ABSTRACT

High pressure experimental data are presented on the phase behavior of 2,2-dimethyl-1,3-propanediol in carbon dioxide. Pressure-composition (P-x) isotherms were measured from 352.3 K to 403.2 K. The single phase of the mixture greatly reduces with decreasing temperature due to the hydrogen bonding of 2,2- dimethyl-1,3-propanediol. The P-x isotherms at 352.3 K and 353.3 K exhibited an open loop whereas the P-x isotherms at the higher temperatures did a closed loop. The 2,2-dimethyl-1,3-propanediol + CO2 phase behavior was modeled with Peng-Robinson equation of state with two mixture parameters. A reasonable fit of the high temperature isotherms is obtained if kij is allowed to increase with decreasing temperature. The fit of the data becomes inaccurate with deceasing temperature due to the hydrogen bonding between 2,2-dimethyl-1,3-propanediol molecules.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C5H12O2	2,2-dimethyl-1,3-propanediol

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 2	Critical pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	DIRECT:UFactor:8	9
POMD	1 2	Critical temperature, K ; Liquid	Mole fraction - 2; Liquid	Liquid Gas	Visual observation in a stirred cell	9
POMD	1 2	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid	Liquid Gas	CCELL:UFactor:8	56
POMD	1 2	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 2; Gas Temperature, K; Gas	Gas Liquid	CCELL:UFactor:8	49

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

Phase Behavior of 2,2-Dimethyl-1,3-propanediol in Carbon Dioxide Kyung-Kyu

Park, K.-K.[Kyung-Kyu], Han, S.-H.[Sang-Hun], Lee, S.-H.[Sang-Ho]

ABSTRACT