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Title: Corrosion inhibitor for aqueous ammonia absorption system

Abstract

A method is described for 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 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 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 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. 5 figs.

Inventors:
;
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
672636
Patent Number(s):
US 5,811,026/A/
Application Number:
PAN: 8-696,789; CNN: Contract 15X-17497C
Assignee:
Phillips Engineering Co., St. Joseph, MI (United States) PTO; SCA: 360105; 320106; PA: EDB-98:119746; SN: 98002026826
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 22 Sep 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ABSORPTION REFRIGERATION CYCLE; AMMONIA; CORROSION INHIBITORS; AIR CONDITIONERS; HEAT PUMPS; HYDROXYL RADICALS; CARBON STEELS; WORKING FLUIDS; CORROSION PROTECTION

Citation Formats

Phillips, B.A., and Whitlow, E.P.. Corrosion inhibitor for aqueous ammonia absorption system. United States: N. p., 1998. Web.
Phillips, B.A., & Whitlow, E.P.. Corrosion inhibitor for aqueous ammonia absorption system. United States.
Phillips, B.A., and Whitlow, E.P.. Tue . "Corrosion inhibitor for aqueous ammonia absorption system". United States.
@article{osti_672636,
title = {Corrosion inhibitor for aqueous ammonia absorption system},
author = {Phillips, B.A. and Whitlow, E.P.},
abstractNote = {A method is described for 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 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 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 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. 5 figs.},
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}
}