This preview shows page 1. Sign up to view the full content.
Unformatted text preview: lysis: New random packings and structured packings have been introduced with higher capacity, lower pressure drop, and higher efficiency than trays. Also for packed columns, liquid distributors have been greatly improved. Channeling of liquid in packed columns is now much less of a problem. Exercise 7.3
Subject: Condenser coolant for distillation of a methane-ethane mixture. Find: Appropriate coolant. Analysis: Assume that the distillate is nearly pure methane, the most volatile of the two components. To use cooling water, the distillate temperature would be approximately 120oF. But the critical temperature of methane is -115oF. Therefore could not condense it. The critical pressure of methane is 673 psia. Using Fig. 7.16, could consider operation at 415 psia because that is safely below the critical pressure (P/Pc = 0.62 and could operate as high as a P/Pc = 0.8). From Perry's Handbook (p. 3-203, 6th edition), at P = 415 psia (28.6 bar), the saturation temperature of methane is 176 K or -143oF. To co...
View Full Document