An engineering model for adsorption of gases onto flat surfaces and clustering in supercritical fluids
- Michigan State Univ., East Lansing, MI (United States). Dept. of Chemical Engineering
Physical adsorption is used in gas purification processes such as the removal of volatile organic compounds from stack gases, as a means of fractionating fluids that are difficult to separate by other methods, and in adsorbent regenerations using supercritical fluids. Physical adsorption is also of interest in transportation and storage of radioactive gases, in separation and purification of lower hydrocarbons, in supercritical extractions and chromatography, and in critical point drying. The authors present an engineering model to describe physical adsorption from sub- to supercritical conditions on flat walls and clustering in supercritical fluids using a single temperature-independent parameter for fluid-solid interactions. The fluid-solid potential is superimposed on the Peng-Robinson equation of state, and the configurational energy integral in the inhomogeneous fluid phase is simplified with a local density approximation. This model is capable of quantitative fits over wide pressure and temperature ranges. Model predictions for physical adsorption of pure gases on flat walls are compared with experimental surface excess data, and model predictions for describing the clustering phenomenon are compared with experimental fluorescence spectra.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 183121
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 34, Issue 11; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
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