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Method for producing benzoic acid by degrading waste plastic of polystyrene through catalysis in liquid phase

A waste plastic and polystyrene technology, applied in chemical instruments and methods, plastic recycling, preparation of organic compounds, etc., can solve the problems of polystyrene waste plastic pollution and other problems, achieve fast reaction rate, mild reaction conditions, and yield high effect

Inactive Publication Date: 2005-01-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method for the production of benzoic acid of the liquid-phase catalytic degradation polystyrene waste plastics of high degradation rate, degradation condition gentleness, high selectivity, apply this method not only can solve the pollution problem of polystyrene waste plastics, And it can also turn waste into treasure to produce benzoic acid products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The liquid-solid reaction mixture was added to a 500 ml titanium high-pressure reactor, and nitrogen gas was introduced as a protective gas. While stirring, the reaction mixture was heated to 190° C., and the pressure was increased to 2.0 MPa. The composition of the liquid-solid reaction mixture is 300 g acetic acid, 10.4 g polystyrene solid and 3.75 g catalyst. The composition of the added catalyst is: 0.76 g cobalt acetate tetrahydrate, 0.76 g manganese acetate tetrahydrate and 2.23 g hydrogen bromide (47% concentration aqueous solution). The degradation reaction was carried out at a temperature of 190°C and a pressure of 2.0 MPa. During the reaction, high-pressure air was continuously fed with a constant air flow rate of 8 L / min. The reaction is finished after 120 minutes, and the reaction liquid sample is analyzed by capillary gas chromatography to determine the composition of the oxidative degradation of small molecule products. The instrument used is Shimadzu GC-9A ga...

Embodiment 2

[0023] The oxidative degradation reaction of polystyrene was carried out in the same manner as in Example 1, except that the solvent system used in Example 2 was a mixture of acetic acid and water, and the solvent composition was 276 g of acetic acid and 24 g of water. The reaction was terminated after 120 minutes of degradation. Capillary gas chromatography was used to determine the amount of oxidative degradation products such as benzoic acid and diphenylethylenedione. The results are shown in Table 1.

Embodiment 3

[0025] The oxidative degradation reaction of polystyrene was performed in the same manner as in Example 1, except that the solvent system used in Example 3 was a mixture of acetic acid and benzene, and the solvent composition was 270 g of acetic acid and 30 g of benzene. The reaction was terminated after 120 minutes of degradation. Capillary gas chromatography was used to determine the amount of oxidative degradation products such as benzoic acid and diphenylethylenedione. The results are shown in Table 1 and Table 2.

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PUM

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Abstract

In this invention method, waste polystyrene is used as raw material, using soluble cobalt salt, manganic salt and bromide as catalysts, and using inert solvent. They are proportionally mixed under temp. of 100 to 350 deg.C, and pressure of 0.4 to 4.0 MPa. Oxygen-contained gas is used for oxidizing and degrading waste polystyrene to produce benzoic acid. Advantages are: mild reaction condition, high reaction rate, high yield, good economic and social benefits.

Description

Technical field [0001] The invention discloses a method for producing benzoic acid by catalytically degrading polystyrene waste plastic in a liquid phase. Background technique [0002] Polystyrene (PS) materials and expanded polystyrene (EPS) materials have many excellent properties, so they are widely used in the manufacturing and packaging of various products, such as instruments, home appliances, fast food industry and supermarkets. However, after these polystyrene waste products or disposable products become garbage, they are highly chemically inert and are not easily decomposed by microorganisms, thus forming "white pollution" that poses a serious threat to the ecological environment. So far, there are many main methods to deal with waste PS, including landfill, incineration, recycling and degradation. [0003] The use of liquid-phase catalytic air oxidation technology to degrade waste polystyrene is a completely new process. In fact, under the irradiation of ultravio...

Claims

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Application Information

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IPC IPC(8): C07C51/00C07C51/265C07C63/06
CPCY02W30/62
Inventor 成有为李希
Owner ZHEJIANG UNIV
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