A column of dishes will be used to absorb ammonia from a gaseous mixture with air, which has 6% ammonia in mol. The column will operate at around 30oC and 1 atm. Water will be fed at a flow rate of 132 kg/h, while the gas stream has a flow rate of 3 kmol/h. Remember that the molar mass of water is 18 g/mol. Henry's law constant for this temperature is 1.36 atm and the equilibrium equation using it is approximately valid over the operating range. a) Consider removing 90% of the ammonia contained in the feed. Graphically calculate the number of equilibrium stages. b) What would be the minimum water flow required for this operation? Are we sizing the column within the range recommended by the rule of thumb for cost-effective choice? c) if the column has an efficiency of 30%, how many dishes would we recommend for the service? d) Consider removing 99% of the ammonia contained in the feed. Graphically calculate the number of equilibrium stages.
A column of dishes will be used to absorb ammonia from a gaseous mixture with air, which has 6% ammonia in mol. The column will operate at around 30oC and 1 atm. Water will be fed at a flow rate of 132 kg/h, while the gas stream has a flow rate of 3 kmol/h. Remember that the molar mass of water is 18 g/mol. Henry's law constant for this temperature is 1.36 atm and the equilibrium equation using it is approximately valid over the operating range.
a) Consider removing 90% of the ammonia contained in the feed. Graphically calculate the number of equilibrium stages.
b) What would be the minimum water flow required for this operation? Are we sizing the column within the range recommended by the rule of thumb for cost-effective choice?
c) if the column has an efficiency of 30%, how many dishes would we recommend for the service?
d) Consider removing 99% of the ammonia contained in the feed. Graphically calculate the number of equilibrium stages.
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