B1. Brainstorm some possible alternative adsorbents made from common agricultural and/or forest products or wastes.
B2. The PSA cycle used in Example 18-4 does not produce pure hydrogen throughout the entire feed step. Brainstorm what can be done to change the cycle so that it will produce pure hydrogen.
B3. Separation in chromatography is often limited because the selectivity is too close to 1.0. For both liquid and gas systems, list as many ways as possible that the equilibrium constants can be changed.
B4. What can be done to develop more economical sorption separations?