| abstract |
The reducing cleavage of linear and cyclic acetals,nespecially formal, in an aqueous, a formatencontaining medium succeeds by hydrogenation with hydrogennin the presence of a heterogeneous hydrogenation catalystnat a pH below 7 at a temperature aboven200 ° C. The catalyst poisoning effect of the formatenis at over 200 to 300 ° C, especially over 200 ton280 ° C, overcome, so that with a suspension mode of operationnthe weight ratio of hydration-effective metal to acetalnmuch lower than in the prior art, namely smallern0.1, can be. |