Abstract
The study on the kinetics of reactive extraction of rosmarinic acid with two extractants, Amberlite LA-2 and D2EHPA,
underlined the strong influence of extractant type, solvent polarity, and 1-octanol content on the relative magnitude of the
diffusional or kinetic resistances and on the interfacial reaction rate. Thus, indifferent of the extractant type, the highest values of
interfacial mass flows and reaction rates have been reached for extraction in dichloromethane. The addition of 1-octanol in the
solvent phase led to the increase up to two times of the interfacial reaction rates only for the reactive extraction with Amberlite
LA-2. This effect is amplified by reducing the solvent dielectric constant. In the case of extraction with D2EHPA, the rate of the
interfacial reaction is not modified in presence of 1-octanol. The values of interfacial reactions rates between the rosmarinic acid
and the two extractants calculated with the proposed kinetic equations are in concordance with the experimental results, the
standard deviations varying between 5.03% for reactive extraction with D2EHPA and 5.76% for extraction with Amberlite
LA-2.