Energy Efficiency of Gas Separation Pressure Swing Adsorption

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Energy Efficiency of Gas Separation Pressure Swing Adsorption ( energy-efficiency-gas-separation-pressure-swing-adsorption )

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3.3.6 Expansionof Product Gas and NetWork Again, to compare the Ideal Four-Step cycle with the Four-Step cycle and the reversible work of separation, we expand the product gas from PHto Po in and isothermal turbine to recover work WR. (see Equation (3.59)). The net work for the Ideal Four-Step cycle is: wIA =wp +wB +wPU+ww +wPR+wR ( 3 J 5 ) A summary of these work terms can be found in Table 3.2. The recovery is again found by dividing the number of product moles by the number of moles of the light component in the feed and the result is the same as that for the Four-Step cycle. The same criteria for minimum pressure ratio exists, and if the cycle is to produce any product, the inequaUty in Equation (3.66) must be true. 83

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