Method for removing miscellaneous elements from waste high polymer material by using microwave irradiation

A polymer material, microwave irradiation technology, applied in plastic recycling, recycling technology, production of bulk chemicals, etc., can solve the problems of high requirements for reaction equipment, secondary pollution of solvents, high temperature and pressure, etc., and achieve low prices. , Not easy to poison, low cost effect

Active Publication Date: 2013-02-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solvent degradation method has the above advantages, if a higher degree of removal of heteroatoms is to be achieved under mild conditions, the reaction time is longer, so the efficiency is low, and there are disadvantages of time-consuming, energy-consuming and high cost. and to remove heteroatoms quickly and efficiently, not only need higher temperature and pressure, but also require higher reaction equipment (A.J.M.Lagadec, S.B.Hawthorne, Envioron.Sci.&Tech., 2002,36(6): 1337)
On the other hand, the solvent degradation method often uses volatile organic solvents. The toxicity of the solvent and the "secondary pollution" caused by it seriously hinder the popularization and application of this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 100 parts of waste polymer materials and 10 parts of potassium hydroxide to 100 parts of polyethylene glycol, stir and mix evenly, then place it in a microwave generator, heat it at a set microwave temperature of 200°C, and irradiate for 1 minute. After the product is cooled, the solid-phase product obtained by the reaction is separated from the solvent, washed with water and dried to obtain a waste polymer material after removal of heteroatoms. The separated solvent was recovered by conventional methods, and the elemental analysis results of the obtained waste polymer materials are shown in Table 1.

Embodiment 2

[0021] Add 100 parts of waste polymer materials to 500 parts of polyethylene glycol, stir and mix evenly, then place it in a microwave generator, heat it according to the set microwave temperature of 200°C, and irradiate it for 40 minutes. After the product is cooled, put The solid phase product obtained by the reaction is separated from the solvent, washed with water and dried to obtain the waste polymer material after removal of heteroatoms. The separated solvent was recovered by conventional methods, and the elemental analysis results of the obtained waste polymer materials are shown in Table 1.

Embodiment 3

[0023] Add 100 parts of waste polymer materials, 1 part of magnesium hydroxide, 1 part of potassium hydroxide, and 1 part of sodium hydroxide into 50 parts of triethylene glycol, stir and mix evenly, then place it in a microwave generator, and press the set microwave The heating temperature is 160°C, and the irradiation reaction is performed for 30 minutes. After the product is cooled, the solid phase product obtained by the reaction is separated from the solvent, washed with water, and dried to obtain a waste polymer material after removal of heteroatoms. The separated solvent was recovered by conventional methods, and the elemental analysis results of the obtained waste polymer materials are shown in Table 1.

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Abstract

The invention discloses a method for removing miscellaneous elements from a waste high polymer material by using microwave irradiation. The method comprises the following steps of: adding 100 parts of heteroatom-containing waste high polymer material and 0-10 parts of catalyst into 10-500 parts of solvent and uniformly mixing by stirring; putting the mixture into a microwave generating device; undergoing an irradiation reaction at the preset temperature between 60 DEG C and 200 DEG C for 1-40 minutes; cooling; separating a solid phase product obtained by the reaction from the solvent; washing with water; and drying to obtain a waste high polymer material from which the heteroatoms are removed. In the method, the conventional heating way is replaced in a microwave irradiation heating way and the solvent is used, so that time and energy are saved, the environment is protected and miscellaneous elements can be removed from a waste high polymer material system at low temperature in a short period of time under the condition that no catalyst is used or the conventional catalyst is used. The method has the advantages of high efficiency, low cost, easiness and convenience in operating, and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical recovery of waste polymer materials, and specifically relates to a method for removing heteroelements, such as N, Br, Cl, S, etc., in a waste polymer material system by using microwave irradiation in a green solvent. Background technique [0002] Energy and the environment are two major themes in today's world. A large number of waste polymer materials currently exist not only cause serious environmental pollution, but also cause a great waste of social wealth. The disposal of waste polymer materials is not only the need of environmental protection, but also opens up an important way for the rational reuse of resources. [0003] At present, the treatment of waste polymer materials can be roughly divided into the following four methods: landfill method, incineration method, recycling method and chemical recycling method. Among them, the chemical recovery method is to break the polymer chains of ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08J11/24C08J11/28
CPCY02P20/54Y02W30/62
Inventor周茜李小阳王俐江先洪何小丽杜安珂陈思翀汪秀丽杨科珂王玉忠
OwnerSICHUAN UNIV