Chemical recovery method for waste polycarbonate material

A polycarbonate, easy-to-recycle technology, applied in chemical recovery, chemical instruments and methods, carbonate/haloformate preparation, etc., can solve the problems of harsh high temperature and high pressure conditions, long reaction time, etc., and meet the requirements of equipment conditions low, fast reaction, and mild reaction conditions
CN101407450AInactive Publication Date: 2009-04-15QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Publication Date
2009-04-15
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a new method for generating bisphenol A and dimethyl carbonate by solvent waste polycarbonate and chemical degradation waste polycarbonate material under a moderate condition to realize recycling of waste polycarbonate material. The method is characterized in that tetrahydrofuran, drewamine, N-methyl-pyrrolidone, 1, 2-dichloroethane, N, N-dimethyl formamide, diethylamine, ethylene dimine or composite material thereof which are easy to be recycled are used as reaction media, and with the presence of catalysts of sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, lithium hydroxide or composite material thereof, and the like, an alcoholysis reaction is carried out under a normal pressure or a high pressure and at reaction temperature of 20 DEG C-80 DEG C; and a hydrolysis reaction is carried out at reaction temperature of 50 DEG C-160 DEG C. After the reactions, product bisphenol A is obtained (alkyl dimethyl easter product is also obtained in the alcoholysis reaction) after operation processes of solvent removing, washing, drying, and the like are carried out to the reaction liquid. The deterioration rate is over 98 percent. Compared with the traditional methods, the new method for generating bisphenol A and dimethyl carbonate by solvent waste polycarbonate and chemical degradation waste polycarbonate material under a moderate condition to realize recycling of waste polycarbonate material is characterized in that: (1) the reaction conditions are moderate; the reaction speed is high; and the operation is easy and simple; and (2) the problems of long reaction time period and strict requirements for equipment condition existing in the background technology, and the like, are overcome.
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Description

technical field

[0001] The invention relates to a new method for degrading waste polycarbonate and recovering monomers through a chemical method. 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 is used in a wide range of industrial applications. Demand continues 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 their bulky size and diff...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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