The correlations between thermodynamic and kinetic parameters in the extraction of tobacco leaves(solid-liquid system)were determined.The values of the parameters internal molecular diffusion coefficient,activation energy and entropy were used in the calculation procedure presented in the study,with regard to the extraction process of leaves of three types of tobacco(Virginia,Burley and Oriental),carried out with 50% ethanol as a solvent at different temperatures(20,30,40,50,60 and 70°C)and duration(10,20,30,40,50 and 60 min).On the basis of the Arrhenius law the effective diffusion coefficient in solid-liquid system and the reaction rate constant of the three types of tobacco were computed.
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