whose diameter is 90% of the diameter of the main air pipe; control the ratio of the number of upward nozzles on the distributor to the number of downward nozzles to be 1:1, and the installation distance between the outlet of the downward nozzle and the outlet of the upward nozzle is 200mm. The gas velocity in the main intake pipe is 5m / s, and the gas velocity at the nozzle outlet is 100m / s. The feed is hydrogen and nitrobenzene, the molar ratio is 20:1; the operating pressure (absolute pressure) is 0.25MPa; the catalyst (Cu-SiO 2 ) The average temperature in the dense-phase zone is 260°C, the average temperature in the gas distributor zone is 265°C; the weight space velocity is 0.2 hours, and the actual gas velocity in the catalyst dense-phase zone is 0.1m / s. In ...

Embodiment 2

[0036] in such as figure 2 The reaction is carried out in the fluidized bed apparatus shown for the preparation of aniline by gas-phase hydrogenation of nitrobenzene. Set up three annular pipes for distributing gas, the diameters of which are 20%, 40%, and 60% of the diameter of the main air pipe respectively; The installation distance from the upward nozzle outlet is 500mm. The gas velocity in the main intake pipe is 20m / s, and the gas velocity at the nozzle outlet is 150m / s. Feed is hydrogen and nitrobenzene, and molar ratio is 7: 1; Operating pressure (absolute pressure) is 0.1MPa; Catalyst (Cu-Al 2 o 3 ) The average temperature of the dense phase area is 255°C, the average temperature of the gas distributor area is 270°C; the weight space velocity is 0.1 hour -1 , the actual gas velocity in the catalyst dense phase zone is 0.9m / s. Within two months, the content of nitrobenzene in crude aniline was 4.5 mg / kg, and the content of cyclohexanol and cyclohexylamine were 20...

Embodiment 3

[0038] in such as figure 2 The reaction is carried out in the fluidized bed apparatus shown for the preparation of aniline by gas-phase hydrogenation of nitrobenzene. Set four annular pipes for distributing gas, whose diameters are 10, 20%, 50%, and 80% of the diameter of the main air pipe; the ratio of the number of upward nozzles on the distributor to the number of downward nozzles is 1:3, and the The installation distance between the nozzle outlet and the upward nozzle outlet is 1000mm. The gas velocity in the main intake pipe is 15m / s, and the gas velocity at the nozzle outlet is 60m / s. The feed is hydrogen and nitrobenzene, and the molar ratio is 12:1; the operating pressure (absolute pressure) is 1.0 MPa; the average temperature of the catalyst dense phase zone is 250 ° C, and the average temperature of the gas distributor area is 256 ° C; Speed ​​is 0.23 hours -1 , catalyst (Cu-Al 2 o 3 ) The actual gas velocity in the dense phase region is 0.6m / s. The content of...

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Abstract

The invention discloses a gas distributor and a method for synthesizing aniline in fluidized bed, which belongs to the field of chemical equipment and chemical materials preparing technology. The gas distributor comprises main pipe for transporting gas, branched pipe and ring conduit connected with the same, and nozzle arranged on the ring conduit capable of spraying gas up and down. The invention also discloses a method for vapor hydrogenation preparation of aniline from nitrobenzene by using said equipment, characterized by controlling the quantity of nozzles to adjust the temperature of gas distributor zone for controlling the quality of aniline. The invention can reduce the maximum and average temperature of gas distributor zone, reduce the coking on the catalyst, prolong the using time of catalyst, and improve the purity of aniline.

Description

technical field [0001] The invention belongs to the technical scope of chemical equipment and chemical raw material preparation, and in particular relates to a gas distributor in an aniline synthesis fluidized bed for preparing aniline by gas-phase hydrogenation of nitrobenzene and an aniline synthesis method. Background technique [0002] Aniline is a very important class of chemical products. With the wide application of polyurethane in the fields of construction, automobiles, electrical appliances and packaging materials, the output of methyl diisocyanate (MDI for short), the main raw material of polyurethane, prepared from aniline has increased rapidly, resulting in a substantial increase in the consumption of aniline. . At present, aniline is mainly used in the production of MDI and rubber additives, and can also be used in the fields of pesticides, organic pigments and pharmaceuticals. The world's annual demand is about 3 million tons. [0003] At present, there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/46C07C209/36
Inventor 骞伟中潘正中魏飞张伟王垚董安城丁玉梅
Owner SINOPEC NANJING CHEM IND CO LTD
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