C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/06 (2006.01) C07C 51/377 (2006.01) C07C 57/04 (2006.01) C07C 59/01 (2006.01)
Patent
CA 2554374
The invention relates to a process for the selective, economically viable preparation of methacrylic acid and methacrylic esters starting from acetone cyanohydrin, wherein, in a first step, 2-hydroxy-2-methylpropionic acid is prepared by reacting acetone cyanohydrin with sulphuric acid in the presence of water and a suitable polar solvent and is isolated and methacrylic acid is subsequently prepared by .beta.-elimination of water starting from 2-hydroxy-2-methylpropionic acid.
La présente invention concerne un procédé permettant la préparation sélective et économique d'acide méthacrylique et d'esters d'acide méthacrylique, à partir de cyanhydrine d'acétone, comprenant les étapes suivantes: préparation d'acide 2-hydroxy-2-méthylpropionique par conversion de cyanhydrine d'acétone avec de l'acide sulfurique en la présence d'eau et d'un solvant polaire approprié, et isolation; et préparation d'acide méthacrylique par .beta.-élimination d'eau à partir de l'acide 2-hydroxy-2-méthylpropionique.
Groemping Matthias
Gropp Udo
Krill Steffen
Schultheis Friedel
Evonik Roehm Gmbh
Norton Rose Canada S.e.n.c.r.l.,s.r.l./llp
Roehm Gmbh
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