Abstract
We investigated the dehydration of several biomass-derived polyols in sub- and supercritical water, in particular m-erythritol, 1,2-propanediol and 1,3-propandiol. The resulting main products were 1,4-anhydroerythritol and propionaldehyde. The additives tested for their catalytic performance were among others zinc, nickel, copper, magnesium and sodium sulfate as well as sulfuric acid. A positive catalytic effect of bivalent transition metal salts was found. Initial educt and ZnSO 4 concentration variations were carried out in order to determine the reaction orders. Further, activation energies and activation volumes were measured for zinc catalysed dehydrations of the above-mentioned polyols. Finally, a possible explanation for the reaction enhancing or inhibiting effect of different salts is given and discussed.
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