The ethanol product should meet the special grade, the top grade and normal grade in China edible ethanol standard GB10343-2008, or base on the requirement of the client for producing neutral ethanol in higher grade.
3. The principle of molecular sieve dehydration
Molecular sieve is synthetic zeolites, it is a rigid particulate that made by Muscovite Mica as raw material. It is spherical or cylindrical microporous material with dimensional network structure. Due to the properties of zeolite crystals particles, the micropore with complex structure have the same aperture, its rate range from 0.3nm to 1nm(1nm=10-9m) in general. The most important characteristic of synthetic zeolites is strong adsorbability. They can absorb quickly or slowly and absorb selectively or not. This is what is called a “molecular sieve” effect that preferential adsorption a molecular with particular size but not big molecular. It used the specification of the molecular sieve with 0.3nm in the process of absolute ethyl alcohol (aperture inside is 0.3nm). The diameter of hydrone is 0.28nm, the hydrone can enter the interior of molecular sieve particles and is absorbed thereon; moreover the diameter of ethanol molecule is 0.4nm, cannot enter the aperture and it directly pass the molecular sieve column without being absorbed. By means of the above principle, the process makes the 95%(v/v) alcohol dehydration to 99.6%(v/v) anhydrous alcohol.
4. Process characteristic
4.1 With the application of molecular sieve dehydration and DCS automatic control system, the degree of automation is high and the process is proven and stable.
4.2 With the application of molecular sieve dehydration, it didn’t produce secondary pollution like using cyclohexane for dehydration.
4.3 Low consumption
4.4 It’s easier to achieve large-scale production.
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