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Method for producing para-aminobenzoic acid with waste and old polystyrene

A technology for waste polystyrene and p-aminobenzoic acid, which is applied in chemical instruments and methods, cyanide reaction preparation, organic compound preparation and other directions, can solve problems such as destroying ecological balance and environmental pollution, and achieves reduction and avoidance of by-products. Multi-step operation, the effect of good application prospects

Inactive Publication Date: 2009-04-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since waste polystyrene does not degrade in the natural environment, it causes environmental pollution and destroys the ecological balance

Method used

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  • Method for producing para-aminobenzoic acid with waste and old polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After thermal defoaming treatment of ordinary waste polystyrene, use a pulverizer to pulverize to obtain polystyrene powder, add 2g of the above-mentioned powder to the reaction bottle of the microwave reactor, add nitric acid according to 9.5 times the mass of polystyrene, and press polystyrene Add zinc nitrate to 1% of the mass of ethylene, and then put it into a magnetic rotor to mix and react. Set the reaction time of the microwave reactor to 60min, set the reaction temperature to 200°C, set the reaction pressure to 2.0MPa, and the reaction power to 1200W . After the reaction is over, pour it into a beaker while it is hot, and cool to room temperature to precipitate p-nitrobenzoic acid. After filtering with a sand core funnel, wash with distilled water to remove residual acid and then filter to obtain 2.604 g of p-nitrobenzoic acid. Get 1g p-nitrobenzoic acid and be dissolved in sodium hydroxide solution (mass percentage composition of sodium hydroxide is 10%), be ...

Embodiment 2

[0033] After the ordinary waste polystyrene organic solvent is defoamed, use a pulverizer to pulverize to obtain polystyrene powder, add 10g of the above-mentioned powder to the reaction bottle of the microwave reactor, add nitric acid by 10 times the mass of polystyrene, and press polystyrene Add zinc nitrate to 1% of the mass of styrene, and then put it into a magnetic rotor to mix and react. The reaction time of the microwave reactor is set to 80min, the reaction temperature is set to 190°C, the reaction pressure is set to 2.1MPa, and the reaction power is 1800W. After the reaction is over, pour it into a beaker while it is hot, and cool to room temperature to precipitate p-nitrobenzoic acid. After filtering with a sand core funnel, wash with distilled water to remove residual acid and then filter to obtain 13.752 g of p-nitrobenzoic acid. Get 1g p-nitrobenzoic acid and be dissolved in potassium hydroxide solution (the mass percentage composition of potassium hydroxide is ...

Embodiment 3

[0035]After thermal defoaming treatment of ordinary waste polystyrene, use a pulverizer to pulverize to obtain polystyrene powder, add 5g of the above-mentioned powder to the reaction bottle of the microwave reactor, add nitric acid in a mass ratio of 5:1 according to the mass of polystyrene, Add nickel nitrate according to 0.1% of the mass of polystyrene, and then put it into the magnetic rotor for mixing and then react. The power is 5000W. After the reaction is over, pour it into a beaker while it is hot, and cool to room temperature to precipitate p-nitrobenzoic acid. After filtering with a sand core funnel, wash with distilled water to remove residual acid and then filter to obtain 6.55 g of p-nitrobenzoic acid. Get 1g p-nitrobenzoic acid and be dissolved in potassium hydroxide solution (the mass percentage composition of potassium hydroxide is 20%), be mixed with the p-nitrobenzoic acid solution that mass percentage composition is 20%, put into microwave reactor In the ...

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Abstract

The invention provides a method for preparing p-aminobenzoic acid by waste polystyrene. The method comprises the following steps: putting the waste polystyrene crushed simply into a microwave reactor, adding a nitrifying oxidant and a catalyst I, reacting in microwave, and then cooling the reaction liquid to room temperature, separating out p-nitrobenzene formic acid, and filtering the acid after washing the acid; dissolving the p-nitrobenzene formic acid in an alkali liquor, and putting the microwave reactor again, adding a catalyst II, and introducing hydrogen; and after reacting in microwave, cleaning, crystallizing and drying, obtaining the p-aminobenzoic acid. The method changes the waste polystyrene into valuable for raw materials, and overcomes the defects of multi-step operation of the prior method, low yield and low purity. The method improves the purity and the yield of the p-aminobenzoic acid prepared by a microwave method remarkably compared with the prior method, has high production efficiency, and has excellent application prospect in industry.

Description

technical field [0001] The invention relates to a method for preparing organic acid, in particular to a method for preparing p-aminobenzoic acid from waste polystyrene. Background technique [0002] Para-aminobenzoic acid (PABA) is a yellow crystalline compound that is soluble in water, ethanol and ether. PABA is an important raw material for organic synthesis, especially as a pharmaceutical intermediate. It is an important intermediate in the synthesis of non-steroidal anti-inflammatory drug felbinac. Felbinac has strong anti-inflammatory and analgesic effects and good transdermal properties, and has the characteristics of quick action, high efficiency and safety for the treatment of joint diseases and muscle pain. In addition, such as synthetic blood tonic folic acid (vitamin B C ), procoagulant drugs-p-carboxybenzylamine, various esters of p-aminobenzoic acid and its derivatives are widely used anesthetics, which can relieve several types of anemia, viral anemia, and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/56C07C227/18
Inventor 韦萍王浩绮阮文辉曹飞周治倪芳
Owner NANJING UNIV OF TECH
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