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Aqueous solutions of arabinonic acid in equilibrium with the corresponding γ-lactone and δ-lactone were hydrogenated to arabitol in a batch reactor in the presence of an active-carbon-supported, ruthenium catalyst. Total conversion was achieved at 100 o C under 10 MPa H 2 pressure. Depending upon the impurities present in solutions, the selectivities to arabitol were in the range 93...
Water solutions of glucono-δ-lactone and glucono-γ-lactone in equilibrium with gluconic acid were hydrogenated with molecular hydrogen in the presence of a commercial carbon-supported ruthenium catalyst (5% Ru/C, Engelhard Escat 40). Reactions were conducted batchwise on 20 wt% solutions under 100 bar pressure in the temperature range 80–140°C. Reaction rates were unexpectedly high at moderate temperatures...
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