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Table 2 Hansen solubility parameters for various solvents and the calculated PEI-solvent distance [17]

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

Compound δh (MPa)1/2 δd (MPa)1/2 δp (MPa)1/2 δ(solventPEI) (MPa)1/2
Polyetherimide (PEI) 6.4 17.7 6.0
n-Methylpyrrolidone (NMP) 7.2 18.4 12.3 6.39
Methyl l-lactate (ML) 10.2 15.8 6.5 4.28
Ethyl lactate (EL) 12.5 16.0 7.6 6.53
Propylene carbonate (PC) 4.1 20.0 18.0 12.43
Tributyl o-acetylcitrate (ATBC) 6.2 15.4 4.1 2.99
Tributyl citrate (TBC) 10.1 16.6 3.8 4.44
Triethyl phosphate (TEP) 9.2 16.8 11.5 6.24
γ-Butyrolactone (γ-BL) 7.4 19.0 16.6 10.73