Table 5.

Critical properties of some pure components used in SFE (Sahena et al., 2009; Silva et al., 2016).

Component	Critical property
	Temperature (°C)	Pressure (MPa)	Density (g/cm3)
Ethylene (C2H4)	9.4	5.04	0.215
Carbon dioxide (CO2)	31.1	7.38	0.470
Ethane (C2H6)	32.4	4.82	0.203
Nitrous oxide (N2O)	36.7	7.17	0.460
Sulfur hexafluoride	45.8	3.77	0.730
Propylene (C3H6)	91.9	4.60	0.232
Propane (C3H8)	96.8	4.25	0.217
Freon-134a (CH2FCF3)	101.1	4.06	0.512
Freon-12 (CCl2F2)	111.9	4.14	0.565
Acetone (C3H6O)	235.1	4.70	0.278
Methanol (CH3OH)	239.6	8.09	0.272
Ethanol (C5H5OH)	240.9	6.14	0.276
Ethyl acetate (C4H8O2)	250.2	3.83	0.360
Water (H2O)	374.1	22.06	0.322