Aqueous ammonia corrosion inhibitor
OwnerDonald C. Ericksoninventor
Life of this patent
Estimating the term…
Abstract
A corrosion-inhibited working fluid for an aqueous ammonia absorption cycle apparatus is charged with an alkali metal base in the concentration range of 0.0003 to 0.0063 moles per liter of water. A process for controlling corrosion and hydrogen generation in the aqueous ammonia absorption cycle apparatus is also disclosed.
Claims18
A corrosion-inhibited working fluid for an aqueous ammonia absorption cycle apparatus comprises ammonia, water, and alkali metal base at a concentration in the range of 0.0003 to 0.0063 moles per liter of water.
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 190° C., comprising introducing to the aqueous ammonia working fluid an alkali metal base in an amount effective to produce a concentration in water prior to the addition of ammonia in the range of about 0.0003 to 0.0063 moles per liter of water at 25° C.
A process for controlling corrosion and H2 generation in an aqueous ammonia absorption cycle apparatus comprising:
- a) pre-oxidizing said apparatus so as to form an Fe3O4 (ferroso-ferric oxide) film;
- b) supplying pure water which is de-oxygenated and de-carbonated as charge together with ammonia to said apparatus;
- and
- c) adding alkali metal base to said water to a concentration between 0.0003 and 0.0063 moles per liter of water.
Dependencies are inferred from the claim text.