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The two sub-steps are: Step 1-2 Pressurizing the feed gas from Po to PH. Step 2-3 Feeding this gas into the bed while delivering product, purge gas, and pressurization gas. Here we deal only with the work done by the feed piston; the work done by the product piston in accepting the product gas and expanding it to atmospheric pressure is calculated in section 3.2.6. Before calculating the work for Step 1-2, we must first look to Step 2-3 and calculate the volume of feed at high pressure needed to push a concentration wavefront the entire length of the bed. y=o1 Feed Piston Adsorbent Bed Product Piston M HLB1 Figure 3.4 Piston, Gas,and Shock Wave Velocities DuringConstant Pressure Feed. The bed is initially at high pressure and full of pure, less adsorbed gas. This implies that the mole fraction y is zero.* As the mole fraction of the feed is higher than * When I speak of "y," or "mole fraction," it is implied that this means the mole fraction of the heavy component in the gas phase in the adsorbent bed. Therefore, the mole fraction of gas that only contains light gas is zero. In the example of oxygen separation, nitrogen is the heavy gas and oxygen is the light gas. The mole fraction of pure nitrogen is unity (y = 1), while the mole fraction of air is 0.78 (y = 0.78), and the mole fraction of pure oxygen is zero (y = 0). i 44PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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