C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 67/20 (2006.01) C07C 67/54 (2006.01) C07C 69/675 (2006.01)
Patent
CA 2652315
The continuous process for preparing alpha-hydroxycarboxylic esters, in which the reactants reacted are alpha-hydroxycarboxamide with an alcohol in the presence of a catalyst to obtain a product mixture which comprises alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide, and also alcohol and catalyst; wherein reactant streams comprising, as reactants, an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor; the reactant streams are reacted with one another in the pressure reactor at a pressure in the range from 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia, wherein ammonia is distilled off at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process is particularly advantageously employable on the industrial scale.
L'invention concerne un procédé en continu de fabrication d'esters d'acides alpha-hydroxycarboxyliques, selon lequel un amide d'un acide alpha-hydroxycarboxylique en tant qu'adduit est mis en réaction avec un alcool en présence d'un catalyseur pour obtenir un mélange de produits comprenant l'ester de l'acide alpha-hydroxycarboxylique, de l'ammoniac, de l'amide de l'acide alpha-hydroxycarboxylique non réagi, ainsi que l'alcool et le catalyseur ; l'adduit contenant l'amide de l'acide alpha-hydroxycarboxylique, un alcool et un catalyseur étant introduit dans un réacteur sous pression ; l'adduit étant mis en réaction dans le réacteur sous pression à une pression comprise entre 1 bar et 100 bars ; et l'alcool et l'ammoniac étant éliminés du mélange de produits, l'ammoniac étant éliminé par distillation à une pression maintenue au-dessus de 1 bar, sans l'aide d'agents d'élimination additionnels. Le procédé en continu est applicable de manière avantageuse à l'échelle industrielle.
Ackermann Jochen
Broecker Sonke
May Alexander
Siegert Hermann
Vogel Bernd
Evonik Roehm Gmbh
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
Process for preparing alpha-hydroxycarboxylic esters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing alpha-hydroxycarboxylic esters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing alpha-hydroxycarboxylic esters will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1534992