Adsorption isotherms for low concentrations (25–100 ppm) of 2,2,4-trimethylpentane (TMP) on activated carbon were measured at different temperatures (303, 323, and 348 K). In addition, experimental adsorption isotherms for toluene were measured at a single temperature (298 K) and for a wider range of concentrations (5–35,000 ppm) by use of two different gravimetric methods. Because experimental measurements for TMP at low concentrations are time consuming and expensive, it is important to use accurate predictive models capable of taking into account temperature and concentration. In this work, characteristic potential curves for TMP were predicted on the basis of the Polanyi–Dubinin (P–D) model. The curves for TMP were determined by use of a single toluene adsorption isotherm measured at 298 K. For comparison purposes, characteristic curves for TMP were also predicted by use of experimental data for TMP and adsorption isotherms measured at 303, 323, and 348 K. From the characteristic curves, the adsorption isotherms for TMP were then generated at several temperatures (298, 303, 323, and 348 K). The accuracy of the predicted adsorption isotherms were verified by comparison with experimentally measured TMP isotherms. Although the polarity and size of TMP and toluene are slightly different, and despite the different temperatures of the experiments, the P–D model enabled highly accurate prediction of the amount of TMP adsorbed on activated carbon at different temperatures and concentrations. The Langmuir equation was evaluated and shown to work well when used to make predictions within the experimental concentration and temperature ranges. It provided noticeably different estimates when applied to very low concentrations.
Research on Chemical Intermediates – Springer Journals
Published: Jun 20, 2013
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