Liquid-phase hydrogenation of dementholized peppermint oil on Pt/Al₂O₃ catalysts: Part I: A study of catalyst performance

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• 作者：Yori ; Juan C. ; Manuale ; Dé ; bora L. ; Marchi ; Alberto J. ; Grau ; Javier M.
• 关键词：Pt supported on alumina ; (&minus ; )-Menthone catalytic hydrogenation ; (&minus ; )-Menthol isomers selectivity ; Fine chemistry ; Sustainable processes
• 刊名：Applied Catalysis A ; General
• 出版年：2004
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：November 8, 2004
• 卷：275
• 期：1-2
• 页码：221-226
• 文件大小：142 K

摘要

The present work studies the catalytic hydrogenation of the (−)-menthone fraction existing in a dementholized peppermint oil, subproduct of the low-temperature crystallization process of the Arvensis peppermint oil. The aim is to obtain a liquid menthol composition for commercial use that replacing the crystal form. Pt/Al₂O₃ catalysts with different metal content (1 and 4%Pt) were used and the effect of several operating variables is analyzed: H₂ pressure, reaction temperature, and reactant mass/catalyst mass ratio. Total conversion values ((−)-menthone + (+)-isomenthone) in the order of 95%on the fresh catalyst after 4h on-stream were obtained for 4%Pt/Al₂O₃. These conversion values decrease when the catalyst is reused, which is indicative of deactivation. When the Pt content is reduced, the total conversion values fall drastically. The (−)-menthone to (−)-menthol selectivity values are higher than 90%in every case.