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 a

Method used

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  • Method for preparing nitrobenzene from benzene

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0056] Example 1: Weigh 2.5g benzene and 7.37gNO 2 (The molar ratio is 1:5) is placed in a 100ml sealable tank reactor (that is, an autoclave made of stainless steel), the reaction pressure is 0.15 MPa, and after reacting at 90°C for 6 hours, it is cooled and the reaction product proceeds Gas chromatography internal standard analysis showed that the conversion rate of benzene was 37.1%, and the selectivity of nitrobenzene was 90.4%.

Example Embodiment

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

Example Embodiment

[0058] Example 3: The reaction steps are the same as in Example 1, except that the nitrating agent is N 2 O 3 The conversion rate of benzene 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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