Theoretical issues in solvent dehydration purification
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The boiling point of our solvents is between 60 and 90, while the boiling point of water is 100. The pressure at the top of the tower is kept around 3 kilograms. Currently, the temperature at the top of the tower is controlled between 80 and 95, which allows the moisture level to be kept below 20 ppm. I’m not quite sure why water, with its higher boiling point, is still carried out at the top of the tower.
The molecular weight of H2O is 18, similar to that of methane, so it should be a light component. The boiling point of liquid water is around 100 degrees Celsius because there are hydrogen bonds between small molecules; as the molecular weight increases, the boiling point rises accordingly. The solubility of water in mineral oil is very low; water does not exist in the form of free water, but rather as monomolecular entities. Being a light component compared to C6, it vaporizes from the top of the tower. Therefore, the solvent oil entering the dehydration tower must not contain free water.