Formation of gas hydrate with CFC alternative R-134a
- Keio Univ., Yokohama (Japan)
Gas hydrates are a class of solids, in which molecules of various compounds (guest species) are enclosed in icelike lattices that are made of hydrogen-bonded water molecules. Some CFC's (chlorofluorocarbons) such as R 11 (trichlorotrifluoromethane; CCl/sub 3/F) and R-12 (dichlorodifluoromethane, CCl/sub 2/F/sub 2/) are known to form gas hydrates, serving as guest species, which can exist at temperatures up to about 281.6 and 285.2 {Kappa}, respectively. The R-11 and R-12 hydrates had been considered the most favorable substances as cool storage media for residential air conditioning systems till restrictions on the use of CFC's became increasingly tight. R-134a (1,1,1,2-tetrafluoroethane, CF/sub 3/CH/sub 2/F) is currently considered a prospective substitute for R-12. In the present work, the authors explore if R-134a can form a gas hydrate and, if it can, to determine, with a reasonable accuracy for practical purpose, the highest temperature at which the hydrate can exist, i.e., the temperature of the quadruple point where the hydrate, R-134a in both vaporous and liquid states, and water in liquid state would coexist.
- OSTI ID:
- 5379078
- Journal Information:
- A.I.Ch.E. Journal (American Institute of Chemical Engineers); (USA), Vol. 35:7; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
GAS HYDRATES
CHEMICAL PROPERTIES
RESIDENTIAL BUILDINGS
AIR CONDITIONING
CHEMICAL BONDS
ETHANE
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN
LIQUIDS
METHANE
REFRIGERATION
VAPORS
WATER
ALKANES
BUILDINGS
COOLING
ELEMENTS
FLUIDS
GASES
HYDRATES
HYDROCARBONS
HYDROGEN COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
400201 - Chemical & Physicochemical Properties