ABSTRACT

An apparatus was constructed for the measurement of critical parameters and vapor pressure at high temperatures. Its reliability was confirmed with two commercially available chlorofluorocarbons, HFC- 134a (CF3CH2F) and HCFC-142b (CH3CClF2). Measured overall values fell well within the range of other reports. Attempts were made to measure the critical parameters of 21 newly synthesized hydrofluoroethers, that are potentially useful for dry-cleaning and have critical temperatures higher than 450 K. Before the measurements, great care was taken to remove traces of moisture from the samples. Among these new compounds, six were thermally unstable and four were rather unstable even after dehydration. The critical parameters of the remaining 11 were successfully obtained with good reproducibility. Their Antoine and Wagner parameters were also reported.

Compounds

#	Formula	Name
1	C5H3F9O	1,1,1,2,2-pentafluoro-3-(1,1,2,2-tetrafluoroethoxy)propane
2	C5H4F8O	1,1,2,2-tetrafluoro-3-(1,1,2,2-tetrafluoroethoxy)propane
3	C5H5F7O	1,1,1,2,2,3,3-heptafluoro-4-methoxybutane
4	C6H3F11O	1,1,1,2,3,3-hexafluoro-3-(2,2,3,3,3-pentafluoropropoxy)propane
5	C6H4F10O	1,1,1,2,3,3-hexafluoro-3-(2,2,3,3-tetrafluoropropoxy)propane
6	C6H6F8O	1,1,2,2,3,3,4,4-octafluoro-5-methoxypentane
7	C2H2F4	1,1,1,2-tetrafluoroethane
8	C2H3ClF2	1-chloro-1,1-difluoroethane
9	C4H4F6O	1,1,2,2,3,3-hexafluoro-1-methoxypropane
10	C6H5F9O	1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane
11	C3H3F5O	1,1,1-trifluoro-2-(difluoromethoxy)ethane
12	C4H3F7O	2,2,2-trifluoroethyl 1,1,2,2-tetrafluoroethyl ether
13	C4H3F7O	difluoromethyl 2,2,3,3,3-pentafluoropropyl ether
14	C4H4F6O	1,1,1-trifluoro-2-(2,2,2-trifluoroethoxy)ethane
15	C4H4F6O	1,1,2,2-tetrafluoro-2-(2,2-difluoroethoxy)ethane
16	C4H6F4O	1,1,2,2-tetrafluoro-3-methoxypropane
17	C5H3F9O	1,1,1,2,3,3-hexafluoro-3-(2,2,2-trifluoroethoxy)propane

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	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	21
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	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	19
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	3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	23
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	4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	16
POMD	5	Critical pressure, kPa ; Liquid		Liquid Gas	DIRECT:unst	1
POMD	5	Critical temperature, K ; Liquid		Liquid Gas	VISOBSU:unst	1
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:32	23
POMD	6	Critical pressure, kPa ; Liquid		Liquid Gas	DIRECT:unst	1
POMD	6	Critical temperature, K ; Liquid		Liquid Gas	VISOBSU:unst	1
POMD	6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:32	26
POMD	7	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	7	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	7	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	8	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	8	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	8	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	9	Critical pressure, kPa ; Liquid		Liquid Gas	DIRECT:unst	1
POMD	9	Critical temperature, K ; Liquid		Liquid Gas	VISOBSU:unst	1
POMD	9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:16	20
POMD	10	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	10	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	10	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	10	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	13
POMD	11	Critical pressure, kPa ; Liquid		Liquid Gas	DIRECT:unst	1
POMD	11	Critical temperature, K ; Liquid		Liquid Gas	VISOBSU:unst	1
POMD	11	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	18
POMD	12	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	12	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	12	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	12	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	19
POMD	13	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	13	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	13	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	13	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	16
POMD	14	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	14	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	14	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	14	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	24
POMD	15	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	15	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	15	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	15	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	21
POMD	16	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	16	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	16	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	16	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	20
POMD	17	Critical pressure, kPa ; Liquid		Liquid Gas	Direct measurement	1
POMD	17	Critical temperature, K ; Liquid		Liquid Gas	Visual observation in an unstirred cell	1
POMD	17	Critical density, kg/m3 ; Liquid		Liquid Gas	OTHER	1
POMD	17	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:2	19

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

Critical Parameters and Vapor Pressures Measurements of Hydrofluoroethers at High Temperatures

Yasumoto, M.[Masahiko], Yamada, Y.[Yasufu], Murata, J.[Junji], Urata, S.[Shingo], Otake, K.[Katsuto]

ABSTRACT