ABSTRACT

Isopleths and solution densities are reported, from _ 25 to 100 C and pressures to _ 200 bar, for mixtures of CO2 with pyrazine, 2-methoxypyrazine, 2-acetylpyrazine, 2-methylpyrazine, and 2,3-dimethylpyrazine. These five solute + CO2 systems exhibit type-I phase behavior with similar mixture critical pressures up to 100 C. The Peng-Robinson equation of state, with kij equal to zero, provides a semi-quantitative representation of the data for all of the pyrazines with the exception of the 2-acetylpyrazine + CO2 system, which required a kij of -0.100 to get a reasonable representation of the data. The data presented here further substantiates the observation that supercritical CO2 can be used to extract pyrazines from natural materials.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C4H4N2	pyrazine
3	C5H6N2	2-methylpyrazine
4	C6H8N2	2,3-dimethylpyrazine
5	C5H6N2O	methoxypyrazine
6	C6H6N2O	2-acetylpyrazine

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	Mole fraction - 2; Liquid	Liquid Gas	Direct measurement	4
POMD	1 2	Critical temperature, K ; Liquid	Mole fraction - 2; Liquid	Liquid Gas	Visual observation in an unstirred cell	4
POMD	1 2	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 2; Gas Temperature, K; Gas	Gas Liquid	Closed cell (Static) method	5
POMD	1 2	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	60
POMD	1 2	Mass density, kg/m3 ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid	Liquid Gas	linear displacement	59
POMD	1 2	Mass density, kg/m3 ; Gas	Mole fraction - 2; Gas Temperature, K; Gas	Gas Liquid	linear displacement	5
POMD	1 2	Mass density, kg/m3 ; Fluid (supercritical or subcritical phases)	Mole fraction - 2; Fluid (supercritical or subcritical phases) Temperature, K; Fluid (supercritical or subcritical phases) Pressure, kPa; Fluid (supercritical or subcritical phases)	Fluid (supercritical or subcritical phases)	Linear displacement technique	182
POMD	1 5	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 5; Gas Temperature, K; Gas	Gas Liquid	Closed cell (Static) method	16
POMD	1 5	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 5; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	45
POMD	1 5	Mass density, kg/m3 ; Liquid	Mole fraction - 5; Liquid Temperature, K; Liquid	Liquid Gas	linear displacement	45
POMD	1 5	Mass density, kg/m3 ; Gas	Mole fraction - 5; Gas Temperature, K; Gas	Gas Liquid	linear displacement	16
POMD	1 6	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 6; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	39
POMD	1 6	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 6; Gas Temperature, K; Gas	Gas Liquid	Closed cell (Static) method	12
POMD	1 6	Mass density, kg/m3 ; Liquid	Mole fraction - 6; Liquid Temperature, K; Liquid	Liquid Gas	linear displacement	39
POMD	1 6	Mass density, kg/m3 ; Gas	Mole fraction - 6; Gas Temperature, K; Gas	Gas Liquid	linear displacement	12
POMD	3 1	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	66
POMD	3 1	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 3; Gas Temperature, K; Gas	Gas Liquid	Closed cell (Static) method	13
POMD	3 1	Mass density, kg/m3 ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid	Liquid Gas	linear displacement	62
POMD	3 1	Mass density, kg/m3 ; Gas	Mole fraction - 3; Gas Temperature, K; Gas	Gas Liquid	linear displacement	12
POMD	3 1	Mass density, kg/m3 ; Fluid (supercritical or subcritical phases)	Mole fraction - 3; Fluid (supercritical or subcritical phases) Temperature, K; Fluid (supercritical or subcritical phases) Pressure, kPa; Fluid (supercritical or subcritical phases)	Fluid (supercritical or subcritical phases)	Linear displacement technique	256
POMD	1 4	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Liquid Gas	Closed cell (Static) method	67
POMD	1 4	Vapor or sublimation pressure, kPa ; Gas	Mole fraction - 4; Gas Temperature, K; Gas	Gas Liquid	Closed cell (Static) method	10
POMD	1 4	Mass density, kg/m3 ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Liquid Gas	linear displacement	67
POMD	1 4	Mass density, kg/m3 ; Gas	Mole fraction - 4; Gas Temperature, K; Gas	Gas Liquid	linear displacement	10
POMD	1 4	Mass density, kg/m3 ; Fluid (supercritical or subcritical phases)	Mole fraction - 4; Fluid (supercritical or subcritical phases) Temperature, K; Fluid (supercritical or subcritical phases) Pressure, kPa; Fluid (supercritical or subcritical phases)	Fluid (supercritical or subcritical phases)	Linear displacement technique	244

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

Solubility of Pyrazine and Its Derivatives in Supercritical Carbon Dioxide

Shen, Z.[Zhihao], Li, D.[Dan], McHugh, M. A.[Mark A.]

ABSTRACT