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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