[h=3]Dehydration[/h] Strong acid desiccants cause the dehydration of ethanol to form diethyl ether and other byproducts. If the dehydration temperature exceeds around 160 °C, ethylene will be the main product. Millions of kilograms of diethyl ether are produced annually using sulfuric acid catalyst:
2 CH[SUB]3[/SUB]CH[SUB]2[/SUB]OH → CH[SUB]3[/SUB]CH[SUB]2[/SUB]OCH[SUB]2[/SUB]CH[SUB]3[/SUB] + H[SUB]2[/SUB]O (on 120 °C)

Thought this might be of interest.

link here...........http://en.wikipedia.org/wiki/Ethanol#Motor_fuel