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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System Figure 6.8: Variation of CO and CH4 emissions with the membrane area of the hybrid PSA-membrane separation system 6.5.5 Life Cycle Impact Assessment and Interpretation The life cycle impact analysis is done by calculating the global warming potential for the PSA stand alone and the PSA membrane hybrid. For the system at hand, methane and carbon dioxide are the only gases for which GWPs are listed in the latest IPCC report [50], and hence are considered for the analysis. Reported GWP of methane is 21 and is 1 for carbon dioxide for a 10 year time horizon, which is also the time horizon selected for the LCA study. These GWP values are multiplied with the individual inventories (per kg of hydrogen) evaluated in the LCI section and then summed together to obtain the cumulative GWP for the data set. Figure 6.9 depicts the value of cumulative GWP for the standalone PSA and the hybrid process, clearly indicating that the GWP is generally smaller for the hybrid process as compared to the standalone PSA system, represented in the 0.025 0.02 0.015 0.01 0.005 0 Kg of Component Emitted/ Kg of H2 CO CH4 0 0.1 0.5 1 1.5 Membrane Area, m2 159PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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