EQUILIBRIUM-THEORY REVISITED - ISOTHERMAL FIXED-BED SORPTION OF BINARY-SYSTEMS .3. SOLUTES WITH TYPE-I, TYPE-II AND TYPE-IV PARENT ISOTHERMS - PHASE-SEPARATION PHENOMENA

The authors analyse the isothermal equilibrium sorption of two solutes with Type I, II and IV parent isotherms, with particular reference to conditions which may lead to phase separation (condensation/precipitation). The study begins with a general survey of displacement operations based on concepts developed previously. A displacement effectiveness scale is developed in terms of single solute isotherm shape and location of the watershed point, determined by drawing a tangent to the origin of the light component isotherm. Effectiveness is judged by the concentration range over which the displacement agent is active, and the degree of desorbate enrichment (roll-up) obtained.