On-line tests of organic additives for the inhibition of the precipitation of silica from hypersaline geothermal brine
A number of compounds have been screened as potential scale control agents by examining their effect on the precipitation of silica from Magmamax No. 1 brine. The substances were tested using the Lawrence Livermore Laboratory scale-control test system at the Niland, California, test site. Solutions of the test substances were injected into flowing brine at approx. 200/sup 0/C, the brine was flashed at 125/sup 0/C, and then the kinetics of solids and silica precipitation from effluent brine held at 90/sup 0/C were measured. Compounds tested include a variety of cellulose derivatives, ethylene oxide polymers, several polyethoxylated surfactants, and a phosphonate. The ethylene oxide moiety was confirmed as the source of activity in substances that inhibit the precipitation of silica at 90/sup 0/C, and the polyethylene glycols in the molecular weight range of approximately 10,000 to 100,000 are the most effective. A brief, in-plant scaling test with the most promising precipitation inhibitor showed that, although it significantly retarded scaling at 90/sup 0/C, there was no improvement at 125/sup 0/C or higher, and at 125/sup 0/C there may have been a slight increase in scaling rate.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6444210
- Report Number(s):
- UCID-18091
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150903* -- Geothermal Engineering-- Corrosion
Scaling & Materials Development
ADDITIVES
ALKALI METAL COMPOUNDS
ALUMINIUM CHLORIDES
ALUMINIUM COMPOUNDS
BRINES
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
CORROSION INHIBITORS
CORROSION PROTECTION
EVAPORATION
FLASHING
FLUIDS
GEOTHERMAL FLUIDS
Geothermal Legacy
HALIDES
HALOGEN COMPOUNDS
MINERALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLYETHYLENE GLYCOLS
POLYMERS
POTASSIUM COMPOUNDS
POTASSIUM PHOSPHATES
PRECIPITATION
SCALE CONTROL
SCALING
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACTANTS
TEST FACILITIES
TURBINES
TURBOMACHINERY