Separation of close-boiling components by gas-liquid chromatography

By gas-liquid chromatography, three close-boiling components (dichloromethane, diethylether, and dimethoxymethane) were separated with dinonylphthalate-coated Chromosorb A as a stationary liquid phase and helium as an eluant. Partition coefficients for the materials were measured experimentally with varying column temperatures. The effect of superficial velocity of eluant on the axial dispersion coefficient was correlated by Fourier analysis of response curves as The diffusion coefficient in the pore spacing, was also obtained for each component. Based on the parameters estimated, the effects of superficial velocity of eluant and column length on resolution were investigated through comparisons between calculated and experimental values. As superficial velocity of eluant and column length were increased, the pressure drop through the column was affected considerably on the variation of the velocity.