processo para a desidratação de etanol

PROCESSO PARA A DESIDRATAçãO DE ETANOL. A presente invenção refere-se a um processo para a produção de um etanol pobre em água a partir de pelo menos duas correntes de etanol mais rico em água, que apresentam um diferente teor de água, através de desidratação em membranas, bem como o uso do etanol pobre em água para a produção de éter etil-terc-butílico (ETBE). Preparation of an water-poor ethanol from at least two stream of aqueous rich ethanol, which exhibits different water content, by dewatering the membrane comprises providing ethanol stream separated with different water content into different membrane unit; separating the ethanol stream in the membrane unit into water-poor ethanol as retentate and water-rich permeate; separating the ethanol stream with a high water content from the retentate stream of at least a membrane unit; and/or separating ethanol stream unit from retentate stream of another membrane unit. Preparation of an water-poor ethanol from at least two stream of aqueous rich ethanol, which exhibits different water content, by dewatering the membrane comprises introducing ethanol stream with different water content separately into different membrane unit; separating the ethanol stream in the membrane unit into water-poor ethanol as retentate and water-rich permeate; separating ethanol stream with a high water content using influx from the retentate stream of at least a membrane unit; and/or separating ethanol stream unit from retentate stream of another membrane unit, where the streams that are united exhibits an absolute difference in the ethanol concentration of maximum 1 mass.%. Independent claims are included for: (1) a procedure for the production of ethyl-tert-butyl-ether (ETBE), which is used as an educt to produce water-poor ethanol and the excess ethanol in the process of ETBE as a fresh ethanol is used to produce water-rich ethanol stream; and (2) a composition comprising ethanol and water, with a concentration of less than 1 mass.%, produced by the above procedure.