If I recall from a lab class many years ago, we used an ionic salt that had a hydrated form to adsorb the water out of the ethanol. Somthing like copper sulphate might work, in that it has a hydrated form when exposed to moisture. Sufficient heating of the crystals would drive off the water, and then the salt could be re-used. Ideally, the salt chosen would be insoluble in ethanol, and would be harmless for the end use. One would batch distill to the Azeotropic state and then add sufficient anhydrous salt to absorb the moisture present. The salt would be filtered out and heated to drive off moisture and the cycle repeated. It is not energy efficient, and I just checked and saw online that most commercial plants now being built are using vapor phase separation with a zeolite used for absorbtion of the moisture with a pressure swing cycle to rejuvenate the zeolite. The reason cited is that it is less energy intensive. Rich Hagen