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Table 1 Physical properties and cost of non-toxic solvents [15, 16]

From: Preparation of polyetherimide membrane from non-toxic solvents for the separation of hydrogen from methane

Solvent Density (g/cm3) Boiling point (°C) Estimated price ($/ton)
n-Methylpyrrolidone (NMP) 1.03 202 2700
Methyl l-lactate (ML) 1.09 145 2250
Ethyl lactate (EL) 1.03 154 1200
Propylene carbonate (PC) 1.20 242 1400
Tributyl o-acetylcitrate (ATBC) 1.05 331 2050
Tributyl citrate (TBC) 1.04 170 1700
Triethyl phosphate (TEP) 1.07 215 2050
γ-Butyrolactone (γ-BL) 1.13 204 1600