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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System Figure 6.6: LCA system description for the hybrid PSA-membrane separation system the operation. Out of these, methane and carbon dioxide are widely known for causing global warming which raises the earth surface temperature. Therefore, for these gases as environmental loads, global warming potential (GWP) [67, 95] is selected as environment assessment criteria. In this regard, the IPCC working group 4th annual report [50] provides the definition and values of GWP for a list of chemicals, which contributes towards the global warming phenomena. 6.5.4 Life Cycle Inventory Analysis Figures 6.5 and 6.6 also displays the three major inputs for the separation sys- tem under consideration for the LCA analysis. These three inputs are the feed gas from the reformer section, the raw materials such as membranes and PSA adsorbent, and all other energy inputs including utilities like steam and cooling water as energy carriers. Since the main purpose of this LCA is to compare the environmental impact of the hybrid PSA-membrane system with the standalone PSA separation process unit Membrane retentate Off gas Membrane separation process unit Feed to PSA Raw Materials Off gases from PSA 157 Shell side permeate EnergyPDF Image | Operation and Control of Pressure Swing Adsorption Systems
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