Isopropyl Alcohol Dehydration
Isopropyl alcohol (C3H8O or CH3CHOHCH3 or (CH3)2CHOH) dissolves a wide range of non-polar compounds. It also evaporates quickly, leaves nearly zero oil traces, compared to ethanol, and is relatively non-toxic, compared to alternative solvents. Thus, it is used widely as a solvent and as a cleaning fluid, especially for dissolving oils.
Isopropyl alcohol is miscible in water and forms an azeotrope. The azeotrope with water exists at a composition that is 91% by volume isopropyl alcohol and 9% water so simple distillation cannot be used to achieve dryness levels below this.
Alternatively, dehydration via molecular sieve has proven an effective means of drying IPA beyond the azeotrope.
Molecular sieves rely on the difference in molecular size between the solvent and water. IPA has a molecular size of ~16A and water has a molecular size of 2.6A allowing a 3A or 4A molecular sieve to adsorb water and allow the IPA to pass through the bed.
Wintek design and builds IPA MSDUs (both Liquid Phase and Gas Phase) depending upon the incoming water concentration and outgoing dryness requirements.