The number of stages nis the number oftie lines plotted.Third case.It is desired to determine the number of stages n when theamount of feed RA and its composition XSRA are known, as well as thecomposition XSRnof the final under flow, and the total amount of solvent DTto use and its composition YSD.The way to solve the problem is to assume a number of stages n, whichwill determine the amount of solvent to use in each stage (Di= DT/n). Next,the number of equilibrium stages is obtained as in the second case. If thisnumber of stages coincides with the number assumed, then the problem issolved. On the other hand, another value of n should be assumed and thecalculation procedure repeated until the number of stages assumed coincideswith the calculated number.Until now, only the calculation method using the triangular diagram hasbeen presented; however, the rectangular diagram with coordinates free ofinert solids could also be used. In this diagram, the operation is analogousto that explained for the triangular diagram. The mass balances for a stage iare:
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