Supercritical Fluid Effect on the Rates
of Elementary Bimolecular Reactions

A. B. Rabinovich and Yu. K. Tovbin

Karpov Institute of Physical Chemistry, Moscow, 105064 Russia

e-mail: tovbin@cc.nifhi.ac.ru

Received February 26, 2010

Abstract—The effect of the supercritical fluid (SCF) present in the reaction system on the rate of a bimolecular
reaction has been investigated theoretically. Calculations have been carried out in the framework of the theory
of nonideal reaction rates in condensed phases. The intermolecular interactions of the nearest neighbors are
described in the quasi-chemical approximation taking into account the short-order correlation effects. The com-
peting effects of raising the reaction temperature (which increases the reaction rate) and raising the pressure by
increasing the amount of SCF (which hinders the meeting of the reactants) are discussed. Increasing the pro-
portion of SCF reduces the self-diffusion coefficient and increases the viscosity of the reaction mixture.

DOI: 10.1134/S0023158411040148

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