Influence of Heat Transfer on the Kinetic Process Involved during the Adsorption of Soluble Organic Substances on to Porous Polymeric Sorbents
During adsorption from the gaseous phase on to solid sorbents, it is known that heat transfer generally induces a mass transfer process. The present investigation was concerned with the solution of some questions relating to the heat transfer phenomenon during adsorption from the aqueous phase. In s...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
1999-03-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361749901700303 |
| Summary: | During adsorption from the gaseous phase on to solid sorbents, it is known that heat transfer generally induces a mass transfer process. The present investigation was concerned with the solution of some questions relating to the heat transfer phenomenon during adsorption from the aqueous phase. In so doing, the thermodynamic and kinetic characteristics of the adsorption of benzene derivatives from aqueous solution by polymeric sorbents, i.e. Polysorb 60/100 and sample G-5, have been studied using the method of statistical moments for calculating the heat diffusion contribution to the general mass diffusion process. This method consists of the mathematical analysis of the temperature dependence of the kinetic diffusion curves on the basis of a linear adsorption isotherm. The contribution of the kinetics of heat transfer to the first sum of the moment of the kinetic curve may be defined as: M 1 q / M 1 = M 1 q / ( M 1 D + M 1 q ) where M lq is that part of the first moment which represents heat diffusion and M ID is the diffusion part of the first moment. The results obtained for the different systems investigated show the existence of a heat transfer effect on the kinetic adsorption process. This effect which retards the heat transfer process may be expressed in terms of the final rate of heat dispersion. The external contribution of heat transfer to the general mass transfer has been evaluated as 3–11% for various research systems. It has been shown that the evaluated contribution of the heat transfer is larger during adsorption by hydrophilic polymeric sorbents than when hydrophobic ones are employed. This fact may be connected with the different chemical composition and density of the sorbents. |
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| ISSN: | 0263-6174 2048-4038 |