Water purification process

Details Water purification process Water purification process

1996-09-05

1999-08-10

Cintins, Ivars

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210664, 210668, 210669, 210677, 210900, C02F 900

Patent

active

059354410

ABSTRACT:
Ultrapure water containing less than 10 ppt total ions, other than hydrogen ion and hydroxide ion is produced by passing deionized water through a system comprising an ultrafiltration step, an oxidizing step where water is exposed to ultraviolet light and ion exchange step. The treated water is recirculated through the oxidizing step and the ion exchange step. Product water from the system can be recovered on a continuous basis so long as the ratio of volume of water circulated within the system to volume of water drawn from the system is at least 10 and preferably at least 20.

REFERENCES:
patent: 3870033 (1975-03-01), Faylor
patent: 4430226 (1984-02-01), Hegde et al.
patent: 4990260 (1991-02-01), Pisani
International Search Report for International Application No. PCT/US97/13049; date of Mailing Nov. 24, 1997 (7 pages).
International Preliminary Examination Report for International Application No. PCT/US97/13049; date of Mailing Dec. 3, 1998 (6 pages).
"Reinstwasser von A biz Z, " H. Bendlin, VCH, Weinhweim (1995), Germany, pp. 41-42.

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