Process for recycling polyester materials

Details Process for recycling polyester materials Process for recycling polyester materials

2007-03-20

2007-03-20

Yoon, Tae H (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

C521S048000

Reexamination Certificate

active

10955297

ABSTRACT:
The present invention is a process for recycling colored polyester. More specifically, colored polyester for recycling is depolymerized by the addition of glycol to form the monomer BHET. The BHET is contacted with activated carbon to remove some colorant. The remaining colorant is extracted with water, alcohol, or glycol to produce white, purified BHET. The white, purified BHET is separated from the extraction solvent (water, alcohol, or glycol) by filtering, decanting, or centrifuging, for example. The purified BHET monomer can be polymerized to polyethylene terephthalate meeting food contact specifications, using known polymerization processes.

REFERENCES:
patent: 5504121 (1996-04-01), West
patent: 5602187 (1997-02-01), West
patent: 5635584 (1997-06-01), Ekart et al.
patent: 5869543 (1999-02-01), Boos et al.
patent: 6630601 (2003-10-01), Inada et al.
patent: 6642350 (2003-11-01), Asakawa et al.

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