1Advanced Control Research Laboratory, School of Chemical Engineering, College of Engineering, University of Tehran, PO Box 11365-4563, Tehran, Iran
2Faculty of Fouman, College of Engineering, University of Tehran, PO Box 43515-1155, Fouman, Iran
3Oil and Gas Center of Excellence, University of Tehran, Tehran, Iran
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We have noticed some errors in the equations presented in [J. Ind. Eng. Chem. 17 (4) (2011) 667.674] for calculation of the dimensionless quantities a(T)/VB and b(T)/VB from the Lennard-Jones (12,6) potential.