Problem 3 (28 points)
Situation:
This problem has to do with the recovery of methanol from a gaseous stream by absorption into water in a tray tower (the
gas solvent does not absorb). The mass flow rates at the bottom, densities, and surface tension are as follows:
• Gas stream: 2.2 [kg/s]; 1.8 [kg/m³]
• Liquid stream: 0.9 [kg/s]; 990 [kg/m³]; 0.065 [N/m]
• Other - Water density: 1,000 [kg/m³]; Reference surface tension: 0.02 [N/m];
Tray data are as follows:
• Tray spacing of 60 [cm]; weir height of 4 [cm]; tray (metal) thickness: 2.5 [mm]
• Tray layout: Hole diameter of 5 [mm] in an equilateral triangular pitch of 18 [mm]
• Other data: Foaming factor of 0.90; flooding approach of 75%
Requirements:
Please, select the best answer for the following statements:
1. The surface-tension factor is:
2. The area factor (FHA) is:
3. The constant $C_F$, in [m/s], is:
4. The empirical constant C, in [m/s], is:
5. The superficial gas velocity at flooding, in [m/s], is:
6. The column diameter, in [m], is:
