C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 301/32 (2006.01)
Patent
CA 2507071
The present invention relates to a process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NH2 group capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. The invention also relates to a process for the catalytic epoxidation of propene that includes this purification stage.
L'invention concerne un procédé permettant de purifier un oxyde de propylène brut contenant du méthanol et de l'acétaldéhyde par distillation extractive en continu au moyen d'un solvant d'extraction; réduction de la volatilité du méthanol; et ajout d'un composé contenant un groupe NH¿2? non substitué capable de réagir avec l'acétaldéhyde dans une colonne de distillation à un point supérieur au point d'alimentation de l'oxyde de propylène brut pour obtenir un oxyde de propylène purifié contenant moins de 100 ppm de méthanol et moins de 100 ppm d'acétaldéhyde. Cette invention concerne également un procédé permettant l'époxydation catalytique du propylène, lequel procédé comprend l'étape de purification susmentionnée.
Haas Thomas
Hofen Willi
Thiele Georg
Woell Wolfgang
Degussa Ag
Evonik Degussa Gmbh
Marks & Clerk
Uhde Gmbh
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