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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 1 & 2 are fed to the column at F kmol/h, with mole fraction x1F 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 kmol/h 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 kmol/h and a composition of y1D, whilst the reflux stream is returned as a saturated liquid to the top of the column at L kmol/h. The reflux ratio, R, is defined as L/D. 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 kmol/h back into the column. Bottom product passes through a control valve with a flow coefficient
CV and downstream pressure of P0 bar (absolute), at a flowrate of W kmol/h with a molar composition of x1W. 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 12,000 kJ/kmol, a density avg of 700 kg/m3 and molecular weight, Mavg of 100 g/mol, and a viscosity comparable to water. The flow valve has a maximum flow coefficient (US) CV value of 12.
The values assign are
F(kmol/hr)150, X1F 0.45, q 0.67, Dc(m)0.40, Pc(bar)30.2, Qb(kw)935, Po(bar)17.9, Z 0.94, A16.82, B1605.1, C1255.48, A26.80, B2655.8, C2237.71, R 3.8
Task
You should use the template to present your answers to the following questions:
1. With your individual data, calculate y1D, D, W, xW, Tt, Tb, Pp, Tp and CV.
2. Recalculate the output values from Question 1 when your QB value changes by i)+40%, ii)+70%, iii)-30%
3. Recalculate the output values from Question 1 when your x1F value changes by i)+0.2, ii)-0.2
4. Recalculate the output values from Question 1 when your q value changes by i)+0.5, ii)-0.5
5. Recalculate the output values from Question 1 when your reflux ratio, R is changed to i)7, ii)10, iii) its minimum at your QB value
6. Recalculate the output values from Question 1 when the column pressure, PC changes by i)+7 bar, ii)3 bar
7. Calculate the minimum column pressure, PC needed to allow the feed flowrate, F to increase by 130%, and the corresponding change in column conditions.
8. Calculate the pressure and temperature set-points Pp and Tt to give y1D =0.80 and x1W=0.25, and the corresponding reflux ratio.
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