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US 2017/0283364 A1Published application
Method for preparing alpha-hydroxycarboxylic acid esters in which ammonia is recycled
AssigneeEvonik Roehm GmbH
InventorsSteffen KRILL, Belaid AIT AISSA, Alexander MAY, Marcel TRESKOW
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Abstract
The present invention relates to a process for preparing alpha-hydroxycarboxylic esters proceeding from hydrogen cyanide, wherein the ammonia formed in the step of alcoholysis of the corresponding alpha-hydroxycarboxamide is recycled into a hydrogen cyanide preparation process after a purification step.
Claims12
A process for preparing an alpha-hydroxycarboxylic ester, comprising:
- preparing hydrogen cyanide,
- alcoholysis of an alpha-hydroxycarboxamide to obtain said alpha-hydroxycarboxylic ester
- wherein ammonia formed in the alcoholysis of the alpha-hydroxycarboxamide, after a purification step, is recycled into the hydrogen cyanide preparation process still comprising at least one alkylamine.
Dependencies are inferred from the claim text.