Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1998-03-03
1999-12-28
Dentz, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
549325, 549326, 502185, 568864, C07D30708, C07D30758, C07C 2704, C07C 29149
Patent
active
060083840
ABSTRACT:
An improved two step (dual stage catalysis) aqueous hydrogenation process and a novel trimetallic hydrogenation catalysts consisting essentially of highly dispersed, reduced ruthenium and rhenium metals in the presence of a third metal tin on carbon support particular useful in the second stage of the process. Such process and catalyst exhibit high conversion rates in aqueous solution hydrogenation of hydrogenatable precursors (e.g., maleic acid, succinic acid, corresponding esters, .gamma.-butyrolactone, etc.) to tetrahydrofuran, .gamma.-butyrolactone, 1,4-butanediol and mixtures thereof wherein the relative molar ratio of 1,4-butanediol to tetrahydrofuran products being produced can be controlled.
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S. B. Ziemecki et al., Surface Mobility of Re.sub.2 O.sub.7 in the System Re.sup.7 +Pd.sup.0 /.gamma.-A1.sub.2 O.sub.3, Academic Press, Inc., 207-217, Jan. 3, 1986.
Bockrath Richard Edmond
Campos Daniel
Schwartz Jo-Ann Theresa
Stimek Richard Thomas
Dentz Bernard
E. I. Du Pont de Nemours and Company
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