Method for recovering mixed plastic matter
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United States of America Patent
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N/A
Issued Date -
Aug 7, 2003
app pub date -
Jan 9, 2003
filing date -
Dec 15, 2000
priority date (Note) -
Abandoned
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Abstract
A process for treating mixed plastics waste that comprises macromolecular polymers and low molecular weight polymers is described. The process includes the steps of: introducing the mixed plastics waste into an organic solvent to produce a suspension, the solvent being one in which at least one of the macromolecular polymers is soluble at a specific temperature; maintaining the suspension at a normal pressure and at an operating temperature at which none of the macromolecular polymers dissolve; extracting the low molecular weight polymers from the mixed plastics waste to produce a solution containing dissolved low molecular weight polymers and an extracted mixed plastics waste; and removing the extracted mixed plastics waste. The process can include additional steps, such as dissolving at least one of the macromolecular polymers at a temperature (T1) that is different from the operating temperature and separating the dissolved macromolecular polymer from the remaining polymers before dissolving the low molecular weight polymers.
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