This paper reports on the determination of the intrinsic kinetics in biphasic recognition chiral extraction of phenylsuccinic acid enantiomers (H 2 A) by L-IBTA and HP-b-CD in a modified Lewis cell. The two-phase homogeneous reaction model was selected, because there is a finite physical solubility of phenylsuccinic acid enantiomers in both the aqueous phase and the organic phase. The regime analysis was split up in three parts: a regime analysis on the aqueous phase reaction in the absence of organic phase reaction, a regime analysis of the organic phase reaction in the absence of the aqueous phase reaction, and a regime analysis of reactions in both phases. The reactions have been found to be first order with respect to H 2 A and second order with respect to L-IBTA and HP-b-CD. Competitive extraction of H 2 A enantiomers with HP-b-CD and L-IBTA has great influence on the extraction process. With increase of HP-b-CD concentration, high enantioselectivity was obtained, but the extraction rate decreases.