A field 4A molecular sieve adsorbent system is required to produce a gas (MW = 22) that will not condense water at 40 ℉ and 500 psia. Gas to the unit is water saturated at 110 ℉ and 300 psia, and the flow rate is 80 MMscfd. The average water loading of the adsorbent bed is 10% by weight. It is desired that the adsorbent bed operates at a superficial velocity of 40 ft/min. Further, it uses an adsorption time of 8 hours, and heats and cools in 4 hours each in the regeneration process. (20 marks) a) What mass of absorbent is needed to remove the water? b) What are the dimensions of the adsorbent bed?