A mixture of 40 mol% benzene and 60 mol% toluene is fed in the form liquid in a flash vessel. The feed rate is 100 kmol/h, and the drum operates at a temperature that imposes a vaporization of 30% of the feed. The table below presents benzene-toluene equilibrium data in terms of the composition of the benzene (more volatile). x is the composition in the liquid and y in the gas, both on a molar basis. The data equilibrium are for the case of mixing at 1 atm. α iindicates the relative volatility. like benzene and toluene form a liquid solution approximated by the ideal case, the relative volatility does not more is than the ratio of the vapor pressures to the equilibrium temperature of the system. Note that the relative volatility changes little with the composition, in which case, for engineering calculations in general, we can consider it to be close to average: about 2.5. a) Use the defined relative volatility and flash vessel knowledge to determine the compositions of the liquid and gaseous products of the described operation. Then set the vessel operating temperature. b) Given item a, what would be the feed temperature required for the presented configuration?
A mixture of 40 mol% benzene and 60 mol% toluene is fed in the form liquid in a flash vessel. The feed rate is 100 kmol/h, and the drum operates at a temperature that imposes a vaporization of 30% of the feed. The table below presents benzene-toluene equilibrium data in terms of the composition of the benzene (more volatile). x is the composition in the liquid and y in the gas, both on a molar basis. The data equilibrium are for the case of mixing at 1 atm. α iindicates the relative volatility. like benzene and toluene form a liquid solution approximated by the ideal case, the relative volatility does not more is than the ratio of the vapor pressures to the equilibrium temperature of the system.
Note that the relative volatility changes little with the composition, in which case, for engineering calculations in general, we can consider it to be close to average: about 2.5.
a) Use the defined relative volatility and flash vessel knowledge to determine the compositions of the liquid and gaseous products of the described operation. Then set the vessel operating temperature.
b) Given item a, what would be the feed temperature required for the presented configuration?
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