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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System Figure 6.7: Variation of CO2 emissions with the membrane area of the hybrid PSA-membrane separation system PSA, the role of these inputs can be ignored. For example, the feed gas will have a contribution to total inventory for a single LCA study but it will clearly cancel out during a comparative study as its value is kept at the same value for the hy- brid and PSA separation system. Also, manufacturing of intermediate products like the membranes and PSA adsorbent is a onetime process in product life cycle and thus its contribution as compared to actual every day off gas emissions can also be assumed negligible. The system output stream comprises of off gas con- taining H2, CO, CH4, CO2 and N2. Figures 6.7 and 6.8 shows the amount (kg) of each component leaving the system boundary per kg of product H2. These figures draw a comparison of emission of each component as function of membrane area, where zero area means the corresponding results for standalone PSA process. 0.041 0.04 0.039 0.038 0.037 0.036 0.035 0.034 0.033 0.032 0.031 0.03 Kg CO2 Emitted/ Kg of Product H2 0 0.1 0.5 1 1.5 Membrane Area, m2 158PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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