Ion-exchange process for desalting water and subsequent regenera

Details Ion-exchange process for desalting water and subsequent regenera Ion-exchange process for desalting water and subsequent regenera

1976-04-22

1977-08-02

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 34, B01D 1506

Patent

active

040394425

ABSTRACT:
Water to be desalted in an ion-exchange process is contacted with a first cation exchanger in the form of a monovalent cation, and a first anion exchanger. The resultant treated solution is then reacted with a second, weakly acidic cation exchanger in the form of a free acid and, in certain applications, with a second weakly basic anion exchanger in the form of a free base to complete the desalting portion of the process. The second ion exchangers are then regenerated with the use of desalted water at a temperature greater than 30.degree. C, and the products of such reaction (including a hydroxide of the monovalent cation) are employed to regenerate one or more of the remaining exhausted ion exchangers.

REFERENCES:
patent: 3425937 (1969-02-01), Weiss et al.
patent: 3679580 (1972-07-01), Boari et al.
patent: 3716481 (1973-02-01), Battaerd
Kunin et al., Ion Exchange Resins, New York, John Wiley & Sons, Inc., 1950, pp. 26 & 27.

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