C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 301/32 (2006.01) C07C 303/04 (2006.01)
Patent
CA 2300083
Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during such distillation to lower the relative volatility of the acetaldehyde impurity, thereby making it possible to obtain a bottoms fraction containing substantially all the acetaldehyde. Purified propylene oxide having a reduced acetaldehyde concentration is removed as an overhead stream. Water may also be effectively separated from the propylene oxide using this procedure.
L'invention concerne un traitement efficace de l'oxyde de propylène résultant d'un processus d'époxydation utilisant du méthanol en guise de solvant. Ce traitement permet d'éliminer l'acétaldéhyde par distillation fractionnée du produit réactionnel brut d'époxidation. Dans ce type de distillation on utilise le solvant méthanol pour abaisser la volatilité relative des impuretés acétaldéhyde, ce qui permet d'obtenir une fraction résidu contenant sensiblement tout l'acétaldéhyde. On retire l'oxyde de propylène purifié présentant une concentration réduite d'acétaldéhyde sous forme d'un flux de tête. Cette procédure permet également de séparer efficacement l'eau de l'oxyde de propylène.
Arco Chemical Technology L.p.
Osler Hoskin & Harcourt Llp
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