The extraction index is a measure of membrane operation performance of extracting a desired species from the feed/retentate side in order to have it as permeate. It can be defined/evaluated for any involved species. It gives an indication about the real advantages offered by using a membrane unit instead of conventional ones. The higher the variable value, the higher the performance of the membrane unit. It is defined as the ratio (Eq. 1) of the permeate flow rate of the species permeated through the membrane to that totally fed to the membrane unit. Equation 1 shows different ways for evaluating the extraction index:
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References
Barbieri G, Brunetti A, Tricoli G, Drioli E (2008) An innovative configuration of a Pd-based membrane reactor for the production of pure hydrogen. Experimental analysis of water gas shift. J Power Sources 182(1):160–167. doi:10.1016/j.jpowsour.2008.03.086
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Barbieri, G. (2016). Extraction Index. In: Drioli, E., Giorno, L. (eds) Encyclopedia of Membranes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44324-8_221
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