Single-stage systems \((\mathrm{N}=1)\) can be solved as countercurrent systems, Figure 13-4, or as crossflow systems, Figure 13-9. Develop the methods for both these designs. Which is easier? If the system is dilute, how can the Kremser equation be used?

Figure 13-4

A X = 0.012 R = 100 1 B RE y = 0.01649 = 1.35 y,E=74 0.018 y 0.016 E IR 0.014 0.012 Ys2 = 0.004 4. 3 E RE = 30 0.010 0.008 0.006 198 563 0.004 14, Ys2 1312-Optimum feed YN+1=0 E = 44 0.002 15 16 R 2.273 YN+1 = 0 .4 1 N XN = 0.001 0 0.002 0.004 0.006 0.008 0.010 0.012 XN Xo X