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Hydrogen recovery from a H2-H2O-HBr mixture utilizing silica-based membranes at elevated temperatures. 2. Calculation of exergy losses in H2 separation using inorganic membranes

The separation of hydrogen in a thermochemical water decomposition process (UT-3 process) is discussed from the point of view of exergy analysis. In this process, hydrogen is produced by hydrolysis of CaBr and FeBr 2 , which are contained in reactors connected in series, and is separated from H 2 O and HBr at the outlet of the FeBr 2 hydrolysis reactor at 220-560 °C. Hydrogen concentration is anticipated to be of the order of 5 mol %. On the basis of the permeation properties of H 2 O- and H 2 -selective membranes developed in the preceding study, exergy losses for the hydrogen separation are calculated for plausible cases. The total exergy loss is smallest for a two-stage separation system: Steam is separated from a H 2 -H 2 O-HBr mixture using a H 2 O-selective membrane with a minimum loss of pressure and is recycled to the CaBr 2 hydrolysis reactor. The permeate is recompressed to the feed side of the second stage, and hydrogen is then recovered using a H 2 -selective membrane.