Journal article
Overall mass-transfer coefficients in non-linear chromatography
In case of mass transfer where concentration differences in both phases must be taken into account, one may define an over-all mass-transfer coefficient basd on the apparent over-all concentration difference. If the equilibrium relationship is linear, i.e. in cases where a Henry´s law relationship can be applied, the over-all mass-transfer coefficient will be concentration independent.
However, in mass-transfer operations, a linear equilibrium relationship is in most cases not a valid approximation wherefore the over-all mass-transfer coefficient becomes strongly concentration dependent as shown in this paper. In this case one has to discard the use of over-all mass-transfer coefficients and calculate the rate of mass transfer from the two film theory using the appropriate non-linear relationship to calculate the equilibrium ratio at the interface between the two films.
Language: | English |
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Year: | 1998 |
Pages: | 235-239 |
ISSN: | 18733778 and 00219673 |
Types: | Journal article |
DOI: | 10.1016/S0021-9673(98)00769-9 |