Depolymerization of condensation polymers

Details Depolymerization of condensation polymers Depolymerization of condensation polymers

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 An aqueous solution of the product(s) of the hydrolysis reaction is withdrawn from an upper portion of the hydrolysis zone.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.

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