In the process of analyzing a large amount of dynamic adsorption data for hydrocarbons a number of existing mathematical models have been used. Even though many of these can be used to "fit" the data to varying degrees, they involve assumptions that are incompatible with the proved physical mechanisms involved and/or are incapable of describing the concurrent adsorption of several adsorbates. Therefore, the ability of a model to fit the data has only empirical significance. Data are presented which illustrate

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