Process for recovering terephthalic acid from waste polyethylene

Details Process for recovering terephthalic acid from waste polyethylene Process for recovering terephthalic acid from waste polyethylene

1983-06-07

1985-09-17

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562485, 568868, 568871, C07C 51487, C07C 2988

Patent

active

045422397

ABSTRACT:
Terephthalic acid (TPA) is recovered from used polyethylene terephthalate beverage containers by reacting comminuted containers in a reaction zone with an aqueous medium containing ammonium hydroxide at elevated temperatures and pressures to form a water soluble diammonium salt of TPA, separating any undissolved solids from the reaction product, acidifying the remaining reaction product to liberate TPA, and separating the precipitated TPA. A portion of the liquid remaining after separation of TPA can be mixed with lime or slaked lime, the resulting mixture treated in an ammonia stripper to remove ammonia therefrom and the ammonia overheads from the stripper blended with another portion of the liquid remaining after separation of TPA to form a stream containing ammonium hydroxide which is recycled to the reaction zone. Ethylene glycol can be recovered from the bottoms from the ammonia stripper by distillation.

REFERENCES:
patent: 3544622 (1970-12-01), England
patent: 3849489 (1974-11-01), Rudzki
patent: 4355175 (1982-10-01), Pusztaszeri

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