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US 5,811,026 AGranted
Corrosion inhibitor for aqueous ammonia absorption system
AssigneePhillips Engineering Co.
InventorsBenjamin A. Phillips, Eugene P. Whitlow
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AssigneePhillips Engineering Co.
InventorsBenjamin A. Phillips, Eugene P. Whitlow
Estimating the term…
A method of inhibiting corrosion and the formation of hydrogen and thus improving absorption in an ammonia/water absorption refrigeration, air conditioning or heat pump system by maintaining the hydroxyl ion concentration of the aqueous ammonia working fluid within a selected range under anaerobic conditions at temperatures up to 425.degree. F. This hydroxyl ion concentration is maintained by introducing to the aqueous ammonia working fluid an inhibitor in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the inhibitor relative to the water content ranging from about 0.015 N to about 0.2 N at 25.degree. C. Also, working fluids for inhibiting the corrosion of carbon steel and resulting hydrogen formation and improving absorption in an ammonia/water absorption system under anaerobic conditions at up to 425.degree. F. The working fluids may be aqueous solutions of ammonia and a strong base or aqueous solutions of ammonia, a strong base, and a specified buffer.
A method of inhibiting corrosion and the formation of hydrogen in a steel absorption refrigeration, air conditioning or heat pump apparatus using an aqueous ammonia working fluid under anaerobic conditions at temperatures up to about 425.degree. F., comprising introducing to the aqueous ammonia working fluid a strong base in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the strong base in the water prior to the addition of ammonia ranging from about 0.015N to about 0.2N at 25.degree. C.
A composition for use as a working fluid in a steel absorption refrigeration, air conditioning or heat pump apparatus under anaerobic conditions at temperatures up to about 425.degree. F., comprising aqueous ammonia, and a strong base present in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the strong base in the water prior to the addition of ammonia ranging from about 0.015N to about 0.2N at 25.degree. C.
Dependencies are inferred from the claim text.