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A mixture of components 1 & 2 are fed to the column at F kmol / h , with mole fraction x 1 F and
A mixture of components & are fed to the column at F kmolh with mole fraction xF and state q The column has an internal diameter of DC m and contains NR plates in the rectifying section with a plate efficiency of The column operates at an absolute pressure of PC bar.
Vapour leaves the top of the column at V kmolh and passes through a partial condenser. The condenser works by vaporising a propane refrigerant, which is maintained at pressure Pp bar with resultant temperature Tp deg C Top product leaves at D kmolh and a composition of yD whilst the reflux stream is returned as a saturated liquid to the top of the column at L kmolh The reflux ratio, R is defined as LD At the bottom of the column some of the liquid leaving passes through a reboiler with a duty of QB kW giving a saturated vapour flow of V kmolh back into the column. Bottom product passes through a control valve with a flow coefficient
CV and downstream pressure of P bar absolute at a flowrate of W kmolh with a molar composition of xW The primary measured parameters used for process control are Pp at the top of the column and Tb at the bottom.
Liquid feed and product streams can be assumed to have a latent heat, avg of kJkmol a density avg of kgm and molecular weight, Mavg of gmol and a viscosity comparable to water. The flow valve has a maximum flow coefficient US CV value of
The values assign are
Fkmolhr XF q Dcm Pcbar Qbkw Pobar Z A B C A B C R
Task
You should use the template to present your answers to the following questions:
With your individual data, calculate yD D W xW Tt Tb Pp Tp and CV
Recalculate the output values from Question when your QB value changes by i ii iii
Recalculate the output values from Question when your xF value changes by i ii
Recalculate the output values from Question when your q value changes by i ii
Recalculate the output values from Question when your reflux ratio, R is changed to i ii iii its minimum at your QB value
Recalculate the output values from Question when the column pressure, PC changes by i bar, ii bar
Calculate the minimum column pressure, PC needed to allow the feed flowrate, F to increase by and the corresponding change in column conditions.
Calculate the pressure and temperature setpoints Pp and Tt to give yD and xW and the corresponding reflux ratio.
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