| http://www.w3.org/ns/prov#value | - Furthermore, the undesirable estery aromas, produced during the hydrogenation of isoalpha acids to tetrahydroisoalpha acids according to Hay, are not formed, and steam-stripping to remove these, as described in his patents, is therefore not required, even when alcohols such as methanol, ethanol, and isopropanol are employed in the reaction medium, quite in contrast to Hay '572, Col. 2, lines 47-56
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