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Dechlorination method for chlorine-containing plastic

A dechlorination and plastic technology, applied in the chemical industry, can solve secondary pollution and other problems, and achieve the effect of no secondary pollution, considerable economic benefits, and high economic value

Active Publication Date: 2017-01-25
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen chloride obtained by pyrolytic dechlorination exists in the form of gas, which can easily diffuse into the environment and cause secondary pollution.

Method used

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  • Dechlorination method for chlorine-containing plastic
  • Dechlorination method for chlorine-containing plastic
  • Dechlorination method for chlorine-containing plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]After mixing ferric oxide and polyvinyl chloride (number average molecular weight: 6500) according to the molar ratio of ferric oxide and chlorine in polyvinyl chloride (1:2), place it in a closed reaction kettle under the protection of argon for 250 ℃ for 0.5 hour, and the pressure in the reaction kettle is 1 to 5 atmospheres during the reaction. After the reaction, the reactor was opened to reclaim the gaseous hydrocarbons, and an appropriate amount of solid phase substances were taken from the reaction liquid in the reactor for XRD analysis, and the results were as follows: figure 1 as shown, figure 1 It is the XRD figure of the solid phase material provided by Example 1 of the present invention. pass figure 1 It can be seen that after the pyrolysis reaction, most of the iron oxide has been converted into ferrous chloride, and some iron oxide remains unreacted.

[0036] In order to separate the chlorine salt in the reaction solution in the still, the reaction solut...

Embodiment 2

[0038] After mixing ferric oxide and polyvinyl chloride (number average molecular weight: 6500) according to the molar ratio of ferric oxide and chlorine in polyvinyl chloride (1:3), place it in a closed reaction kettle under the protection of argon for 250 ℃ for 0.5 hour, and the pressure in the reaction kettle is 1 to 5 atmospheres during the reaction. After the reaction, the reactor was opened to reclaim the gaseous hydrocarbons, and an appropriate amount of solid phase substances were taken from the reaction liquid in the reactor for XRD analysis, and the results were as follows: figure 2 as shown, figure 2 It is the XRD pattern of the solid phase substance provided by Example 2 of the present invention. pass figure 2 It can be seen that after the pyrolysis reaction, most of the ferric oxide has been converted into ferrous chloride, and some ferric oxide remains unreacted.

[0039] In order to separate the chlorine salt in the reaction solution in the still, the reac...

Embodiment 3

[0041] After mixing the mixture of hematite and 90wt% polyvinyl chloride (number average molecular weight: 6500) + 5wt% polyethylene + 5wt% polypropylene according to the molar ratio of ferric oxide and chlorine in polyvinyl chloride (1:2) , placed in a closed reactor at 377° C. for 0.5 hour reaction under argon protection, and the pressure in the reactor was 1 to 5 atmospheres during the reaction. After the reaction is over, the reactor is opened to recover gaseous hydrocarbons, and an appropriate amount of solid phase substances are taken from the reaction liquid in the reactor for XRD analysis, and the results are as follows: image 3 as shown, image 3 It is the XRD pattern of the solid phase material provided by Example 3 of the present invention. pass image 3 It can be seen that after the pyrolysis reaction, most of the iron oxide has been converted into ferrous chloride, and some iron oxide remains unreacted.

[0042] In order to separate the chlorine salt in the re...

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Abstract

The invention belongs to the field of chemical industry, and particularly relates to a dechlorination method for chlorine-containing plastic. The method comprises the following steps: a), performing a pyrolysis reaction on an alkaline matter and the chlorine-containing plastic, so as to obtain chlorine salt and hydrocarbon, wherein the alkaline matter comprises one or more of ferriferous oxide, alkali metal oxide, alkali metal hydrate, alkali-earth metal oxide and alkali-earth metal hydrate, and the chlorine-containing plastic comprises polyvinyl chloride. During a pyrolysis process of the chlorine-containing plastic, the specific alkaline matter is added, so that chlorine elements in the chlorine-containing plastic produce non-gaseous chlorine salt, and gaseous chlorine hydride and secondary pollution to atmospheric environment are not produced on the premise of ensuring smooth dechlorination of the chlorine-containing plastic. Experimental results indicate that when the method provided by the invention is adopted to perform dechlorination on the chlorine-containing plastic, the chlorine elements in the plastic are nearly completely fixed to the chlorine salt.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for dechlorination of chlorine-containing plastics. Background technique [0002] Due to the significant advantages of light weight, corrosion resistance, and long service life, plastic products are used in various fields such as industry, agriculture, military industry, and civil use. At present, the main treatment methods of waste plastics are landfill, incineration and recycling of chemical energy in plastics. Landfilling waste plastics not only occupies a large area, but also causes serious environmental pollution due to the long-term existence of plastics in the natural environment due to their non-natural degradability. The efficiency of incinerating waste plastics to recover energy is very low, and it is easy to cause secondary pollution. At present, Germany, Japan and other countries have developed waste plastics to replace part of coal powder into blast furnac...

Claims

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Application Information

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IPC IPC(8): C08J11/16C08L27/06C08L23/06C08L23/12
CPCC08J11/16C08J2327/06C08J2423/06C08J2423/12Y02W30/62
Inventor 洪澜叶霖海陈伟鹏王东张文帝李泰霖杨柳潘转转徐霜张如冰郑昊宾士勇
Owner SUZHOU UNIV
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