Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1983-12-21
1986-08-12
Trousof, Natalie
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
540451, 540538, 544352, 562485, 562486, 562593, 564497, 564498, 568868, 568871, C07C 51487, C07C 2702, C07C 8526, C07D48700, C07D21000
Patent
active
046057625
ABSTRACT:
A process for the neutral hydrolytic depolymerization of condensation polymers is described. The process is conducted in a continuous manner and comprises introducing condensation polymer waste material into an aqueous hydrolysis zone at a temperature of between 200.degree. C. and 300.degree. C. and superatmospheric pressure of at least 15 atmospheres. High pressure steam is introduced into the lower portion of the hydrolysis zone underneath the level of the condensation polymer waste material. The steam serves as the principal source of heat for the hydrolysis zone. By being introduced underneath the level of the condensation polymer waste material, the steam agitates the waste material to provide heat transfer to accelerate the hydrolysis reaction. Further, a portion of the steam condenses to provide water which is a reactant in the hydrolysis reaction. An aqueous solution of the product(s) of the hydrolysis reaction is withdrawn from an upper portion of the hydrolysis zone.
REFERENCES:
patent: 2793235 (1957-05-01), Jenkinson
patent: 3120561 (1964-02-01), Chambret
patent: 3223731 (1965-12-01), Craig
patent: 3952053 (1976-04-01), Brown et al.
Celanese Mexicana S.A.
Clarke Vera C.
Stine Forrest D.
Trousof Natalie
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