Process for the production of malonic acid or a salt thereof
AssigneeDegussa AG
InventorsThomas Haas, Martin Meier, Christoph Brossmer, Dietrich Arntz, Andreas Freund
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Abstract
Malonic acid or a salt of the same is obtained at high yield according to the invention through the catalytic oxidation with oxygen or an O.sub.2 -containing gas of 3-hydroxy propionaldehyde or 3-hydroxy propionic acid in the aqueous phase. The conversion takes place in the presence of at least 10 percent by weight, relative to the C.sub.3 building block used, of a precious metal from the platinum group. Pd and Pt supported catalysts are preferred.
Claims12
In a process for the production of malonic acid or a salt thereof comprising the catalytic oxidation of a C.sub.3 starting material with oxygen or an oxygen-containing gas in the presence of a catalyst comprising a precious metal from the platinum group in the aqueous phase at a pH-value equal to or greater than 6 and isolation of the malonic acid or a salt of the same from the reaction mixture, the improvement wherein
- as the C.sub.3 starting material there is used 3-hydroxy propionaldehyde and the catalyst is used in a quantity corresponding to at least 10 percent by weight of the precious metal relative to the C.sub.3 starting material.
Dependencies are inferred from the claim text.