Process for controlling the pH of a brine

Patent · Tue Feb 04 04:00:00 EST 1992

OSTI ID:5407100

Gallup, D L; Obando, M E

This patent describes a process for recovering an using non-condensable gases produced during flashing of a geothermal brine, the gases comprising a major amount of carbon dioxide and a minor amount of hydrogen sulfide. It comprises: introducing the noncondensable gases into a condensate of steam derived from the brine in the presence of an oxidizing agent to form a mixture, maintaining the mixture at a pH in excess of 7 for a time sufficient to oxidize substantially all of the hydrogen sulfide, introducing the mixture into a gas-liquid separation zone and recovering a carbon dioxide-containing gas substantially free of sulfide, and introducing the carbon dioxide-containing gas into a geothermal brine to lower the pH thereof. This patent also describes a process for reducing the amount of scale formed during processing of a geothermal brine in which process there is produced a condensate of steam derived from the brine and noncondensable gases comprising a major amount of carbon dioxide and a minor amount of H{sub 2}S. This patent also describes a process for producing a substantially pure carbon dioxide gas stream from noncondensable gases produced during processing of a geothermal brine, during which processing there also is produced a condensate of steam derived from the geothermal brine, the noncondensable gas comprising carbon dioxide, water vapor and a minor amount of H{sub 2}S.

• Assignee: Union Oil Co. of California, Los Angeles, CA (United States)
• Patent Number(s): A; US 5085782
• Application Number: PPN: US 7-635478
• OSTI ID: 5407100
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150600 -- Geothermal Energy-- Environmental Aspects
150905* -- Geothermal Engineering-- Control Systems
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
AIR POLLUTION CONTROL
BRINES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CONTROL
FLASH HEATING
GASEOUS WASTES
GEOTHERMAL WELLS
HEATING
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
MANAGEMENT
MATERIALS RECOVERY
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLLUTION CONTROL
PROCESS CONTROL
PROCESSING
PRODUCTION
SEPARATION PROCESSES
STEAM
SULFIDES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WELLS