Regeneration of acidic cationic exchange resin used in the react

Details Regeneration of acidic cationic exchange resin used in the react Regeneration of acidic cationic exchange resin used in the react

1989-10-26

1991-04-09

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210681, 210685, 423228, 423229, 521 26, B01D 1504

Patent

active

050062581

ABSTRACT:
Spent aqueous alkanolamine solution containing free alkanolamine, alkali metal salts of anions which form heat stable salts with such alkanolamine and heat stable alkanolamine salts is reactivated by contacting the solution with an acidic cation ion exchange resin to remove alkali metal cations and alkanolamine cations resulting from (1) protonation of free alkanolamine with hydrogen on the resin and (2) the alkanolamine salts, followed by eluting the resin with aqueous ammonia to preferentially displace alkanolamine from the resin and thereafter eluting the resin with a dilute mineral acid to displace the ammonia, metal cations and any remaining alkanolamine. The displaced alkanolamine is recovered for reuse. The aqueous ammonia may also be recovered for reuse.

REFERENCES:
patent: 4076618 (1978-02-01), Zeblisky
patent: 4172185 (1979-10-01), Petheram
patent: 4652352 (1987-03-01), Saieva
patent: 4770790 (1988-09-01), Oberhofer

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