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Question 3 [12 marks] Industrial processes in chemical engineering or laboratory operations in which heat or mass or both are transferred from one fluid to another take place on batch and continuous basis. However, due to various demands in industries most of the operations are carried out on a continuous basis. Such continuous operations are carried out on counter-current and co-current mode. In these operations, the concentration of each phase changes with position. (a) With the aid of well labelled diagrams, derive the general equations of the operating lines in counter-current and co-current processes for gas absorption. (b) Illustrate graphically the equilibrium and operating lines for counter-current and co- current processes when the solute moves from the absorbing solvent into the carrier gas. Note: State all the assumptions and clearly define all nomenclature used