ABSTRACT

Trifluoromethoxymethane (CF3OCH3, HFE-143m) is a promising alternative for dichlorodifluoromethane (CCl2F2, CFC-12) as a refrigerant. Because of its low flammability, it is expected to be used in binary mixtures with inflammable hydrofluorocarbons (HFCs). In this study, we measured the critical parameters of binary mixtures of HFE-143m with four HFCs-pentafluoroethane (CHF2CF3, HFC-125), 1,1,1,2-tetrafluoroethane (CH2FCF3, HFC-134a), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), and 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea). The uncertainties were +/-10 mK in temperature, +/-0.5 kPa in pressure, +/-1 kg m-3 in density, and +/-0.5% in composition (molar base). The HFCs were selected for the similarities of their normal boiling points. The experimental data were correlated with equations proposed by Higashi.

Compounds

#	Formula	Name
1	C2H3F3O	trifluoromethoxymethane
2	C2HF5	pentafluoroethane
3	C2H2F4	1,1,1,2-tetrafluoroethane
4	C3HF7	1,1,1,2,3,3,3-heptafluoropropane
5	C3H2F6	1,1,1,2,3,3-hexafluoropropane

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	1	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	1	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	2	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	2	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	2	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	3	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	3	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	3	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	4	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	4	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	4	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	5	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	5	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	5	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	2 1	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Direct measurement	7
POMD	2 1	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Visual observation in an unstirred cell	7
POMD	2 1	Critical density, kg/m3 ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	OTHER	7
POMD	1 3	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Direct measurement	7
POMD	1 3	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Visual observation in an unstirred cell	7
POMD	1 3	Critical density, kg/m3 ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	OTHER	7
POMD	1 4	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Direct measurement	7
POMD	1 4	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Visual observation in an unstirred cell	7
POMD	1 4	Critical density, kg/m3 ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	OTHER	7
POMD	1 5	Critical pressure, kPa ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Direct measurement	7
POMD	1 5	Critical temperature, K ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Visual observation in an unstirred cell	7
POMD	1 5	Critical density, kg/m3 ; Liquid	Mole fraction - 1; Liquid	Liquid Gas	OTHER	7

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Critical Properties of Four HFE + HFC Binary Systems: Trifluoromethoxymethane (HFE-143m) + Pentafluoroethane (HFC-125), + 1,1,1,2-Tetrafluoroethane (HFC-134a), + 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea), and + 1,1,1,2,3,3-Hexafluoropropane (HFC-236ea)

Uchida, Y.[Yuko], Yasumoto, M.[Masahiko], Yamada, Y.[Yasufu], Ochi, K.[Kenji], Furuya, T.[Takeshi], Otake, K.[Katsuto]

ABSTRACT