Vapour phase oxidation process
AssigneeLaporte Industries Limited
InventorsBrian Keith Howe, Francis Robert Frederick Hardy, Douglas Alfred Clarke
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Abstract
In the oxidation of .alpha., .beta.-diols to .alpha., .beta.-diones with oxygen, the use of a catalyst comprising at least one metal selected from Cu, Ag and Au and at least one element selected from Ge, Sn, Pb, N, P, As, Sb, Bi. In the oxidation of ethylene glycol to glyoxal with oxygen, condensing ethylene glycol from the products from the reactor and thereafter lowering the temperature to condense the glyoxal. A purification process for glyoxal uses a weakly basic anion exchange resin.
Claims13
In a process for the production of a dicarbonyl compound by catalytic vapour phase oxidation of cyclohexane-1,2 diol or an aliphatic diol of the formula:
- ##EQU2## in which R and R.sup.1, which may be the same or different, are hydrogen or an alkyl group containing up to 3 carbon atoms, comprising passing a gaseous mixture of oxygen and said diol at a temperature of between 180.degree. and 600.degree.C over an oxidation catalyst, the improvement wherein said oxidation catalyst consists essentially of one or more metals selected from a copper phosphorus alloy containing up to 15% phosphorus in the form of copper phosphide and a silver-copper-phosphorus alloy containing from 1 to 99% silver, balance copper-phosphorus containing up to 15% phosphorus in the form of copper phosphide, the catalyst optionally containing one or more elements selected from the group consisting of gold, arsenic, antimony and tin.
In a process for the catalytic vapour phase oxidation of cyclohexane-1,2 diol or an aliphatic diol of the formula:
- ##EQU3## in which R and R.sup.1, which may be the same or different, are hydrogen or an alkyl group containing up to 3 carbon atoms, to the corresponding di-carbonyl compound comprising passing a gaseous mixture of oxygen and said diol at a temperature of between 180.degree. and 600.degree.C over an oxidation catalyst, the improvement wherein said oxidation catalyst consists essentially of copper together with antimony.
Dependencies are inferred from the claim text.