2.6.2. Graphical multistage calculations by the McCabe-Thiele
method
Multistage gas extraction can be analyzed graphically in a manner
analogous to distillation, using the concept of solvent-free
basis, as the material balance must take into account at least two
components in the feed and the solvent. In this since, the assumptions
of isothermal–isobaric process, constant molar overflow and
complete regeneration of the solvent are applied. Application of
McCabe-Thiele method involves only the solution of equilibrium
relationship and material balance equations for the light pseudocomponent
of multi-component liquid mixture as follows.