Measurements of the vapor pressures of difluoromethane, 1-chloro-1,2,2,2-tetrafluoroethane, and pentafluoroethane

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00016a038· OSTI ID:7177819

Weber, L A; Silva, A M ^[1]

---

1. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Chemical Science and Technology Lab.

Information about vapor pressures is important initially to qualify potential candidates as working fluids in refrigeration machinery. Later, it is also very useful in calculating the thermodynamic properties necessary for the design of that machinery. The authors present new measurements of the vapor pressures of difluoromethane (R32) from 235 to 265 K, of 1-chloro-1, 2, 2, 2-tetrafluoroethane (R124) from 220 to 286 K, and of pentafluoroethane (R125) from 218 to 286 K. Measurements were made in two ebulliometers, one of glass and one of metal. Overall, pressures ranged from 13 to about 950 kPa. The authors also present vapor pressures of R125, calculated via thermodynamic relationships, for temperature down to 170 K (2.3 kPa). They study the azeotropic mixture of R125 with chloropentafluoroethane (R115), and they correct the data for a small R115 impurity.

• OSTI ID: 7177819
• Journal Information: Journal of Chemical and Engineering Data; (United States), Journal Name: Journal of Chemical and Engineering Data; (United States) Vol. 39:4; ISSN JCEAAX; ISSN 0021-9568
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106 -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHLOROFLUOROCARBONS
DATA
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MACHINERY
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRIGERATING MACHINERY
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE
WORKING FLUIDS