Consider the PCM distillation column module of Appendix E, in which a 50%–50% mixture of methanol (MeOH) and ethanol is separated.

Do the following sequence of simulations:

(a) Change the Vapor Flow Rate from the initialized value to a new value of 0.045 m³ /s, and start the simulation. Generate plots for the Overhead MeOH Composition and the Bottom MeOH Composition. Record the starting values and final (steady-state) values for these variables.
(b) Once the system has reached a new steady state (and you have collected the information requested in part (a)), increase the Feed MeOH Composition to 0.55. Generate plots for the Overhead MeOH Composition and the Bottom MeOH Composition. Record the starting values and final (steady-state) values for these variables.
(c) Comment on the relative differences between these two input changes (strength of effect, timing of response).