METHOD FOR SEPARATION/REMOVAL OF FOREIGN MATERIAL FROM POLYESTER FIBER WASTE

摘要

Disclosed is a method for collecting a useful component from a polyester fiber waste mainly comprising a polyalkylene terephthalate, specifically for separating/removing a foreign material (in the most cases, cotton) from a polyester fiber waste. Specifically disclosed is a method for separating/removing a foreign material other than a polyalkylene terephthalate from a polyester fiber waste which mainly comprises the polyalkylene terephthalate and contains the foreign material. The method comprises the steps of charging the polyester fiber waste into a depolymerization tank to cause a part or the whole of the polyester fiber to be depolymerized with an alkylene glycol, thereby producing a depolymerization solution; and feeding the depolymerization solution to a foreign material separation/removal apparatus having a specific characteristic properties continuously or intermitetntly.