The state of a continuous process when it is operating in such a way that the concentration
of solutes in exit streams remains constant with respect to time for constant feed
concentrations, even though the two phases are not necessarily in thermodynamic equilibrium
in any part of the process. The term equilibrium should not be used to describe this
situation.
Source:
PAC, 1993, 65, 2373
(Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations
1993))
on page 2390