Separation of polyethylene terephthalate and polyvinyl chloride using supercritical carbon dioxide
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United States of America Patent
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Oct 31, 1995
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N/A
app pub date -
Jul 13, 1994
filing date -
Jul 13, 1994
priority date (Note) -
Expired
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Abstract
A method for separating co-mingled polymeric materials, in particular polyethylene terephthalate (PET) and polyvinyl chloride (PVC) is described. The process involves selectively dissolving a supercritical fluid into one of the materials at the appropriate temperature and pressure. Upon rapid reduction of the system pressure, the selected material foams providing a change in density. Under ambient conditions, the polymeric materials having a large density difference can be separated by means of aqueous separation and flotation. The preferred supercritical fluid for the process is carbon dioxide, and PVC is the material into which the supercritical fluid is preferentially dissolved.
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