Isotherms and Kinetics Study for Adsorption of Nitrogen from Air using Zeolite Li-LSX to Produce Medical Oxygen


  • Marwa Hussein Mohammed Ali Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq
  • Raghad F. Almilly Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq
  • Riyadh Kamil Abid Petroleum and Petrochemical Research Center, Ministry of Science and Technology (Most), Iraq



Zeolite Li-LSX, medical oxygen, adsorption isotherm, adsorption kinetic, nitrogen adsorption


This research investigates the adsorption isotherm and adsorption kinetics of nitrogen from air using packed bed of Li-LSX zeolite to get medical oxygen. Experiments were carried out to estimate the produced oxygen purity under different operating conditions: input pressure of 0.5 – 2.5 bar, feed flow rate of air of 2 – 10 L.min-1 and packing height of 9-16 cm. The adsorption isotherm was studied at the best conditions of input pressure of 2.5 bar, the height of packing 16 cm, and flow rate 6 Lmin-1 at ambient temperature, at these conditions   the highest purity of oxygen by this system 73.15 vol % of outlet gas was produced. Langmuir isotherm was the best models representing the experimental data., and the model parameters were the maximum monolayer coverage (qm) 200 mg. g-1 and Kl 0.00234 -1. Also, from the Freundlich isotherm model, the sorption intensity (n) indicated favorable sorption of 1.435. The average free energy estimated from the DRK isotherm model was 0.02 KJ.mol-1, which proved the adsorption process to follow physical nature. The results got from experiments showed a coincidence to the pseudo-first-order kinetic model.


R. R. Vemula, M. D. Urich, and M. V. Kothare, “Experimental design of a ‘Snap-on’ and standalone single-bed oxygen concentrator for medical applications,” Adsorption, vol. 27, no. 4, 2021,

A. Arora and M. M. F. Hasan, “Flexible oxygen concentrators for medical applications,” Sci. Rep., vol. 11, no. 1, 2021,

S. Qadir. D.Li, Y .Gu, Yuan, Z. Y .Zhao, S. Wang, S.Wang, “Experimental and Numerical Analysis on the Enhanced Separation Performance of a Medical Oxygen Concentrator through Two-Bed Rapid Pressure Swing Adsorption,” Ind. Eng. Chem. Res., vol. 60, no. 16, 2021,

A. A. Tishin, “Study of Adsorption Properties of Zeolites NaX, CaA, and CaNaA in Separation of Air Components,” Pet. Chem., vol. 60, no. 8, 2020,

X. Yang, F. E. Epiepang, J. Li, Y. Wei, Y. Liu, and R. T. Yang, “Sr-LSX zeolite for air separation,” Chem. Eng. J., vol. 362, 2019,

R.T. Yang, ʻʻGas separation by adsorption processes (Vol. 1),1997. World Scientific.

A. Günay, E. Arslankaya, and I. Tosun, ʻʻLead removal from aqueous solution by natural and pretreated climatariansʼʼ 2007.146(1-2), pp.362-371.

T. M. Elmorsi, “Equilibrium Isotherms and Kinetic Studies of Removal of Methylene Blue Dye by Adsorption onto Miswak Leaves as a Natural Adsorbent,” J. Environ. Prot. (Irvine,. Calif)., vol. 02, no. 06, 2011,

T. M. Albayati, G. M. Alwan, and O. S. Mahdy, “High performance methyl orange capture on magnetic nanoporous MCM-41 prepared by incipient wetness impregnation method,” Korean J. Chem. Eng., vol. 34, no. 1, 2017,

N. Ayawei, A. T. Ekubo, D. Wankasi, and E. D. Dikio, “Adsorption of congo red by Ni/Al-CO3: Equilibrium, thermodynamic and kinetic studies,” Orient. J. Chem., vol. 31, no. 3, 2015,

S. K. Lagergren, “About the theory of so-called adsorption of soluble substances,” Sven. Vetenskapsakad. Handingarl, vol. 24, 1898.

Q. Hu and Z. Zhang, “Application of Dubinin–Radushkevich isotherm model at the solid/solution interface: A theoretical analysis,” J. Mol. Liq., vol. 277, 2019,

S. Sen Gupta and K. G. Bhattacharyya, “Kinetics of adsorption of metal ions on inorganic materials: A review,” Advances in Colloid and Interface Science, vol. 162, no. 1–2. 2011.

S. S. Shah, I. Ahmad, W. Ahmad, M. Ishaq, K. Gul, R. Khan, H.Khan, “Study on adsorptive capability of acid activated charcoal for desulphurization of model and commercial fuel oil samples,” J. Environ. Chem. Eng., vol. 6, no. 4, 2018,

M. M. Brdar, A. A. Takači, M. B. Šćiban, and D. Z. Rakić, “Isotherms for the adsorption of Cu(II) onto lignin - Comparison of linear and non-linear methods,” Hem. Ind., vol. 66, no. 4, 2012,

D. M. Ruthven and S. Farooq, “Air separation by pressure swing adsorption,” Gas Sep. Purif., vol. 4, no. 3, 1990,

W. J. Weber and J. C. Morris, “Kinetics of Adsorption on Carbon from Solution,” J. Sanit. Eng. Div., vol. 89, no. 2, 1963,

H.marwa , A. Raghed, K. Riyadh, “Methodological approach for optimizing production of oxygen by adsorption of nitrogen from air using zeolite Li-LSX”, International Journal of Chemical Engineering, 2022.




How to Cite

Mohammed Ali, M. H., Almilly, R. F., & Abid, R. K. (2023). Isotherms and Kinetics Study for Adsorption of Nitrogen from Air using Zeolite Li-LSX to Produce Medical Oxygen. Iraqi Journal of Chemical and Petroleum Engineering, 24(2), 81–87.