Process for controlling the pH of a brine

Details Process for controlling the pH of a brine Process for controlling the pH of a brine

1990-12-28

1992-02-04

Wyse, Thomas

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210712, 210718, 210743, 210747, 210750, 210755, 210758, 55 73, 423224, 423226, C02F 502, B01D 5334

Patent

active

050857827

ABSTRACT:
In the processing of a geothermal brine and the recovery of heat therefrom, there are produced a non-condensable gas stream containing hydrogen sulfide and carbon dioxide and a liquid stream comprising a condensate of steam derived from the brine. In accordance with the present invention, the noncondensable gases are introduced into the condensate in the presence of an oxidizing agent to form a gas-liquid mixture. The mixture is maintained at an alkaline pH for a time sufficient for a substantial portion of the hydrogen sulfide to be oxidized. Thereafter, the mixture is introduced into a gas-liquid separation zone for separate recovery of a gas stream comprising a major amount of carbon dioxide and substantially free of hydrogen sulfide. Advantageously, the recovered gas stream is recycled to the geothermal brine process to reduce the pH of the brine and its scaling potential.

REFERENCES:
patent: 4123506 (1978-10-01), Spevack
patent: 4218431 (1980-08-01), Spevack
patent: 4224151 (1980-09-01), Jost
patent: 4319895 (1982-03-01), Kemmer
patent: 4410432 (1983-10-01), Domahidy
patent: 4500434 (1985-02-01), Jost et al.
patent: 4522728 (1985-06-01), Gallup et al.
patent: 4844162 (1989-07-01), Maassen et al.
patent: 4909945 (1990-03-01), Delaney
patent: 4978457 (1990-12-01), Gallup et al.
patent: 5032284 (1991-07-01), Gallup et al.

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