Chemical process for recycling polyethylene terephthalate...

Details Chemical process for recycling polyethylene terephthalate... Chemical process for recycling polyethylene terephthalate...

2011-02-22

2011-02-22

Choi, Ling-Siu (Department: 1765)

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

Synthetic resins

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

C521S040000, C521S040500, C521S047000, C521S048000, C528S271000, C528S272000, C528S480000, C528S488000, C528S489000, C528S495000, C528S499000, C528S50200C, C528S50200C, C528S503000

Reexamination Certificate

active

07893122

ABSTRACT:
The present invention relates to a process for chemical recycling of PET waste that comprises, among other stages, a saponification reaction stage, wherein PET waste particles are reacted with stoichiometric or excessive amounts of a strong base metal in an alcoholic reaction media, the reaction being brought to the boiling temperature of the alcoholic reaction media, preferably at atmospheric pressure, thereby obtaining as reaction products a salt of terephthalic acid with the base metal and ethylene glycol, the latter being incorporated to the alcoholic reaction media. From this reaction it is possible to afford ethylene glycol, terephthalic acid and salts thereof, which are products with a high commercial value.

REFERENCES:
patent: 3801273 (1974-04-01), Mays
patent: 6580005 (2003-06-01), Yazaki et al.
patent: 822834 (1959-11-01), None
Hu, L.-C. et al. Alkali-Decomposition of Poly(ethylene terephthalate) in Mixed Media of Nonaqueous Alcohol and Ether. Study on Recycling of Poly(ethylene terephthalate). Polymer Journal, 1997, vol. 29 N 9, paginas 708-712.
Katayannidis, G.P. et al. Poly(ethylene terephthalate) Recycling and recovery of pure Terephthalic Acid by Alkaline Hydrolysis, Advances in Polymer Technology, 2002, vol. 21, N 9, paginas 250-259.

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