is convenient for stepping off stages at extreme purities if it is plotted on log-log paper. The equilibrium curve at very low x1 values on ordinary graph paper can usually be assumed to be a straight line with an intercept term of zero which can be expressed as y = (y/x)x + 0.0
where the slope y/x is a constant. The necessity for knowing the slope is eliminated by taking the logarithm of both sides log y = log x + log (y/x)
and plotting y versus x on a log-log plot to give a straight line with a slope of unity. The slope y/x is now an intercept term which need not be known. One point from the equilibrium curve is sufficient, therefore, to locate the equilibrium curve on the log-log plot. The operating line will be curved on the log-log plot and is located by plotting the appropriate material-balance equation. Both the equilibrium and the operating lines can be extended to any purity desired.
Minimum reflux ratio
Was this article helpful?
At one time or another you must have sent away for something. A