Can you elaborate on what your notation stands for? What I'd guess is that xd and xb are the mole fractions of the more volatile component in the liquid phase in the distillate and residue, while xf is the mole fraction in the feed. To start solving for this (ie, find the number of stages or trays), you need the H-x-y diagram.If you were to design a distil col and didn't know the feed conditions how would you go about starting. You know xd, xb, xf, R, Eq data.
q as in q-line?Theres 5 potential q's.
Usually one constructs the enthalpy diagram as follows from the VLE data, Heat capacities of liquid, Latent heat of vapourization and Heat of solution. The VLE data for most systems can be easily found (for ex, Perry's handbook)Also how would u make enthpy diagram for PS.