FIELD: chemistry.
SUBSTANCE: method of extracting useful components from dyed polyester fibre involves a step for extracting dye, a step for separating solid substance and liquid, a step for depolymerisation reaction, a step for reesterification reaction and a step for extracting useful components. The step for extracting dye involves a step for extracting and removing dye at temperature ranging from glass transition point of polyester to 220°C through extraction with a solvent containing xylene and alkylene glycol.
EFFECT: efficient and cheap method which enables extraction of highly pure useful components from dyed polyester fibre.
14 cl, 2 ex
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