### Abstract

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.

Original language | English |
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Journal | J. Chromatography A |

Volume | 827 |

Pages (from-to) | 235-239 |

Publication status | Published - 1998 |

## Cite this

Mollerup, J., & Hansen, E. (1998). Overall mass-transfer coefficients in non-linear chromatography.

*J. Chromatography A*,*827*, 235-239.