| In this paper, emulsion liquid membrane separation technology was applied to treat waste gas loaded with toluene. Research was focused on three aspects, the study on the stability of emulsion liquid membrane; the absorption of stimulated waste gas in emulsion liquid membrane and the gas-liquid mass transfer.A series of pilots were executed to determined the optimistic parameters ,which included the oil phase, surfactant, stirring speed and oil-water ratio, for the preparation of emulsion liquid membrane which would be used as the absorbent for the absorption of the stimulated gas. Experiment data showed that the master factors affecting emulsion stability lied in the choice of oil phase, oil-water ratio and surfactant nature and concentration of the system while the stirring speed had no significant impact on the stability of the system. Absorption of the waste gas by emulsion liquid membrane prepared as the optimal parameters was studied to define impacts of the operating factors included the concentration of surfactants, the oil-water ratio, the stirring speed and the temperature, and the gas-liquid mass transfer coefficient and also the corresponding mass transfer resistance were calculated.Emulsion absorption efficiency was much higher than water, absorption efficiency lower than the kerosene absorption efficiency, but compared to kerosene, the consumption of kerosene emulsion was only one-third of kerosene absorption. The critical factor for the absorption was the temperature, followed by the surfactant concentration and simulated exhaust gas inlet concentration. The oil-water ratio presented little impact to the absorption.The impact on the absorption of oil-water ratio was relatively small. The most influential factors for gas-liquid mass transfer coefficient was the temperature, followed by the concentration of surfactant, within the experiment scope, liquid-phase stirring speed process with minimal impact on the mass transfer. |
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