Process for recycling polyester

Details Process for recycling polyester Process for recycling polyester

1994-04-28

1995-03-07

Acquah, Samuel A.

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

Synthetic resins

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

521 45, 75413, 75417, 75422, 528481, 528489, 528499, C08J 1104

Patent

active

053958586

ABSTRACT:
A process for recycling polyester contained in waste materials is provided. The polyester is converted into ethylene glycol and terephthalic acid. The process steps generally include first combining materials containing polyester with an alkaline solution to form a slurry. The slurry is heated, causing ethylene glycol to evaporate which can then be collected. The remaining product stream is then mixed with water and filtered to remove any undissolved impurities. The aqueous filtrate can be acidified causing terephthalic acid to precipitate. Further, if silver is contained within the materials fed to the process, the silver can also be isolated and recovered.

REFERENCES:
patent: 3047435 (1962-07-01), Wemple
patent: 3120561 (1964-02-01), Chambret
patent: 3257335 (1966-06-01), Whitfield et al.
patent: 3503904 (1970-03-01), Dietz et al.
patent: 3544622 (1970-12-01), England
patent: 3594414 (1971-07-01), Katzschmann
patent: 3647422 (1972-03-01), Wainer
patent: 3652466 (1972-03-01), Hittel et al.
patent: 3873314 (1975-03-01), Woo et al.
patent: 3884850 (1975-05-01), Ostrowski
patent: 3928253 (1975-12-01), Thornton et al.
patent: 3953502 (1976-04-01), Fassell et al.
patent: 3956088 (1976-05-01), Fassell et al.
patent: 4078143 (1978-03-01), Malik et al.
patent: 4163860 (1979-07-01), Delattre et al.
patent: 4324705 (1982-04-01), Sero et al.
patent: 4355175 (1982-10-01), Pusztaszeri
patent: 4392889 (1983-07-01), Grout
patent: 4578502 (1986-03-01), Cudmore
patent: 4578510 (1986-03-01), Doerr
patent: 4602046 (1986-07-01), Buser et al.
patent: 4605762 (1986-08-01), Mandoki
patent: 4612057 (1986-09-01), Buser et al.
patent: 4620032 (1986-10-01), Doerr
patent: 4626598 (1986-12-01), Packer et al.
patent: 5064466 (1991-11-01), Hilton
patent: 5095145 (1992-03-01), Rosen
patent: 5120768 (1992-06-01), Sisson
Research Disclosure Jan. 1981, p. 28, #20130, Silver Recovery and Polyester Recycling from Photographic Film Scrap; Clelland, et al.
Research Disclosure Dec. 1981, pp. 449-450, #21231, Separation of Polyvinylidene Chloride Copolymer Coatings from Oriented Polyester Substrates.

Affiliated with

Also associated with

Rating

Process for recycling polyester does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for recycling polyester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for recycling polyester will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1406249