Table 2.

A comparison of operation pressures required for MBPM and MLLDP (20 °C, cos θ = 1).

Method	System	Interfacial Tension (mN/m)	Pressure (MPa) Corresponding to Different Pore Diameters (μm)
			0.2	0.1	0.05	0.025
MBPM	water–nitrogen	72.8	1.45	2.91	5.82	11.64
	ethanol–nitrogen	22.39	0.44	0.89	1.79	3.58
MLLDP	n-amyl alcohol a/water	4.8	0.096	0.19	0.38	0.76
	isobutyl alcohol a/water	1.7	0.034	0.068	0.13	0.27
	oil–aqueous phase b/water	0.35	0.007	0.014	0.028	0.056

^a n-amyl alcohol and isobutyl alcohol are saturated with water at a volumetric proportion of 1:1; ^b oil–aqueous phase is prepared using isobutyl alcohol, methanol, and water at a volumetric proportion of 15:7:25.