Continuous, regenerative, two-dimensional extraction. 1. Experimentation and computer simulation

Continuous, regenerative, two-dimensional extraction. 2. Theory

“…Closer examination of the form of this self-preserving profile, i.e., elt from eq 9 shows agreement with the computer predictions (Nataraj et al, 1988). The composition is constant along regions of constant a (that is, constant K and D).…”

“…How the parameter switches result in solute separation and solvent self-regeneration was qualitatively explained earlier (Wankat et al, 1976; Nataraj et al, 1988) The theory which follows will quantify these effects. The theory (not the process) is constrained by the following assumptions: perfect equilibrium stages; complete immiscibility of solvent, S, and diluent, D; steady-state operation; and rectangular cascades with straight, parallel bands.…”

“…It is the object of this paper to develop theoretical frameworks to investigate the properties of such cascades. This is quite distinct from computer modeling the cascade, which was illustrated earlier (Nataraj et al, 1988). Rather, the strategy of this paper is to harness known mathematical methods to gain insight without extensive numerical calculations.…”