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US 9,809,530 B2Granted
Method for producing alpha-hydroxy carboxylic esters in the gas phase
AssigneeEvonik Roehm GmbH
InventorsSteffen Krill, Belaid Ait Aissa, Alexander May, Matthias Groemping
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Abstract
The present invention relates to a process for preparing alpha-hydroxycarboxylic esters from the alcoholysis of alpha-hydroxycarboxamides in the gas phase, characterized in that the conversion is effected in the presence of water.
Claims6
A process for preparing alpha-hydroxycarboxylic esters, the process comprising:
- performing an alcoholysis reaction of an alpha-hydroxycarboxamide and an alcohol in a gas phase in the presence of a heterogeneous catalyst,
- wherein a molar ratio of the alcohol to the alpha-hydroxycarboxamide is 2-25 mol/mol, and
- wherein the alcoholysis reaction is performed in the presence of 0.01-10 mol/mol of water relative to the alpha-hydroxycarboxamide.
Dependencies are inferred from the claim text.