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Towards inhibition of yellowing of mechanical pulps. Part III. Hydrogenation of milled wood lignin

TitleTowards inhibition of yellowing of mechanical pulps. Part III. Hydrogenation of milled wood lignin
Publication TypeJournal Article
Year of Publication1999
AuthorsHu, TQ, James, BR, Wang, Y
JournalJournal of Pulp and Paper Science
Volume25
Pagination312-317
Date PublishedSep
Type of ArticleArticle
ISBN Number0826-6220
Keywordsaromatic compounds, CATALYSTS, CATALYTIC-HYDROGENATION, COMPOUNDS, HYDROGENATION, INHIBITION, lignin model, milled wood lignins, model compounds, OXYGENATION, rhodium compounds, yellowing
Abstract

Oxygenation of hexadecacarbonylhexarhodium(0), Rh-6(CO)(16), in dimethylformamide (DMF) generates nn active catalyst, formulated as Rh-6(mu(3)-O)(4)(OH)(12) (DMF)(n), far the hydrogenation of the aromatic rings of milled wood lignin at similar to 20 degrees C under I atm H-2 in aqueous methyl cellosolve. Partial hydrogenation of the aromatic rings in lignin was confirmed by H-1 NMR spectroscopy. The ability of the catalyst to hydrogenate the lignin model compound 2-methoxy-4-propylphenol is critically dependent on the reaction medium: hydrogenation proceeds faster in aqueous ethanol than in aqueous dioxane, aqueous methyl cellosolve or anhydrous ethanol while no hydrogenation occurs in aqueous DMF.

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