Method for recovering useful components from dyed polyester...

Details Method for recovering useful components from dyed polyester... Method for recovering useful components from dyed polyester...

2011-06-14

2011-06-14

Drodge, Joseph W (Department: 1772)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S774000, C210S806000, C264S037100, C521S048000, C521S048500, C528S272000, C528S491000, C528S50200C, C528S50200C, C528S503000, C203S039000

Reexamination Certificate

active

07959807

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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