Alcoholysis method of the hottest waste recycled p

2022-08-15
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Alcoholysis method of waste recycled plastics

alcoholysis is a method that uses the hydroxyl of alcohols to alcoholize some polymers and recycle raw materials. This method can be used for polyurethane, polyester and other plastics

polyhydric ester: a mixture of amine and ethylene glycol produced after polyurethane hydrolysis. Although the price is one of the major factors considered by the purchaser, it can be recycled only after separation. This process is not needed for alcoholysis, and the process is quite simple

the waste polyhydric ester foam (both soft and hard) is alcoholized at 185 ~ 200 ℃ in the presence of ethylene glycol. This alcoholysis process also includes the ester group transfer between the carbonate group in the polyurethane foam and the ethylene glycol solvent. This reaction produces only one product, polyol mixture. The recovered mixed polyol can be reused without separation. In fact, it is difficult to distinguish the foam produced with alcoholysis recovered ethylene glycol from the foam produced with pure ethylene glycol. Alcoholysis is also applicable to the decomposition and recycling of isocyanate foam waste, which is the reason for this kind of phenomenon

in industry, the alcoholysis process is also very simple. The pre shredded or ground waste polyurethane foam is sent to the reactor equipped with ethylene glycol and reacted in nitrogen atmosphere at 185 ~ 200 ℃. The rate of waste entering the reactor depends on the mixing method, materials, excellent UV and weather resistance types and heat transfer forms. It needs to be fully stirred and well mixed to prevent the foam from floating on the liquid level of ethylene glycol. Cleaning and cleaning of polyurethane foam: some dust will inevitably be generated in the experimental process. Organometallic compounds and tertiary amine catalysts can also be added to the alcoholysis recovery of waste materials

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