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A method for treating a waste high-polymer mixture by fractionating the mixture consisting essentially of five groups of high polymers, i.e., polyolefinic, polystyrenic, polyvinyl-chloride, thermosetting, and natural high polymers, taking advantage of their dissimilar solubilities in different organ

A method for treating a waste high-polymer mixture by fractionating the mixture consisting essentially of five groups of high polymers, i.e., polyolefinic, polystyrenic, polyvinyl-chloride, thermosetting, and natural high polymers, taking advantage of their dissimilar solubilities in different organic solvents, characterized in that the mixture is brought into contact with o-xylene, p-xylene, or m-xylene, the solvents being used either singly or in a combination of two or more, at temperatures within a certain range or ranges to dissolve and fractionate the polystyrenic and polyolefinic high polymers, and the polyvinyl chlorides in the remainder are dissolved and fractionated by using at least one solvent selected from the group consisting of tetrahydrofuran, cyclohexanone, dioxane, and methylethylketone and at a temperature within a certain range, whereby the waste mixture is fractionated into the groups of polyolefinic, polystyrenic, polyvinyl-chloride, thermosetting, and natural high polymers.

대표청구항 ▼

A method for treating a waste high-polymer mixture by fractionating the mixture consisting essentially of five groups of high polymers, comprising polyolefinic, polystyrenic, polyvinyl-chloride, thermosetting, and natural high polymers, taking advantage of their dissimilar solubilities in different

A method for treating a waste high-polymer mixture by fractionating the mixture consisting essentially of five groups of high polymers, comprising polyolefinic, polystyrenic, polyvinyl-chloride, thermosetting, and natural high polymers, taking advantage of their dissimilar solubilities in different organic solvents, which comprises bringing the mixture into contact with o-xylene, p-xylene, or m-xylene, the isomers being used either singly or in a combination of two or more, at a temperature between 5°and 50°C to dissolve and fractionate the polystyrenic high polymers, and then at a temperature between 90°and 150°C To dissolve and fractionate the polyolefinic high polymers, and finally dissolving and fractionating the polyvinyl chlorides by heating the remainder in at least one solvent selected from the group consisting of tetrahydrofuran, cyclohexanone, dioxane, and methylethylketone, at a temperature between 5°and 60°C, whereby said waste mixture is fractionated into four groups of high polymers, comprising polyolefinic, polystyrenic, polyviny-chloride, and a mixture of thermosetting and natural high polymers.