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 10 wt % or more. The processes are particularly useful for dehydrating ethanol.
This invention was made in part with Government support under award number NRCS-68-3A75-4-140, awarded by the United States Department of Agriculture, and award number DE-FG02-04ER84001 awarded by the United States Department of Energy. The Government has certain rights in this invention.