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An absorption-cycle refrigerator which uses ammonia as the circulating refrigerant.

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A chemical process operating at elevated pressure; for example, phenol manufacture at 330 atmospheres (1 atmosphere 101,325 pascals), ethylene polymerization at 2000 atm, ammonia synthesis at 100 1000 atm, and synthetic-diamond manufacture up to 100,000 atm.


Based on the use of hydrazine and neutralizing amines or ammonia. Leaves no solids in the boiler.


Any combination of nitrogen and oxygen in a compound form. The most common in terms of environmental considerations is NO, which constitutes 90% of combustion NOx emissions, and NO2. All NO is eventually converted to NO2 in the atmosphere. Hence, most regulations are written to assume that the NOx which is emitted is in the form of NO2. Nox emissions are influenced by many factors, including furnace temperature, flame temperature, burner design, combustion air temperature, nitrogen content of liquid fuels, ammonia content of gas fuels, and other factors.


The temperature at which a liquid boils. As the boiling temperature rises with an increase in pressure (see saturated vapor pressure), the boiling temperatures are usually given for atmospheric pressure. At this pressure, water boils at +100° C., butane at - 0.5° C., ammonia at - 33° C. and propane at - 43° C.


A white powdery substance produced by the reaction of ammonia with carbon dioxide.


A device that decreases the volume of a quantity of gaseous ammonia by the amplification of pressure; used in refrigeration systems.


A hydrometer designed specifically to determine the density of aqueous ammonia solutions.


A device in an ammonia refrigerating system that raises the pressure of the ammonia gas in the evaporating coil, conditions the ammonia, and delivers it to the condensing system.


1. A multifunction test meter, measuring volts, ohms, and amperes. Also known as set analyzer. 2. The component of an absorption refrigeration system where the mixture of water vapor and ammonia vapor leaving the generator meets the relatively cool solution of ammonia in water entering the generator and loses some of its vapor content.


A process that employs promoted iron oxide catalyst for synthesis of ammonia from nitrogen and hydrogen.

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