A molecular sieve adsorbent used for air separation has a maximum capacity for N₂ of 0.046 g/g at 30°C, and the data can be fitted to a Langmuir isotherm with K = 0.50 atm^-1 

(a) What is the saturation capacity when the adsorbent is exposed to air at 10 atm and 30°C? 

(b) Calculate the ideal absorption time for a bed 4 ft deep operating with a superficial velocity of 20 ft/min. The pellet density is 1.3 g/cm³.