Side of a @MT06878@ into which penetrants enter from the feed stream.
Source: PAC, 1996, 68, 1479. (Terminology for membranes and membrane processes (IUPAC Recommendations 1996)) on page 1485 [Terms] [Paper]
Citation: 'upstream' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.UT06882 RISBibTexEndNote