Mixed bed polishing process

Details Mixed bed polishing process Mixed bed polishing process

1981-12-07

1984-09-18

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210679, 210686, 521 26, B01J 4900

Patent

active

044722826

ABSTRACT:
A mixed bed polishing process for regeneration of an exhausted mixed resin bed of cation exchange and anion exchange resins of different densities comprising the steps of scrubbing with air the exhausted mixed resin bed and adding into the mixed resin bed inert resins having a density intermediate the densities of the cation exchange and anion exchange resins. The exhausted mixed resin bed is backwashed to separate into three layers the cation exchange, anion exchange and inert resins. The anion exchange resins are transferred to an anion regenerator; and then, the inert resins are transferred to an inert resin storage tank. The cation exchange resins are regenerated with acid; and then, the anion exchange resins are regenerated with caustic regenerant. The regenerated cation exchange and regenerated anion exchange resins are separately rinsed, and then, mixed together and rinsed.

REFERENCES:
patent: 2666741 (1954-01-01), McMullen
patent: 3455819 (1969-07-01), Crits
patent: 3583908 (1971-06-01), Crits
patent: 4191644 (1980-03-01), Lembo et al.
patent: 4264439 (1981-04-01), Lefevre et al.

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