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Method for preparing nitrobenzene from benzene

A technology of nitrobenzene and nitration reaction, applied in the preparation of nitro compounds, organic chemistry, etc., can solve the problems of high equipment requirements, high energy consumption for product separation, and large amount of nitric acid, so as to simplify the process and equipment and improve resources Utilization rate, effect of product cost reduction

Active Publication Date: 2017-02-22
XIANGTAN UNIV
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Problems solved by technology

The above-mentioned processes are gas-phase nitrification, which requires high equipment, and the catalyst production process is cumbersome and easy to deactivate
[0010] In the existing nitric acid method, the amount of nitric acid is very large, the stability of the catalyst in such an aqueous system is poor, and there is a lot of waste acid waste water produced, and the separation of products consumes a lot of energy

Method used

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  • Method for preparing nitrobenzene from benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: take by weighing 2.5g benzene and 7.37gNO 2 (the molar ratio is 1:5) is placed in a 100ml sealable tank reactor (i.e. a high-pressure reactor made of stainless steel), the reaction pressure is 0.15 MPa, after reacting at 90°C for 6h, cooling, the reaction product is carried out The internal standard analysis by gas chromatography showed that the conversion rate of benzene was 37.1%, and the selectivity of nitrobenzene was 90.4%.

Embodiment 2

[0057] Embodiment 2: The reaction steps are the same as in Example 1, the difference is that in the reactor, add 0.2g HPW / MCM-41 catalyst (prepared by impregnation method, the loading capacity of phosphotungstic acid HPW is 30%, and the activation roasting temperature is 400°C, the activation time is 3h), the conversion rate of benzene is 58.7%, and the selectivity of mononitrobenzene is 98.2%.

Embodiment 3

[0058] Embodiment 3: The reaction steps are the same as in Example 1, the difference is that the nitrating agent is N 2 o 3 , the conversion rate of benzene obtained was 27.5%, and the selectivity of nitrobenzene was 89.2%.

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Abstract

Disclosed is a method for preparing nitrobenzene by using nitrogen oxide (NOx) nitrobenzene. The preparing method comprises the steps of transferring a method of 'strong acid' to a method of 'non-acid' to replace 'nitric acid / sulfuric acid' environment, adopting the NOx as a nitrating agent, adopting a sold acid with high stability and high activity as a catalyst, conducting a high atom economy green technology, conducting nitration reaction on benzene and preparing the nitrobenzene in high selectivity. Compared with the prior art, the method can sharply simplify a craft process and equipment and reduce waste production; meanwhile, the method is environmentally friendly, and can reduce production cost and increase resource utilization rate.

Description

technical field [0001] The invention relates to a method for preparing nitrobenzene with high selectivity, that is, a nitrogen oxide (NO x ) A green method for preparing nitrobenzene with high selectivity from nitrobenzene. Background technique [0002] Nitroaromatic compounds are important organic synthesis intermediates, important raw materials for the production of medicines, pesticides, spices and dyes, and catalytic hydrogenation reduction of corresponding nitroaromatic compounds is a common industrial method for the synthesis of aromatic amines. Therefore, aromatic compounds As an important organic reaction, the nitrification reaction of nitrification has been extensively studied. [0003] Nitrobenzene (NB) is an extremely important organic chemical intermediate, which can be used in the synthesis of medicines, dyes, pesticides, explosives, rubber additives, etc. It is mainly used to produce aniline, and then to produce various useful organic intermediates. It is use...

Claims

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Application Information

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IPC IPC(8): C07C201/08C07C205/06
Inventor 游奎一邓人杰蹇建罗和安刘平乐艾秋红
Owner XIANGTAN UNIV
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