Collect. Czech. Chem. Commun. 1989, 54, 2141-2147

Description of the equilibrium single-stage extraction from a flowing raffinate into a batch of extraction solvent

Bohuslav Doležal and Karel Ledvinka

Department of Analytical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


Relations are derived for calculating the trace concentration of investigated component contained in a real fluid extracted in a flow set-up with one stirred batch of extraction solvent dosaged. The presented method of derivation stems from the assumptions of sufficient stirring and the rapid establishment of thermodynamic equilibrium in the defined system of constant volume, containing one batch of extraction solvent through which flows continuously the raffinate containing the constant trace concentration of extracted component. The relations derived describe both the mutual limited miscibility of the liquids involved and the excess mixing effects.