Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Corrosion inhibitor for aqueous ammonia absorption system

Patent ·
OSTI ID:871853
 [1];  [2]
  1. Benton Harbor, MI
  2. St. Joseph, MI
+ Show Author Affiliations

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Assignee:
Phillips Engineering Company (St. Joseph, MI)
Patent Number(s):
US 5811026
Application Number:
08/696,789
OSTI ID:
871853
Country of Publication:
United States
Language:
English

References (5)

Causes and prevention of the formation of noncondensible gases in ammonia absorption refrigeration machines. report January 1920
The Influence of Hydrogen, Oxygen, and Ammonia on the Corrosion Behavior of Plain Carbon Steel in High Temperature Water journal October 1968
An Electron Diffraction Study of Films Formed by Sodium Nitrite Solution on Iron journal April 1952
392. The mechanism of inhibition of corrosion of iron by chromic acid and potassium chromate journal January 1949
The Breakdown and Repair of Inhibitive Films in Neutral Solution journal December 1976

Similar Records

Corrosion inhibitor for aqueous ammonia absorption system
Patent · Tue Sep 22 00:00:00 EDT 1998 · OSTI ID:672636
Hydrogen sulfide corrosion inhibitor for hydrocracking units
Journal Article · Thu May 01 00:00:00 EDT 1986 · Chem. Technol. Fuels Oils (Engl. Transl.); (United States) · OSTI ID:5373536
Corrosion inhibitor for hot acids
Patent · Mon Mar 28 23:00:00 EST 1966 · OSTI ID:6625077

Related Subjects

/252/62/210/422/
015
25
425
absorption
absorption refrigeration
aerobic conditions
air
air conditioning
ammonia
amount
amount effective
anaerobic
anaerobic conditions
aqueous
aqueous solution
aqueous solutions
base
buffer
carbon
carbon steel
concentration
conditioning
conditions
content
corresponding
corrosion
degree
effective
fluid
fluids
formation
heat
heat pump
hydrogen
hydroxyl
improving
inhibiting
inhibiting corrosion
inhibitor
introducing
maintained
maintaining
method
normality
produce
pump
range
ranging
refrigeration
relative
resulting
resulting hydrogen
selected
selected range
solutions
specified
steel
strong
strong base
temperatures
water
water content