Critical Parameters and Normal Boiling Temperatures of Five Fluorinated Ethers and Two Fluorinated Ketones

• Published in: Journal of chemical and engineering data 2001-09, Vol.46 (5), p.1078-1081
• Main Authors: Sako, Takeshi, Yasumoto, Masahiko, Nakazawa, Noriaki, Kamizawa, Chiyoshi
• Format: Article
• Language: English
• Subjects: Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Exact sciences and technology; General and physical chemistry; Thermodynamic properties
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je000249w

The critical parameters and normal boiling temperatures of five fluorinated ethers (1,1,1,2,4,4,4-heptafluoroisobutyl trifluoromethyl ether, tert-perfluorobutyl methyl ether, 1,1,1,2-tetrafluoro-2-difluoromethoxyethyl difluoromethyl ether, 2,3,3,5,5,6,6-heptafluoro-1,4-dioxane, and 2-trifluoromethyl-4,4,5,5-tetrafluoro-1,3-dioxolane) and two fluorinated ketones (1,1,1,2,2-pentafluoro-3-butanone and 1,1,1,2-tetrafluoro-2-trifluoromethyl-3-butanone) were measured using static-type apparatuses, in which a small amount of a sample fluid of 5 cm3 was required to determine the thermodynamic properties accurately. The uncertainties in the critical parameters were ±30 mK in temperature, ±2 kPa in pressure, ±0.2% in density, and ±10 mK in normal boiling temperature, respectively. Lydersen's group contribution method estimated the critical parameters fairly well, but no group contribution method could predict the normal boiling temperature reasonably.