US 9,809,530 B2
Method for producing alpha-hydroxy carboxylic esters in the gas phase
Steffen Krill, Muehltal (DE); Belaid Ait Aissa, Darmstadt (DE); Alexander May, Seeheim-Jugenheim (DE); and Matthias Groemping, Darmstadt (DE)
Assigned to Evonik Roehm GmbH, Darmstadt (DE)
Appl. No. 15/323,888
Filed by Steffen Krill, Muehltal (DE); Belaid Ait Aissa, Darmstadt (DE); Alexander May, Seeheim-Jugenheim (DE); and Matthias Groemping, Darmstadt (DE)
PCT Filed Jul. 23, 2015, PCT No. PCT/EP2015/066819
§ 371(c)(1), (2) Date Jan. 4, 2017,
PCT Pub. No. WO2016/016073, PCT Pub. Date Feb. 4, 2016.
Claims priority of application No. 14179444 (EP), filed on Aug. 1, 2014.
Prior Publication US 2017/0144960 A1, May 25, 2017
Int. Cl. C07C 67/20 (2006.01); B01J 21/06 (2006.01); C01C 1/08 (2006.01); C01C 3/02 (2006.01)
CPC C07C 67/20 (2013.01) [B01J 21/066 (2013.01); C01C 1/08 (2013.01); C01C 3/02 (2013.01)] 6 Claims
 
1. 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.