Chemical recovery method for waste polycarbonate material in ionic liquid surrounding
An ionic liquid and polycarbonate technology, which is applied in chemical instruments and methods, plastic recycling, organic carbonate preparation, etc., can solve the problems of catalysts that cannot be recycled, reaction conditions, equipment corrosive environment, consumption of large inorganic strong acids or strong bases, etc. , to achieve the effect of improving equipment corrosion and environmental pollution problems and reducing the discharge of three wastes
Inactive Publication Date: 2009-05-13
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology
[0005] The purpose of the present invention is to provide a new method for hydrolysis and alcoholysis of waste PC, which overcomes the need to consume a large amount of inorganic strong acid or strong alkali, serious equipment corrosion and environmental pollution, catalysts that cannot be recycled and harsh reaction conditions that exist in the traditional method and other shortcomings
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Effect test
Embodiment 1
[0021] Example 1: Put 15.0 g of waste PC into an autoclave, add 15.0 g of water and 15 g of 1-allyl-3-methylimidazole chloride in sequence, and stir and react at 150°C for 2.5 hours after the addition, until After room temperature, the reaction solution was filtered, extracted, distilled, etc., and the degradation rate of PC was 100%, and 12.6 g of bisphenol A product was obtained with a yield of 93.5%.
Embodiment 2
[0022] Embodiment 2: The experimental conditions and steps are the same as in Example 1, except that 1-allyl-3-methylimidazole chloride is changed to 1-butyl-3-methylimidazole bromide, and the degradation rate of PC is 100%. Bisphenol A product 12.0g, the yield is 89.1%.
Embodiment 3
[0023] Embodiment 3: Experimental condition and step are the same as embodiment 1, just change 1-allyl-3-methylimidazole chloride into 1-ethyl-3-picoline bromide, PC degradation rate 100%, obtain Bisphenol A product 12.4g, yield is 92.1%.
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The invention relates to a novel method for generating bisphenol A and dialkyl carbonate by chemical degradation of waste polycarbonate (PC) to realize chemical recycling of the bisphenol A and the dialkyl carbonate. The method is characterized in that reusable ionic liquid such as chloridized 1-allyl-3-methylimidazole and bromized 1-butyl-3-methylimidazole is taken as a reaction medium and catalyst, and subjected to hydrolysis reaction or alcoholysis reaction at a temperature of between 60 and 170 DEG C; after reaction is over, bisphenol A products are obtained after extraction, distillation and other operations (as for alcoholysis reaction, the dialkyl carbonate is obtained simultaneously); reclaimed ionic liquid is directly reused without any treatment; and the yield of the bisphenol A is more than 93 percent. Compared with the prior art, the method has the characteristics that: firstly, the method overcomes the defects in the prior art that high-concentration inorganic strong acid/strong alkali is applied and can not be recycled; and secondly, due to adoption of the ionic liquid which has certain solubility on the PC as the reaction medium and the catalyst, the method relieves the reaction conditions on one hand and can realize reutilization of the ionic liquid on the other hand, and obviously solves the problems of equipment corrosion and environmental pollution.
Description
technical field [0001] The invention relates to a new method for chemically degrading waste polycarbonate (PC) materials and recovering monomers by using ionic liquid as a reaction medium and a catalyst. technical background [0002] Polycarbonate PC is one of the fastest growing engineering plastics in recent years. Among them, polycarbonate bisphenol A has good properties, such as transparency, heat resistance, impact resistance, etc., and its production and demand continue to expand . Its products have been widely used in electronics, automobiles, clothing, medicine and other industries. With the rapid development of computer and audio-visual industries, the production and demand of PC materials are increasing day by day. At the same time, the amount of waste polycarbonate material produced will increase. Although these waste polycarbonate materials are not very toxic, they not only have a great impact on the environment, but also cause a huge waste of resources due to ...
Claims
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IPC IPC(8): C07C39/16C07C37/00C08J11/22B01J31/02
CPCC08G64/42B01J2231/40C07C68/06C08J2369/00B01J31/0284C07C37/0555C08J11/24C08J11/28Y02W30/62C07C69/96C07C39/16
Inventor 刘福胜于世涛李卓
Owner QINGDAO UNIV OF SCI & TECH
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