Method for preparing p-nitrobenzoic acid through polystyrene foam

A technology of polystyrene foam and p-nitrobenzoic acid, applied in chemical instruments and methods, preparation of nitro compounds, preparation of organic compounds, etc., can solve the problems of environmental pollution, high cost of raw materials, corrosion of equipment, etc., and achieve purity High efficiency, easy operation, and the effect of reducing raw material costs

Inactive Publication Date: 2016-10-12
诚和环境科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to provide a method for preparing p-nitrobenzoic acid by using polystyrene foam, which can solve the problems of corrosion equipment, environmental pollution and high cost of raw materials in the existing preparation of p-nitrobenzoic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Defoaming treatment: Wash and dry the waste polystyrene foam, referred to as small pieces, and then add it to a heat defoamer, and defoam at 60-80°C for 1-3 hours to reduce the foam volume to its original size. 1 / 30, take out and crush;

[0021] (2) Microwave digestion: Add the polystyrene foam after the defoaming treatment in step (1) into the microwave digestion apparatus, and at the same time add a nitric acid solution with a mass concentration of 60-65% that is 1 to 2 times the mass of the polystyrene foam , under the conditions of 220-250°C and 20-25MPa, carry out microwave digestion treatment for 3-5min;

[0022] (3) Catalytic oxidation: press filter the mixture after microwave digestion in step (2), take the filtrate and put it into the reaction kettle, then add the catalyst solution which accounts for 2 to 5 times the volume of the filtrate, mix well, and pour into Oxygen until the pressure in the reactor reaches 1~2MPa, and finally react in a constant temp...

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PUM

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Abstract

The invention discloses a method for preparing p-nitrobenzoic acid by using polystyrene foam, which comprises the following steps: (1) defoaming treatment; (2) microwave digestion; (3) catalytic oxidation; (4) product separation and purification. The present invention utilizes polystyrene foam to prepare the method for p-nitrobenzoic acid, which is simple and convenient to operate and easy to realize. It takes waste polystyrene foam as raw material and utilizes the method of nitric acid digestion and oxygen oxidation to turn waste into wealth on the one hand, The cost of raw materials is reduced, and on the other hand, the problem of severe corrosion caused by the direct use of nitric acid oxidation is effectively solved, and the product has high purity, high yield, and easy separation and treatment of the product.

Description

technical field [0001] The invention relates to the field of chemical products, in particular to a method for preparing p-nitrobenzoic acid by utilizing polystyrene foam. Background technique [0002] p-Nitrobenzoic acid is an important pharmaceutical intermediate and raw material for organic synthesis, which can be used in the production of procaine hydrochloride, procainamine hydrochloride, folic acid, benzocaine, tranexamic acid and other important pharmaceuticals Raw materials are also important intermediates for the production of pesticides, dyes and other chemical products, and are in great demand in industry. The traditional p-nitrobenzoic acid uses high-priced metal salts to oxidize p-nitrotoluene, which is banned due to high cost, serious corrosion of equipment and large amount of industrial waste. Existing method adopts nitric acid oxidation and liquid-phase catalytic air oxidation method, and the cost of the former is low, postpartum treatment is simple, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/08C07C201/12C07C205/57C07C205/06
CPCC07C201/08C07C201/12C07C205/57C07C205/06
Inventor 孙云
Owner 诚和环境科技(苏州)有限公司
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