Corrosion inhibitor for aqueous ammonia absorption system
Abstract
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.
- Inventors:
-
- Benton Harbor, MI
- St. Joseph, MI
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 871853
- Patent Number(s):
- 5811026
- Application Number:
- 08/696,789
- Assignee:
- Phillips Engineering Company (St. Joseph, MI)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23F - NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
- DOE Contract Number:
- 15X-17497C
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- corrosion; inhibitor; aqueous; ammonia; absorption; method; inhibiting; formation; hydrogen; improving; water; refrigeration; air; conditioning; heat; pump; maintaining; hydroxyl; concentration; fluid; selected; range; anaerobic; conditions; temperatures; 425; degree; maintained; introducing; amount; effective; produce; corresponding; normality; relative; content; ranging; 015; 25; fluids; carbon; steel; resulting; solutions; strong; base; specified; buffer; selected range; air conditioning; absorption refrigeration; heat pump; aqueous solution; aqueous solutions; carbon steel; amount effective; anaerobic conditions; strong base; water content; inhibiting corrosion; resulting hydrogen; aerobic conditions; /252/62/210/422/
Citation Formats
Phillips, Benjamin A, and Whitlow, Eugene P. Corrosion inhibitor for aqueous ammonia absorption system. United States: N. p., 1998.
Web.
Phillips, Benjamin A, & Whitlow, Eugene P. Corrosion inhibitor for aqueous ammonia absorption system. United States.
Phillips, Benjamin A, and Whitlow, Eugene P. Tue .
"Corrosion inhibitor for aqueous ammonia absorption system". United States. https://www.osti.gov/servlets/purl/871853.
@article{osti_871853,
title = {Corrosion inhibitor for aqueous ammonia absorption system},
author = {Phillips, Benjamin A and Whitlow, Eugene P},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 22 00:00:00 EDT 1998},
month = {Tue Sep 22 00:00:00 EDT 1998}
}
Works referenced in this record:
Causes and prevention of the formation of noncondensible gases in ammonia absorption refrigeration machines.
report, January 1920
- McKelvy, E. C.; Isaacs, A.
392. The mechanism of inhibition of corrosion of iron by chromic acid and potassium chromate
journal, January 1949
- Mayne, J. E. O.; Pryor, M. J.
- Journal of the Chemical Society (Resumed)
The Influence of Hydrogen, Oxygen, and Ammonia on the Corrosion Behavior of Plain Carbon Steel in High Temperature Water
journal, October 1968
- Wilde, B. E.
- Corrosion, Vol. 24, Issue 10
The Breakdown and Repair of Inhibitive Films in Neutral Solution
journal, December 1976
- Cohen, Morris
- CORROSION, Vol. 32, Issue 12
An Electron Diffraction Study of Films Formed by Sodium Nitrite Solution on Iron
journal, April 1952
- Cohen, M.
- The Journal of Physical Chemistry, Vol. 56, Issue 4