Review Article

The Production of Industrial-Grade Oxygen from Air by Pressure Swing Adsorption

Table 1

The adsorption isotherms’ parameters of various zeolites for O2/N2 separation fitted using extended Langmuir and extended Langmuir–Freundlich model.

AdsorbentsGas componentReferences
O2N2

Extended Langmuir
LiXk1 = 7.87 × 10−9 mol/kg/Pa
k2 = 1541.211 K
k3 = 6.79 × 10−10 1/Pa
k4 = 1968.24 K
k1 = 9.86 × 10−9 mol/kg/Pa
k2 = 2010.908 K
k3 = 1.67 × 10−10 1/Pa
k4 = 2250 K
Yang et al. [36]
Li94.5Na1.5-Xk1 = 1.14 × 10−6 mol/kg
k2 = 239.2 K
k3 = 2.20 × 10−3 1/atm
k4 = 1092 K
k1 = 1.69 × 10−6 mol/kg
k2 = 134.4 K
k3 = 1.19 × 10−3 1/atm
k4 = 1990 K
Hutson et al. [37]
Li94.2Na0.7Ag1.1-Xk1 = 0.965 × 10−6 mol/kg
k2 = 196 K
k3 = 2.25 × 10−3 1/atm
k4 = 1212 K
k1 = 2.12 × 10−6 mol/kg
k2 = 64.82 K
k3 = 7.78 × 10−3 1/atm
k4 = 1494 K

Extended Langmuir–Freundlich
13Xk1 = 6.705 × 10−3 mol/g
k2 = −1.435 × 10−5 mol/g/K
k3 = 3.253 × 10−4 1/atm
k4 = 1428 K
k5 = −0.3169
k6 = 387.8 K
k1 = 12.52 × 10−3 mol/g
k2 = −1.785 × 10−5 mol/g/K
k3 = 2.154 × 10−4 1/atm
k4 = 2333 K
k5 = 1.666
k6 = −245.2 K
Jee et al. [38]
5Ak1 = 7.252 × 10−3 mol/g
k2 = −1.820 × 10−5 mol/g/K
k3 = 54.19 × 10−4 1/atm
k4 = 662.6 K
k5 = −1.101
k6 = 656.4 K
k1 = 6.21 × 10−3 mol/g
k2 = −1.27 × 10−5 mol/g/K
k3 = 1.986 × 10−4 1/atm
k4 = 1970 K
k5 = 2.266
k6 = −396.5 K
Jee et al. [39]
Li-LSXk1 = 0.4789 × 10−3 mol/g
k2 = 636.6 K
k3 = 94.8 × 10−4 1/atm
k4 = 500 K
k5 = 1.08168
k1 = 1.84559 × 10−3 mol/g
k2 = 139.68 K
k3 = 2.19 × 10−4 1/atm
k4 = 2484.2 K
k5 = 1.033
Epiepang et al. [40]
Ca-LSXk1 = 0.01448 × 10−3 mol/g
k2 = 1385.97 K
k3 = 1278.8 × 10−4 1/atm
k4 = 207.35 K
k5 = 1.152
k1 = 0.2623 × 10−3 mol/g
k2 = 646.75 K
k3 = 0.688 × 10−4 1/atm
k4 = 3785.11 K
k5 = 0.931
Li2.5Ca46.75-LSXk1 = 1.89933 × 10−3 mol/g
k2 = 145.55 K
k3 = 6.20294 × 10−4 1/atm
k4 = 1609.13 K
k5 = 1.021
k1 = 1.31846 × 10−3 mol/g
k2 = 104.23 K
k3 = 0.19726 × 10−4 1/atm
k4 = 3489.63 K
k5 = 0.958
Li4.2Ca45.9-LSXk1 = 2.20255 × 10−3 mol/g
k2 = 179.35 K
k3 = 4.02105 × 10−4 1/atm k4 = 1525.38 K
k5 = 0.992
k1 = 0.98863 × 10−3 mol/g
k2 = 149.34 K
k3 = 0.467445 × 10−4 1/atm
k4 = 3243.35 K
k5 = 0.999

The expression of the extended Langmuir is slightly different. This may refer to the original work cited.