Apparatus and method for adding carbon dioxide gas to ultra pure

Details Apparatus and method for adding carbon dioxide gas to ultra pure Apparatus and method for adding carbon dioxide gas to ultra pure

1998-11-20

2000-12-12

Smith, Duane

Gas and liquid contact apparatus

Fluid distribution

Pumping

261 641, 261100, 261107, 261DIG7, B01F 304

Patent

active

061587214

ABSTRACT:
A small flow of a water with a high carbon dioxide content (normally a carbon-dioxide-saturated water) is produced using hollow-fiber membranes, and is uniformly mixed with a large flow of untreated water with constant proportions. Since the hollow-fiber membrane module has a reserve capacity for adding carbon dioxide to the water, the resistivity of the mixed water is maintained at a constant level by maintaining constant proportions of the small and large flows, even if the total flow rate fluctuates due to fluctuations in the rate of water used in a subsequent process. Accordingly, no automated control device is particularly necessary in order to maintain the resistivity at a constant level. Therefore, a compact and simple apparatus can be produced which can operate at a low cost.

REFERENCES:
patent: 4173178 (1979-11-01), Wieland
patent: 4664681 (1987-05-01), Anazawa et al.
patent: 4673443 (1987-06-01), Fetty
patent: 5192320 (1993-03-01), Anazawa et al.
WPI Abstract and full text of French 2656546.
WPI Abstract of Japan 10324502.

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