Simulation of the Combined Continuous and Prepartive Gas-Liquid Chromatographic Separation of Three Close-Boiling Components

초록

Combined continuous and preparative gas-liquid chromatographic system was considered for separating continuously three closed-boiling components, diethylether (DEE), dimethoxymethane(DMM), and dichloromethane(DCM). Their concentration profiles were simulated by the mathematical model, which assumed the uniform distribution of stationary liquid phase and the linearity of the equilibrium isotherm. The operational princiles of the system are that the least-absorbed component of the three components can be obtained purely before the elution of the more-absorbed components if the mixture is continuously injected into the one of the two sections(partition section) and at the same time, in the other section (desorption section), the three components remained in the column can be separated by the adjusting the experimental conditions and the column configuration. If the operations in the two sections continuous separations of the three components are feasible. Effect of the various operating conditions on the resolution is investigated. From the results of the simulations, the resolution is greatly affected by the additional column length in the desorption section and the switching time can be determined by the desorbent velocity.