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Catalyst for synthesizing m-phenylenediamine from m-dinitrobenzene by hydrogenation reaction and application thereof

A technology for m-dinitrobenzene and m-phenylenediamine, which is applied in the field of catalysis and achieves the effects of simple preparation process, improved selectivity and high activity

Inactive Publication Date: 2014-03-19
王善良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst with core-shell structure is a type of catalyst that has been developed in recent years. It has a unique structure. Due to its high conversion rate and selectivity in the reaction, it greatly improves the service life and stability of the catalyst. And widely concerned, and its application in m-dinitrobenzene hydrogenation has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of catalyst 1

[0020] (1) First prepare the inner core of the catalyst, add platinum dichloride, silver nitrate and zinc chloride into 1000ml pure water according to the molar ratio, fully stir and mix uniformly, and form the active component slurry A, wherein the first component and the second The molar ratio of the elements of the components is 1:3;

[0021] (2) Co-precipitating the active component slurry A to form the inner core slurry of the catalyst, drying at 70° C., molding, and roasting at 300° C. for 8 hours to obtain the inner core of the catalyst;

[0022] (3) Then prepare the outer layer of the catalyst, then add lead nitrate, silver nitrate, zinc chloride and lanthanum chloride into 1000ml pure water according to the molar ratio, fully stir and mix to form the active component slurry B, wherein the first group The element molar ratio of the second component and the third component is 1:3:3;

[0023] (4) Finally, the prepare...

Embodiment 2

[0025] Embodiment 2: the preparation of catalyst 2

[0026] (1) First prepare the inner core of the catalyst, add platinum nitrate, palladium sulfate and copper chloride into 1000ml pure water according to the molar ratio, fully stir and mix to form the active component slurry A, wherein the first component and the second component The molar ratio of the elements is 1:5;

[0027] (2) Co-precipitating the active component slurry A to form the inner core slurry of the catalyst, drying at 70° C., molding, and roasting at 300° C. for 8 hours to obtain the inner core of the catalyst;

[0028] (3) Then prepare the outer layer of the catalyst, then add platinum nitrate, palladium sulfate, copper chloride and lanthanum chloride into 1000ml pure water according to the molar ratio, fully stir and mix uniformly, and form the active component slurry B, wherein the first group The elemental molar ratio of the second component and the third component is 1:5:3;

[0029] (4) Finally, the pr...

Embodiment 3

[0037] Example 3: The performance measurement of using the above-mentioned catalyst in the reaction of methanol dehydration to prepare dimethyl ether. Using a fixed bed reactor, the reaction temperature is 200°C, the pressure is 1Mpa, the weight hourly space velocity is 5h-1, and industrial sewage ethanol is used as the reaction raw material to investigate the performance of the above catalyst in the reaction of methanol to dimethyl ether. The results are listed below Table 1 and Table 2.

[0038] The reaction performance of table 1 catalyst

[0039] Application example

[0040] The stability of table 2 catalyst 1

[0041] operation hours

[0042] (h)

[0043] As can be seen from the above results, compared with the prior art, the reaction performance and stability of the catalyst prepared by the present invention have been greatly improved. After 400 hours of continuous reaction, the activity of the catalyst is still very high without significa...

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Abstract

The invention provides a catalyst for synthesizing m-phenylenediamine from m-dinitrobenzene by hydrogenation reaction, wherein the catalyst comprises a core structure and a shell structure, the core structure is a MnO2-NiO-ZrO2 composite metal oxide, and the shell structure is MnO2-NiO-ZrO2-SiO2-TiO2. The catalyst with a core-shell structure has advantages of simple preparation technology and low cost, a special structure and mutual effects of Mn, Ni and Zr greatly raise the activity of the catalyst, and the conversion rate of m-dinitrobenzene and the yield of the m-phenylenediamine are all higher than 97%.

Description

technical field [0001] The invention relates to a catalyst for synthesizing m-phenylenediamine by hydrogenation of m-dinitrobenzene and an application thereof, belonging to the technical field of catalysis. Background technique [0002] M-phenylenediamine is an important organic chemical raw material, widely used as an intermediate of azo dyes, fur dyes, reactive dyes and sulfur dyes in the dye industry; in addition, it is also used in mordants, hair dyes, visual [0003] Synthesis of colorants, rubber compounding agents, epoxy resin curing agents, petroleum additives, cement coagulants and metal dissolvers. The industrial production of m-phenylenediamine basically adopts the reduction method of m-dinitrobenzene iron powder. This method has a long history, simple process, and mature technology, but the production cost is high, the yield is low, and a large amount of iron sludge and waste water containing aromatic amines that are difficult to handle are produced, causing ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C211/51C07C209/36B01J35/02
Inventor 王红果李继明
Owner 王善良
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