Method for recovering useful components from dyed polyester fiber
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United States of America Patent
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Jun 14, 2011
Grant Date -
May 28, 2009
app pub date -
Jul 31, 2006
filing date -
Aug 5, 2005
priority date (Note) -
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Abstract
To establish an efficient and economical useful component recovery method capable of recovering high purity useful components from a dyed polyester fiber.A method for recovering useful components from a dyed polyester fiber, includes a dye extraction step, a solid liquid separation step, a depolymerization reaction step, an ester interchange reaction step, and a useful component separation step, for recovering useful components from the dyed polyester fiber, wherein the dye extraction step includes a step of extracting and removing a dye at the glass transition temperature of the polyester or higher and at 220° C. or less with a xylene extracting solvent and an alkylene glycol extracting solvent in combination.
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