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Figure 1 depicts a single - stage chemical exchange process in which a gas flowing from bottom upward is passed over a liquid flowing from

Figure 1 depicts a single-stage chemical exchange process in which a gas flowing from bottom upward is passed over a liquid flowing from top down in a vertical column. The transfer of a chemical from the gas into liquid occurs at rate that is proportional to the difference between the gas and liquid concentrations within the column. The height of the column is 2 metre with a diameter of 20 cm and the packing is 75% of the columns height.
You are given the following values: QG =10 L/min, and QL =1 L/min, cG0=100 g/m3, cL0=10 g/m3. QG and QL are the gas and liquid flow rates, respectively, and D = the gas-liquid exchange rate (L/min). The operating mass holdup for the packing of the absorber is 10% of the packing bed.
Value of D must be: 0.5 L/min
Question 1: Construct an unsteady state mass balance of the system.
Question 2: How do you confirm that the balance is total mass balance?
Question 3: Find values of remaining unknown steady state variables for the system above.
Question 4: What is current degree of freedom for the above case? Is the information enough to make the system ZERO degree of freedom?
Question 5: Create 2 degrees of freedom for the process. If it is the condition, does the process in nonlinearity? Why?
Question 6: What are manipulated and disturbance variables after you decided the condition in Q5 above?
Question 7: Construct a transfer function for the case in Q5 above. (Do not insert any values yet)
Question 8: Analyse the response of the system based on the transfer function you created above (Q7).
Question 9: Propose a control configuration. Draw the configuration. (Hint: You make use of answer in Q6).

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