Inhibition of silicate scale formation

Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...

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606412, 606415, 210747, 166310, C02F 510

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active

058582452

ABSTRACT:
A method for controlling fouling of a production or reinjection well, a flashing vessel or a heat-exchange surface exposed to a high-enthalpy geothermal brine that forms metal/silicon-containing scale comprises the addition of a metal complexing agent to the brine to form a fluid mixture containing a soluble metal/silicon component complex that inhibits the amount of scale formation when the temperature of the fluid mixture is reduced. The addition of a preferred metal complexing agent such as forms of EDTA, citric acid or acetic acid maintains dissolved aluminum species in the brine and inhibits the formation of aluminum silicate precipitate.

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