Browsing by Keyword "H production"
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Item Membrane reactors using metallic membranes(Elsevier, 2020-01-08) Gallucci, Fausto; Pacheco Tanaka, D. A.; Medrano, J. A.; Viviente Sole, J. L.; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOSA very interesting application of metallic membranes is their integration in multifunctional reactors called membrane reactors. This integration allows carrying out reaction and separation in a single device, which results in higher yields and milder conditions compared with conventional reactor systems. These results translate in lower CAPEX (because of reduction of reaction volume and circumventing downstream separations) and reduction of OPEX (because of milder conditions used in the reactor). This chapter introduces the concept of membrane reactors and gives an overview of the latest results achieved in membrane reactor performance and operation.Item The membrane-assisted chemical looping reforming concept for efficient H2 production with inherent CO2 capture: Experimental demonstration and model validation: Experimental demonstration and model validation(2018-04-01) Medrano, J.A.; Potdar, I.; Melendez, J.; Spallina, V.; Pacheco Tanaka, David A.; van Sint Annaland, M.; Gallucci, F.; Tecnalia Research & Innovation; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOSIn this work a novel reactor concept referred to as Membrane-Assisted Chemical Looping Reforming (MA-CLR) has been demonstrated at lab scale under different operating conditions for a total working time of about 100 h. This reactor combines the advantages of Chemical Looping, such as CO2 capture and good thermal integration, with membrane technology for a better process integration and direct product separation in a single unit, which in its turn leads to increased efficiencies and important benefits compared to conventional technologies for H2 production. The effect of different operating conditions (i.e. temperature, steam-to-carbon ratio or oxygen feed in the reactor) has been evaluated in a continuous chemical looping reactor, and methane conversions above 90% have been measured with (ultra-pure) hydrogen recovery from the membranes. For all the cases a maximum recovery factor of around 30% has been measured, which could be increased by operating the concept at higher pressures and with more membranes. The optimum conditions have been found at temperatures around 600 °C for a steam-to-carbon ratio of 3 and diluted air in the air reactor (5% O2). The complete demonstration has been carried out feeding up to 1 L/min of CH4 (corresponding to 0.6 kW of thermal input) while up to 1.15 L/min of H2 was recovered. Simultaneously, a phenomenological model has been developed and validated with the experimental results. In general, good agreement is observed, with overall deviations below 10% in terms of methane conversion, H2 recovery and separation factor. The model allows better understanding of the behavior of the MA-CLR concept and the optimization and design of scaled-up versions of the concept.