An empirical method has been proposed to correlate the reaction rate constants in mixed liquid solvents based on the Arrhenius equation. A Redlich-Kister type excess function is introduced to obtain the excess activation energy in the mixed solvent. The rate constants for isoprenemaleic anhydride reaction in dilute solution of the hexane + nitrobenzene mixture previously reported was examined. It is found that the present model can correlated the reaction rate constants with a good agreement.