Process of recovering components from scrap polyester

Details Process of recovering components from scrap polyester Process of recovering components from scrap polyester

1992-11-25

1994-03-29

Kight, III, John

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

Synthetic resins

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

521 40, 521 48, 528481, 528496, 528503, C08J 1104

Patent

active

052985300

ABSTRACT:
A process of recovering components such as ethylene glycol and dimethylterephthalate from scrap polyester. The process steps are: (a) introducing oligomers of ethylene glycol and terephthalate acid or dimethyl terephthalate to a first vessel and heating the oligomers; (b) introducing scrap polyester to the first vessel and forming a startup melt with the oligomers; (c) transferring melt from the first vessel to a second vessel; (d) passing super-heated methanol through the melt in the second vessel to form a final melt comprising low molecular weight polyesters and monomers; (e) transferring final melt from the second vessel to the first vessel; and (f) recovering components from the second vessel.

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patent: 4929749 (1990-05-01), Gupta et al.
patent: 5051528 (1991-09-01), Naujokas et al.
patent: 5095145 (1992-03-01), Rosen

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