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b) By referring to the corrosion chart, perform the preliminary step to choose the most suitable material to be used in the construction of pressure vessel. Justify your answer. i) A slurry of acrylic polymer particles in water is held in storage tanks prior to filtering and drying. Plain carbon steel would be a suitable material for the tanks, but it is essential thar the polymer does not become contaminated with iron in storage. Suggest some alternative materials of construction for the tanks. 14 marks] a ii) Methyl ethyl ketone (MEK) is manufactured by the dehydrogenation of 2-butanol using a shell and tube type reactor, Flue gases are used for heating and pass through the tubes. The flue gases will contain traces of sulfur dioxide. The reaction products include hydrogen. The reaction takes place in the shell at a pressure of 3 bar and temperature of 500 C. Select suitable materials for the tubes and shell. 15 marks