What’s the Solvent Used in Subcritical Extraction?

Item	Propane	Butane	Dimethyl Ether	Tetrafluoroethane	Liquid Ammonia
molecular formula	C3H8	C4H10	CH3OCH3	CH2FCF3	NH3
The molecular weight	44	58	46	102	17
Boiling point ℃	-42	-0.5	-24.9	-26.2	-33.4
vapor pressure when 20 ℃ (MPa)	0.83	0.23	0.533	0.6	0.88
Critical temperature ℃	95.7	152.8	127	101.1	132.3
Critical pressure MPa	4.4	3.6	5.32	4.07	11.3
Saturated liquid density kg/L (25 ℃)	0.49	0.57	0.66(20℃)	1.29(0℃)	0.61
Saturated gas density kg/m3 (25 ℃)	20.15	6.18	12.1	14.4(0℃)	0.6
Dielectric constant (25 ℃)	1.69	1.78	5.17	9.51	16.9
Gasification of latent heat KJ/kg (30 ℃)	329	358	393	216	1369
The explosion limit	2.3%～9.5%	1.9%～8.5%	3.5%～27%	Incombustible	16％～25％
Toxicity and LC50 (mg/m3)	micro toxicity	micro toxicity, 680	308000	Non-toxic	1390
Character	Colorless, Odorous	Colorless, Odorous	Colorless, Odorous	Colorless and Odorless	Colorless, has a pungent smell