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Catalyst for nitroaniline and preparation method thereof

A technology of nitroaniline and catalyst, applied in the field of catalyst of nitroaniline and preparation thereof, can solve the problem of low utilization rate of palladium-carbon catalyst, and achieve the effects of improving connection stability, reducing retention and preventing clogging of raw materials

Active Publication Date: 2021-04-20
浙江工业大学上虞研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention solves the problem that the utilization rate of the existing palladium-carbon catalyst is not high, and uses porous activated carbon hollow spheres as the carrier to form a filter-type fixed-bed reaction system, reducing the retention of raw materials , to prevent raw material clogging, and to ensure a large area of ​​active palladium exposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]A catalyst for nitroenylamine, with porous active carbon hollow balls as a carrier, forms a hollow spherical PD / C catalyst in the active point of palladium as a film.

[0022]The preparation method of the porous active carbon hollow ball includes the following steps:

[0023]Step 1, 50 g of ethylcellulose is added to anhydrous ethanol to stir well and uniformly form a viscous fluid, then put into the mold in the mold to form a microspheres of the microspheres forming 2 mm; the moietic ratio of the ethyl cellulose and anhydrous ethanol is 4 : 1, the stirring speed is 1000 r / min, the temperature of the temperature is 90 ° C, the pressure is 0.3 MPa;

[0024]Step 2, the activated carbon is added to the 1L ethanol solution to stir well, slowly add ethylcellulose and methylcellulose, and disperse to dispebrace dispebidity, then the suspension dispersion is sprayed in microsphere surface, constant temperature The concentration of 2.7 mm coated microspheres is formed; the concentration of...

Embodiment 2

[0033]A catalyst for nitroenylamine, with porous active carbon hollow balls as a carrier, forms a hollow spherical PD / C catalyst in the active point of palladium as a film.

[0034]The preparation method of the porous active carbon hollow ball includes the following steps:

[0035]Step 1, 50 g of ethylcellulose is added to anhydrous ethanol to stir well and uniformly form a viscous liquid, then put the constant temperature suppression of the mold to form 3.8 mm microspheres; the mass ratio of the ethylcellulose and anhydrous ethanol is 2 : 1, the stirring speed is 2000 r / min, and the temperature of the constant temperature is 100 ° C, the pressure is 0.4 MPa;

[0036]Step 2, the activated carbon is added to the 1L ethanol solution to stir well, slowly add ethylcellulose and methylcellulose, and disperse to dispebrace dispebidity, then the suspension dispersion is sprayed in microsphere surface, constant temperature 5 mM coated microspheres; the concentration of the activated carbon in th...

Embodiment 3

[0045]A catalyst for nitroenylamine, with porous active carbon hollow balls as a carrier, forms a hollow spherical PD / C catalyst in the active point of palladium as a film.

[0046]The preparation method of the porous active carbon hollow ball includes the following steps:

[0047]Step 1, the ethyl cellulose is added to anhydrous ethanol to stir well and uniformly form a viscous liquid, and then put the constant temperature suppression of the mold to form 3 mm microspheres; the mass ratio of the ethylcellulose and anhydrous ethanol is 4: 1 The stirring speed is 1500 r / min, and the temperature of the constant temperature is 95 ° C, and the pressure is 0.4 MPa;

[0048]Step 2, the activated carbon is added to the 1L ethanol solution to stir well, slowly add ethylcellulose and methylcellulose, and disperse to dispebrace dispebidity, then the suspension dispersion is sprayed in microsphere surface, constant temperature Form 4.3mm coated microspheres; the concentration of the activated carbon...

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Abstract

The invention belongs to the field of nitroaniline, particularly relates to a catalyst for nitroaniline and a preparation method thereof. The hollow spherical Pd / C catalyst is formed by taking a porous activated carbon hollow sphere as a carrier and palladium as an active site of a membrane, and a preparation method and application of the hollow spherical Pd / C catalyst are provided. The problem of low utilization rate of the existing palladium-carbon catalyst is solved, the activated carbon hollow spheres with porous structures are used as carriers to form a filter type fixed bed reaction system, the retention of raw materials is reduced, the blockage of the raw materials is prevented, and the large-area exposure of the activated palladium is ensured.

Description

Technical field[0001]The present invention belongs to the field of nitroenylamine, and more particularly to a catalyst for nitropheniline and a preparation method thereof.Background technique[0002]Nitrophenylamine includes intrinsic synthetic chemicals widely used in the bimfly dye industry, mainly used as intermediates and pharmaceutical chemicals that are widely used as intermediates and pharmaceutical chemicals that are widely used in the combustion dye industry.[0003]The industrial use of nitrochlorobanine is used as raw material, and the nitrosamine is prepared directly under high pressure. The use of this process is highly selective, high product purity, but the process is low, and the process will produce a large amount of chlorine-containing waste, and the environment is not friendly. With the continuous development of catalytic hydrogenation reduction technology, more and more catalytic hydrogenation techniques are used in catalytic reductions of nitrobenzene compounds: (1)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/08C07C209/36C07C211/52
Inventor 方标许萌柯军梁
Owner 浙江工业大学上虞研究院有限公司