Graphical stage calculation for binary distillation.
The graphical method for binary distillation plots equilibrium curve, operating lines for rectifying and stripping sections and feed line (q-line), then steps off theoretical stages between curves. Gives stage count and optimum feed stage for a specified reflux.
Stepping stages shows a column needs 12 theoretical plates at R=1.5R_min.
The McCabe-Thiele method gives a graphical way to count stages in a binary distillation, which is useful for quick design.
Graphical stage calculation for binary distillation.
The McCabe-Thiele method gives a graphical way to count stages in a binary distillation, which is useful for quick design.
The mass balance relations between the liquid and vapour compositions in the rectifying and stripping sections of the column.
It shows how the feed condition, such as liquid, vapour or mixed, changes the balance between the two sections.
Typical applications include estimating the number of trays needed to separate methanol from water, checking the reflux ratio for a column with a given feed composition and comparing the stage count at different operating pressures.
Study "Distillation" first (topic 72 of 100 in Materials & Chemical). It covers the groundwork this topic builds on.
x-y diagram. q-line slope. Total reflux Nmin by Fenske.
Stepping stages shows a column needs 12 theoretical plates at R=1.5R_min.
The next topic is "Absorption and stripping", which builds directly on this one.
It is classed as Advanced in Materials & Chemical (topic 73 of 100). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Materials & Chemical.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.