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Method for producing acetic acid by liquid phase catalytic degradation of waste polypropylene plastic

A waste polypropylene and liquid-phase catalysis technology, which is applied in the field of liquid-phase catalytic degradation of waste polypropylene plastics to produce acetic acid, can solve the problems of white pollution, difficult microbial decomposition, and threats to the ecological environment, achieving low degradation costs, fast reaction rates, Improves the effect of oxidative degradation processes

Inactive Publication Date: 2008-10-08
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after these polypropylene waste products or disposable products become garbage, they are not easy to be decomposed by microorganisms because of their high chemical inertness, thus forming "white pollution" that poses a serious threat to the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add the liquid-solid reaction mixture into a titanium autoclave with a volume of 500 ml, pass nitrogen gas as a protective gas, and heat the reaction mixture to 190° C. and pressure to 2.0 MPa while stirring. The liquid-solid reaction mixture consisted of 300 g acetic acid, 10.4 g polypropylene solids and 3.75 g catalyst. The added catalyst consisted of: 0.76 g of cobalt acetate tetrahydrate, 0.76 g of manganese acetate tetrahydrate and 2.23 g of hydrogen bromide (47% strength aqueous solution). The degradation reaction was carried out at a temperature of 190°C and a pressure of 2.0 MPa. During the reaction process, high-pressure air was continuously introduced, and the constant air flow rate was 8 L / min. After 120 minutes, the reaction was terminated, and the reaction liquid sample was analyzed by capillary gas chromatography to determine the composition of its oxidative degradation small molecule product. The instrument used is Shimadzu GC-9A gas chromatograph equipp...

Embodiment 2

[0021] The oxidative degradation reaction of polypropylene 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 276g of acetic acid and 24g of water. After 120 minutes of degradation, the reaction was finished, and the generation amount of acetic acid product could be measured by capillary gas chromatography. The results are shown in Table 1.

[0022] Table 1 The degradation reaction results under different solvent system composition conditions

[0023]

example

Solvent composition Acetic acid: water: benzene (g: g:

g)

temperature(℃)

Acetic acid yield

(%)

1

300∶0∶0

190

95

2

276∶24∶0

190

98

[0024] * The acetic acid yield (%) refers to the percentage of the actual acetic acid production amount to the theoretical production amount of acetic aci...

Embodiment 3

[0027] The oxidative degradation reaction of polypropylene was carried out in the same manner as in Example 1, except that the degradation temperature and pressure conditions used in Example 3 were different. The degradation temperature used in Example 3 was 160° C. and the pressure was 1.0 MPa. Finish reaction after degrading 120 minutes, can measure acetic acid with capillary gas chromatography, the results are shown in Table 2.

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PUM

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Abstract

The invention discloses a method to produce acetic acid from waste polypropylene plastic through liquid-phase catalytic degradation. The method takes soluble cobalt salt, manganic salt, zirconium salt, cerium salt, bromide and organic base as activator(zirconium salt and cerium salt are used as catalyst accelerator) and mixes the activator with waste polypropylene plastic and inert solvent proportionally; then the waste polypropylene is oxidized and degraded by oxygen-containing gas to produce acetic acid under 100-350 DEG C and 0.4-.0 MPa. The reaction mother solution in the method can be recycled to the system for repeated use. The reaction is of mild condition, fast speed and high conversion rate; the method not only solves the social problem of white pollution, but also produces acetic acid which is a kind of fine chemical material to get more economic benefits; the degradation cost is low and the degraded products are of high added value.

Description

technical field [0001] The invention discloses a method for producing acetic acid by liquid-phase catalytic degradation of waste polypropylene plastics. Background technique [0002] Polypropylene plastic (PP) material has many excellent properties, so it is widely used in the manufacture and packaging of various products, such as instruments, home appliances, fast food and supermarkets. However, after these polypropylene waste products or disposable products become garbage, they are not easy to be decomposed by microorganisms because of their high chemical inertness, thus forming "white pollution" that poses a serious threat to the ecological environment. So far, there have been many main methods to deal with waste PP, mainly including landfill method, incineration method, recycling method and other methods. [0003] It is a brand new process to degrade waste polypropylene by liquid-phase catalytic air oxidation technology. In fact, under the irradiation of ultraviolet ra...

Claims

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Application Information

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IPC IPC(8): C07C53/08C07C51/16
Inventor 牛俊峰尤玉如李武曾翎
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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