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Through distillation alone, ethanol can only be dehydrated to around 95% to 97% purity. The last 3-5% of water is unable to be removed through distillation techniques due to the formation of an a Zoetrope, a point at which water no longer boils out of a solution. This remaining water has to be removed to allow ethanol to be used as fuel and in gasoline blending. To achieve fuel grade ethanol, molecular sieve, along with Pressure Swing Adsorption (PSA) technology, is applied and anhydrous ethanol can be achieved with ethanol purity around 99% pure or higher. 3A Molecular Sieve is capable of adsorbing water molecules, while allowing ethanol to pass through to the product stream.