Vapor Pressure of 2-(Difluoromethoxy)-1,1,1-trifluoroethane CHF2−O−CH2CF3 (HFE-245)

• Published in: Journal of chemical and engineering data Vol. 43; no. 5; pp. 846 - 848
• Main Authors: Goodwin, A. R. H, Defibaugh, D. R, Weber, L. A
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 10.09.1998
• Subjects: Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Exact sciences and technology; General and physical chemistry; Thermodynamic properties; Fluorine Organic compounds; Haloether; Vapor pressure; Experimental study; Thermodynamic properties; Aliphatic compound
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je980056x

The vapor pressure of 2-(difluoromethoxy)-1,1,1-trifluoroethane, a candidate alternative refrigerant that is also known as HFE-245, has been measured. The vapor pressure was determined at temperatures between 261 K and 369 K by two ebulliometric techniques. The differences in these two methods arise from the method used to determine pressure. At p < 200 kPa, a comparative instrument was used and pressures were obtained from the temperature at which water boiled at the same pressure. At pressures up to 747 kPa, the pressures were measured directly. A correlation for the vapor pressure from 261 K to the critical temperature is provided. The comparative ebulliometric measurements have an expanded uncertainty (k = 2) of less than 0.0005·p, while the direct ebulliometric measurements have an expanded uncertainty (k = 2) of 0.002·p.