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QUESTION 3 (20 marks) (a) Design a polymeric membrane with selective removal of one segment (polylactic (8) acid) of the polymeric chains to produce large and narrow size porous structure, respectively. (b) In the recent flood, muddy water was flowing through the rivers and streams. (6) Propose on how the water can be cleaned using the technique learnt in the class? (c) In a multicomponent distillation process, the following components are obtained according to their volatility, propane >n-butane >n-pentane > n-hexane. Which (2) of these components will appear at distillate and bottom, respectively? Justify your answer. (d) In the adsorption process, explain how temperature influences the process. (e) How are adsorption and desorption process conducted? (2) (2)