Cooling water scale and corrosion inhibition

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

2006-10-17

2006-10-17

Hruskoci, Peter A. (Department: 1724)

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Process control in response to analysis

C159S047100, C203S010000, C210S652000, C210S687000, C210S696000, C422S013000, C422S014000

Reexamination Certificate

active

07122148

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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