On-line tests of organic additives for the inhibition of the precipitation of silica from hypersaline geothermal brine II. Tests of nitrogen-containing compounds, silanes, and additional ethoxylated compounds
Several new classes of organic compounds have been screened as potential geothermal 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 Brine Treatment Test System at the Niland, California, Test Site. Solutions of the test substances were injected into flowing brine at 210{sup 0}C, the brine was flashed to 125{sup 0}C, and then the kinetics of solids and silica precipitation from effluent brine held at 90{sup 0}C were measured. Three new types of compounds were shown to have activity as precipitation inhibitors: polyethylene imines, polyethyloxazalines, and quaternary ammonium compounds containing polyoxyethylene. Among the latter, Ethoquad 18/25, which is methyl-polyoxyethylene(15) octadecylammonium chloride, is the leading candidate antiscalant. It is a more powerful inhibitor of silica precipitation than the pure polyoxyethylene polymers, and it apparently has no high temperature solubility limitations. Measurements were made of the concentrations of monomeric silica and the effect of addition of inhibitor at various points in the Brine Treatment Test System. Five different silane compounds showed no activity toward silica.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6048498
- Report Number(s):
- UCID-18195
- Country of Publication:
- United States
- Language:
- English
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On-line tests of organic additives for the inhibition of the precipitation of silica from hypersaline geothermal brine
On-line tests of organic additives for the inhibition of the precipitation of silica from hypersaline geothermal brine III. Scaling measurements and tests of other methods of brine modification
Related Subjects
150903* -- Geothermal Engineering-- Corrosion
Scaling & Materials Development
AMMONIUM COMPOUNDS
BRINES
CHALCOGENIDES
CONTROL
CORROSION INHIBITORS
CORROSION PROTECTION
FLUIDS
GEOTHERMAL FLUIDS
Geothermal Legacy
HYDRIDES
HYDROGEN COMPOUNDS
MINERALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PRECIPITATION
SCALING
SEPARATION PROCESSES
SILANES
SILICA
SILICON COMPOUNDS
SILICON OXIDES