Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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Results concerning the thermodynamics and kinetics of separation of some saturated hydrocarbons on a DB-1 non-polar capillary chromatographic column are presented. The effect of temperature on the retention time at constant carrier gas flow was studied in order to determine the adsorption enthalpy and adsorption entropy of the compounds on the poly-dimethyl-siloxane stationary phase. The dependence of the height equivalent to theoretical plate on the carrier gas linear velocities at constant temperature was also determined in order to have access to the optimal linear velocity, the longitudinal diffusion (B) and resistance to mass transfer (C) coefficients. These terms can be determined from the Golay equation. The linearization of the Golay equation is also presented.

Keywords: gas chromatography, DB-1 capillary column, hydrocarbon isomer separation, adsorption enthalpy, adsorption entropy, Golay equation, longitudinal diffusion coefficient, resistance to mass transfer coefficient.