Abstract
Adsorption and desorption of acetone and ethyl acetate (two typical oxygenated VOCs) on silica gel have been systematically studied by vacuum swing adsorption (VSA) combined with temperature swing adsorption (TSA) process. It is found that the adsorption of both the oxygenated VOC compounds on silica gel could be well described by the Langmuir-Freundlich model. Although highly dependent on the operational parameters, the adsorption of both the oxygenated VOC compounds on silica gel is found to be controlled by external diffusion. When the two compounds are mixed, the adsorbed acetone is found to be partially replaced by the ethyl acetate when the adsorption approaches the saturation due to the stronger affinity of ethyl acetate to silica gel. It also suggests that there is a competitive adsorption between ethyl acetate and acetone. Further modeling demonstrates that the whole kinetic adsorption of binary oxygenated components could be divided into three steps: the free adsorption, the competitive adsorption and the equilibrium state. The final ratio of adsorbed acetone to ethyl acetate on silica gel is dependent on the adsorption bed height. The adsorbed oxygenated VOCs on silica gel are observed to be desorbed by vacuum pumping, which is also found to be significantly enhanced by increasing temperature (by ∼30 °C), achieving over 2.5 times of concentration increase in the desorbed gas stream.
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