Ion exchange device for purifying water, process for manufacturi

Details Ion exchange device for purifying water, process for manufacturi Ion exchange device for purifying water, process for manufacturi

1991-10-03

1993-08-24

Silverman, Stanley S.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210282, 210284, 210290, C02F 142

Patent

active

052385760

ABSTRACT:
The present invention relates to an ion exchange device for purifying water by reducing the nitrite and/or nitrate content, consisting of at least one container with a basic anion exchanger in chloride and/or sulphate form arranged therein and at least one additional basic anion exchanger layer in hydroxyl form or a hydroxyl-group-containing layer, in which the anion exchanger layers are arranged one behind the other directly and/or with the interposition of an intermediate layer and the anion exchange layer(s) in chloride and/or sulphate form is/are arranged not as a mixture but in (a) separate layer(s). The chloride and/or sulphate containing layer is arranged near or beneath the inlet aperture, preferably beneath the filter layer and/or (in the direction of flow of the water) in front of the anion exchange layer in the form of hydroxyl or containing hydroxyl groups. This invention also relates to processes for manufacturing and for using the ion exchange device to remove nitrates and/or nitrates from water.

REFERENCES:
patent: 3414508 (1968-12-01), Applebaum et al.
patent: 3420709 (1969-01-01), Barrett, Jr. et al.
patent: 3420773 (1969-01-01), Selmeczi
patent: 3497069 (1970-02-01), Lindenthal et al.
patent: 3664506 (1972-05-01), Meunier et al.
patent: 3849306 (1974-11-01), Anderson
patent: 3926559 (1975-12-01), Stevens
patent: 3985648 (1976-10-01), Casolo
patent: 4474620 (1984-10-01), Hall
patent: 4479877 (1984-10-01), Guter
patent: 4904383 (1990-02-01), Auerswald
patent: 5062957 (1991-11-01), Berreby

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