A solvent degreaser is designed to recover toluene from a 378 m3/s (8000 acfm) air stream at 25 °C (77 °F)
and atmosphere pressure. The company is planning to use a two bed carbon adsortion system with a cycle time of 4
hours. The maximum concentration of toluened is kept below 50% of the lower explosive limit for safety purposes.
Given Figure 4.4 in the problem, the adsorption isotherm for toluene, and the additional operational data, estimates: