Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1990-10-31
1993-03-02
Hruskoci, Peter
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
606412, 606415, 166300, 166310, 210698, 210743, 210747, C02F 508
Patent
active
051906643
ABSTRACT:
A method for controlling fouling of a heat exchange surface exposed to a high-enthalpy geothermal brine tending to form silica scale, but containing less than a saturated amount of cations capable of reacting with sulfates. The method adds a limited amount of sulfuric acid to the brine to form a mixture. The amount of sulfuric acid is limited to that required to produce sulfates sufficient to apparently complex with silica, but less than the amount required to increased the sulfates to above saturation amounts of sulfate reacting cations, significantly reducing or virtually eliminating sulfate and silica deposits and fouling. The addition is further controlled to an amount which reduces the pH of the mixture to no less than about 4.5. The addition does not significantly increase corrosion rates of mild steel heat exchanger materials of construction.
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Barnes Michael L.
Cope Douglas
Gallup Darrell L.
Kolimlim Quirino S.
Leong John K.
Hruskoci Peter
Jacobson William O.
Union Oil Company of California
Wirzbicki Gregory F.
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