QUESTION 2 a) Separations using membrane are becoming increasingly important in the process industries. Elaborate one limitation in the current membrane technology and propose the technology or approach to overcome that limitation. (8 marks) b) Reverse osmosis is a separation process technology that refers to the fact that applied pressures must exceed the osmotic pressure of the feed before water is forced through the membrane. Illustrate and explain the mechanism of reverse osmosis membrane process. (12 marks) c) A membrane is defined as a thin layer of material, which separates two liquid phases, two gas phases, or a liquid-gas phase. With the aid of diagrams, describe four (4) important types of ideal flow patterns in gas permeation. (15 marks)