Cooling water scale and corrosion inhibition

Details Cooling water scale and corrosion inhibition Cooling water scale and corrosion inhibition

2005-08-16

2005-08-16

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S687000, C210S696000, C159S047100, C203S010000

Reexamination Certificate

active

06929749

ABSTRACT:
A methods of the present invention for inhibiting silica scale formation and corrosion in aqueous systems where soluble silica residuals (SiO2) are maintained in excess of 200 mg/L, and source water silica deposition is inhibited with silica accumulations as high as 4000 mg/L (cycled accumulation) from evaporation and concentration of source water. The methods of the present invention also provides inhibition of corrosion for carbon steel at corrosion rates of less than 0.3 mpy (mils per year), and less than 0.1 mpy for copper, copper alloy, and stainless steel alloys in highly concentrated (high dissolved solids) waters. The methods of the present invention comprise pretreatment removal of hardness ions from the makeup source water, maintenance of electrical conductivity, and elevating the pH level of the aqueous environment. Thereafter, specified water chemistry residual ranges are maintained in the aqueous system to achieve inhibition of scale and corrosion.

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Strumm, et al.; “Formation of Polysilicates as Determined by Coagulation Effects”; Environmental Science and Technology; 1967; Vo. 1, 21-227.
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Boffardi, Bennett P., PhD; Calgon Internal Publication; 1988; Chapter 4; pp. 30-31.

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