Purification of a methanol stream

Details Purification of a methanol stream Purification of a methanol stream

C - Chemistry, Metallurgy

07

C

C07C 29/84 (2006.01) C07C 31/04 (2006.01) C07C 45/83 (2006.01) C07C 47/09 (2006.01)

Patent

CA 2301271

Acetaldehyde may be effectively removed from a contaminated methanol stream using a distillation method wherein a solvent stream comprised of a relatively heavy polar compound such as water or propylene glycol is utilized as an extractive distillation solvent. Following the separation of the polar compound from the bottoms stream obtained by extractive distillation, the purified methanol may be recycled for use as a reaction solvent in an olefin epoxidation process.

La présente invention concerne un procédé de distillation permettant d'éliminer efficacement l'acétaldéhyde d'un flux de méthanol contaminé. Un flux de solvant comprend un composé polaire relativement lourd tel que de l'eau ou du propylèneglycol utilisé comme solvant de distillation extractive. Après la séparation du composé polaire du flux de résidus obtenu par distillation extractive, le méthanol purifié peut être recyclé pour être utilisé comme solvant de réaction dans un processus d'époxydation d'une oléfine.

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