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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System duction of intermediate materials used for making the main product, the main production step, and finally the ultimate disposal, storage or emission of the ma- terials involved in environment in any form (solid, liquid or gas). Other relevant aspects such as transportation of the raw materials, products or materials related to production process, retail, recycling are also included. Therefore, the basic idea is to incorporate detailed information of the main and side process to fully evaluate their effect on the environment. For any LCA study, raw materials, en- ergy carriers (utilities like steam, and cooling water), electricity etc are considered as inputs, whereas emissions or disposal of any material to air, water or land are taken as outputs. 6.5.1 Goal Definition The main goal of performing the LCA study is to evaluate the environmental impact of the hydrogen purification process from a hybrid of PSA-membrane process system and compare it with the hydrogen purification from the standalone PSA separation system. Since, in principle, multiple hybrid and stand alone configurations are possible, only the best or optimum are considered in this work for the LCA studies, where best is defined as the operating point corresponding to the PSA operation which yields the maximum hydrogen recovery while achieving hydrogen purity in excess of 99.99 %, as shown in the section 6.4.2. Furthermore, the first principles based model developed for the PSA and membrane in previous sections is assumed as the real system in operation. 6.5.2 System Description - Functional Unit The system under study here is the purification section whose purpose is to purify pure hydrogen of purity more than 99.99 % from a multi-component gaseous mix- 155PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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