QUESTION 1 In distillation column, a mixture of 2 000 kmol/ CH4,4 000 kmol/hr of C2H4, 3 000 mol of C2H6, 600 kmol/h of C3H6, 400 kmol/h C3H8 and 200 kmol/h of n-C4H10 is handled. The bottoms contain 80 kmol/h of C2H6, while the distillate contains 120 kmol/h of C3H6. Table 1 shows the K-values determined at 277K and 8 300 kPa. The K-values can be assumed to be constant regardless of temperature variation. Table 1: K-values at 277K and 8 300 kPa CHA 21 C2H4 19.92 C2H6 13.33 C3H6 6 C3H8 2.46 n-C4H10 1.5 1.4. Use Fenske's equation to determine the minimum number of plates. (3 [11 marks] 936 CD Q W