Ethanol Processor Design for Hydrogen Production. Kinetic Analysis and Process Integration
2018
Izurieta, Eduardo M. | Adrover, M Esperanza | Pedernera, Marisa N. | López, Eduardo
A kinetic study of ethanol steam reforming was conducted with a commercial nickel-based catalyst. The reaction was studied at atmospheric pressure, with temperatures varying from 550 to 650 °C and residence times up to 25 h·g/Nm³. From the analysis of the product distribution, a scheme of reactions was proposed and used to simulate a pseudohomogeneous reactor and to fit the kinetic parameters. Results showed good fitting with the measured data. The kinetic expressions were profited toward the design of an integrated process of H₂ production from ethanol, which includes a parallel-plate reactor, a shell-and-tube membrane unit, and auxiliary units. Results showed satisfactory thermal integration with efficiencies from 43 to 47% based on lower heating values and from 52 to 57% based on higher heating values. For three different simulation scenarios, outlet streams of about 10 molH₂/h were obtained. The proposed scheme showed robustness, accepting significant variations in the set conditions and still maintaining the process operability.
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