Dehydration processes using membranes with hydrophobic coating

Details Dehydration processes using membranes with hydrophobic coating Dehydration processes using membranes with hydrophobic coating

B - Operations, Transporting

01

D

B01D 53/22 (2006.01) B01D 69/12 (2006.01)

Patent

CA 2695623

Processes for removing water from organic compounds, especially polar compounds such as alcohols. The processes include a membrane-based dehydration step, using a membrane that has a dioxole- based polymer selective layer or the like and a hydrophilic selective layer, and can operate even when the stream to be treated has a high water content, such as 10wt% or more. The processes are particularly useful for dehydrating ethanol.

La présente invention concerne des procédés destinés à retirer l'eau présente dans des composés organiques, en particulier dans des composés polaires, tels que les alcools. Ces procédés comprennent une étape de déshydratation sur membrane, utilisant une membrane comportant une couche polymère sélective à base de dioxole ou similaire et une couche hydrophile sélective, qui peut fonctionner même lorsque le flux devant être traité présente une teneur en eau élevée, par exemple de l'ordre de 10 % en poids ou plus. Ces procédés se révèlent particulièrement utiles pour la déshydratation de l'éthanol.

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