Solvent Extraction 357 solvent is determined. with M in the two-phase zone, the overall mixture M separates along a tie line to end points Ye and Xr on the equilibrium curve The relative quantities ofeach phase can be calculated using the inverse lever- arm rule Feed Liquor Figure 9 Graphical solution for single contact with temary equilibrium data with more than one contact, an operating point Q is located outside the temary diagram, as shown in Fig. 10. With a specified solvent/feed ratio and a desired raffinate purity, X,, with the given feed, Xp the composition of the final extract, In, is fixed by material balance. Point Q is formed by the intersection of the line drawn from I, through XF, with the line drawn from the fresh solvent Is through X, Figure 10. Graphical solution for multiple contact Point M in Fig 9 represented the material balance F+S=E+R=MSolvent Extraction 357 solvent is determined. WithMin the two-phase zone, the overall mixturekt separates along a tie line to end points YE andXR on the equilibrium curve. The relative quantities ofeach phase can be calculated using the inverse lever￾arm rule. Figure 9. Graphical soh Solvent Fad Liqwr ion for single contact with ternary equilibrium & 8. With more than one contact, an operating point Q is located outside the ternary diagram, as shown in Fig. 10. With a specified solvent/feed ratio and a desired rafiate purity, XI, with the given feed, X, the composition of the final extract, Y,,, is fixed by material balance. Point Q is formed by the intersection of the line drawn from Y,, through X,, with the line drawn from the fresh solvent Y, through XI , Figure 10. Graphical solution for multiple contact. Point M in Fig. 9 represented the material balance: F+S=E+R=M