Chemical depolymerization recovery method for waste compact disks

A waste, optical disc technology, applied in chemical instruments and methods, organic chemistry, preparation of organic compounds, etc., can solve the problems of equipment corrosive environment, catalysts that cannot be reused for reaction conditions, and consumption of large inorganic strong acids or strong bases. The effect of reducing the discharge of three wastes, improving equipment corrosion and environmental pollution, and reducing energy consumption

Active Publication Date: 2012-08-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for hydrolysis and alcoholysis of waste optical disks, which overcomes the traditional methods of consuming a large amount of inorganic strong acid or alkali, equipment corrosion and serious environmental pollution, catalysts that cannot be reused and reaction conditions Harsh and other disadvantages

Method used

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  • Chemical depolymerization recovery method for waste compact disks
  • Chemical depolymerization recovery method for waste compact disks
  • Chemical depolymerization recovery method for waste compact disks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: After crushing 30.0g of waste compact discs (particle size less than 1mm), put them into an autoclave, add 20.0g of water and 30g of 1-butyl-3-methylimidazole acetate successively, and heat the Stirring and reacting for 3 hours, after cooling down to room temperature, the reaction solution was filtered, extracted, and distilled. The hydrolysis rate of PC in the waste CD was 100%, and 25.0 g of bisphenol A was obtained with a yield of 92.8%.

Embodiment 2

[0021] Example 2: The experimental conditions and steps are the same as in Example 1, except that 1-butyl-3-methylimidazole acetate is changed to 1-ethyl-3-methylimidazole acetate, and the PC in the waste CD is hydrolyzed Yield 100%, obtain bisphenol A product 24.5g, yield is 91.0%.

Embodiment 3

[0022] Example 3: The experimental conditions and steps are the same as in Example 1, except that 1-butyl-3-methylimidazole acetate is changed to 1-propyl-3-methylimidazole acetate, and the PC in the waste CD is hydrolyzed Yield 100%, obtain bisphenol A product 24.8g, yield is 92.1%.

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Abstract

The invention relates to a novel method of chemically depolymerizing waste compact disks to generate bisphenol A and carbonic acid dialkyl ester to realize chemical recycling of the waste compact disks. The method is characterized in that 1-R-3-methyl imidazole acetate ionic liquid (the R can be ethyl, propyl or butyl) which is easy in recycling is used as a reaction medium and catalyst for hydrolysis or alcoholysis reaction at 90-140 DEG C, and a bisphenol A product (as for the alcoholysis reaction, carbonic acid dialkyl ester is further obtained) is obtained through operations of filtering, extracting, distilling and the like after the reaction is completed. The yield of each of the bisphenol A and the carbonic acid dialkyl ester is higher than 90%. Compared with the prior art, the novel method has the advantages that firstly, high-concentration organic strong acid or strong base in the background art is not needed, so that the problems of equipment corrosion and environment pollution are evidently improved; and secondly, the ionic liquid having a certain dissolubility to the waste compact disks is used as the reaction medium and catalyst, on one hand, reaction conditions are mild, and on the other hand, the problem that the catalyst in the background art cannot be recycled is solved as the ionic liquid is reusable.

Description

technical field [0001] The invention relates to a new method for chemically depolymerizing waste optical discs and recovering bisphenol A and dialkyl carbonate by using ionic liquid as a reaction medium and a catalyst. technical background [0002] Along with the swift and violent development of computer and audio-visual industry, the amount of the waste CD produced is more and more. The main component of used optical discs is polycarbonate (PC). Although it is not very toxic, it is difficult to degrade under natural conditions, so it not only has a great impact on the environment, but also a huge waste of resources. Therefore, in recent years, the recycling of waste PC materials such as waste CDs has been paid more and more attention by people. [0003] At present, there are mainly two types of recycling methods for waste PC materials. One is physical methods, that is, products with low added value are prepared through melting remolding or granulation remolding. The disadv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/16C07C37/055C07C37/00C07C69/96C07C68/06
Inventor 刘福胜于世涛杨学群宋修艳
Owner QINGDAO UNIV OF SCI & TECH
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