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Catalyst for reduction of aromatic nitro-compounds by hydrazine hydrate and preparation method thereof

A technology of aromatic nitro group and hydrazine hydrate, applied in the chemical industry, can solve problems such as poor activity and difficult regeneration, and achieve the effects of convenient preparation, resource saving and production cost reduction

Inactive Publication Date: 2011-01-12
JIANGSU EQUALCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the literature, people have problems with catalysts in their research, mainly in the use of precious metals, poor activity, difficult regeneration, and many other problems in large-scale industrial production.

Method used

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  • Catalyst for reduction of aromatic nitro-compounds by hydrazine hydrate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A catalyst for reducing aromatic nitro compounds with hydrazine hydrate, which comprises the following components in mass percent: 10% of iron, 30% of iron oxide, 35% of ferric oxide and 25% of water.

[0029] The preparation method of the above-mentioned catalyst for reducing aromatic nitro compounds with hydrazine hydrate comprises the following steps:

[0030] (1) In the reactor, add 60ml of water and 20 grams of iron with a content of 93% and a mesh size of 40-60 mesh iron powder, start stirring, and slowly heat up to 80°C;

[0031] (2) heating and reflux reaction at 85°C for 3 hours, and adjusting the pH of the system with hydrochloric acid during the reflux process to be 3-5;

[0032] (3) After the reflux is finished, heat filter, wash with 20ml hot water until neutral, and drain to obtain 30 grams of the catalyst for reducing aromatic nitro compounds with hydrazine hydrate.

[0033] The application process of the catalyst in the reduction of aromatic nitro compo...

Embodiment 2

[0035] A catalyst for reducing aromatic nitro compounds with hydrazine hydrate, which comprises the following components in mass percent: 13% of iron, 33% of iron oxide, 37% of ferric oxide and 17% of water.

[0036] The preparation method of the above-mentioned catalyst for reducing aromatic nitro compounds with hydrazine hydrate comprises the following steps:

[0037] (1) In the reactor, add 60ml of water and 20 grams of iron with a content of 93% and a mesh size of 40-60 mesh iron powder, start stirring, and slowly heat up to 90°C;

[0038] (2) heating and reflux reaction at 90°C for 4 hours, and adjusting the pH of the system with sulfuric acid during the reflux process to be 3-5;

[0039] (3) After the reflux is finished, heat filter, wash with 20ml hot water until neutral, and drain to obtain 30.2 grams of the catalyst for reducing aromatic nitro compounds with hydrazine hydrate.

[0040] The application process of the catalyst in the reduction of aromatic nitro compoun...

Embodiment 3

[0042] A catalyst for reducing aromatic nitro compounds with hydrazine hydrate, which comprises the following components in mass percent: 15% iron, 35% iron oxide, 40% ferric oxide and 10% water.

[0043] The preparation method of the above-mentioned catalyst for reducing aromatic nitro compounds with hydrazine hydrate comprises the following steps:

[0044] (1) In the reactor, add 60ml of water and 20 grams of iron, the content of which is 93% and the mesh size is 40-60 mesh iron powder, start stirring, and slowly heat up to 100°C;

[0045] (2) Heating and reflux reaction at 95° C. for 6 hours, and adjusting the pH of the system with acetic acid during the reflux process to be 3-5;

[0046] (3) After the reflux is completed, heat filter, wash with 20ml hot water until neutral, and drain to obtain 30.1 g of the catalyst for reducing aromatic nitro compounds with hydrazine hydrate.

[0047] The application process of the catalyst in the reduction of aromatic nitro compounds wi...

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Abstract

The invention discloses a catalyst for the reduction of aromatic nitro-compounds by hydrazine hydrate. The catalyst comprises the following components in percentage by weight: 10 to 15 percent of iron, 30 to 35 percent of ferrous oxide, 35 to 40 percent of ferric oxide, and 10 to 25 percent of water. The invention further discloses a preparation method of the catalyst. The method comprises the following steps of: reacting the iron serving as a raw material with water at a certain temperature when the pH value is 3 to 5; and obtaining the catalyst for the reduction of the aromatic nitro-compounds by hydrazine hydrate by separation. The invention also discloses application of the catalyst to reduction of the aromatic nitro-compounds by the hydrazine hydrate. The catalyst has the advantages that: the preparation process of the catalyst is convenient; and when used in the reduction of the aromatic nitro-compounds by hydrazine hydrate, the catalyst is prevented from being inactivated and can be used repeatedly without limit. The method overcomes the problems of regeneration and inactivation of normal catalysts and provides a permanent catalyst for the industrial reduction of the aromatic nitro-compounds by hydrazine hydrate.

Description

technical field [0001] The invention relates to a catalyst in the field of chemical industry and its preparation method and application, in particular to a catalyst for reducing aromatic nitro compounds with hydrazine hydrate and its preparation method. Background technique [0002] The reduction of aromatic nitro compounds to aromatic amino compounds is a common chemical reaction method. The reduction methods include iron powder reduction method, alkali sulfide reduction method, hydrogenation catalytic reduction method, hydrazine hydrate catalytic reduction method, etc. The iron powder reduction method is due to the Too much solid waste is listed as an eliminated process by the country; the alkali sulfide reduction method is not used for clean production due to the large amount of waste water, complicated treatment process, and great environmental hazards; the hydrogenation catalytic reduction method is currently ideal Reduction process, but this process requires the use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C07B43/04C07C213/02C07C217/90
CPCY02P20/584
Inventor 易江华阮文林毕亚铃章传力
Owner JIANGSU EQUALCHEM
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