Method of recovering polyvinyl chloride from solvent-containing waste PVC pastes
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Mar 30, 1992
filing date -
Apr 24, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Reuseable polyvinyl chloride is recovered from solvent-loaded waste polyvinyl chloride paste by adding one twentieth of the paste weight of an acyl polyethylene glycol ester, then adding about twice the paste weight of water, while stirring, driving off the solvent by steam distillation, separating the solvent from the resulting two-phase distillate, and filtering off and drying the polyvinyl chloride granules floating in water left behind in the distillation residue.
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