4. Hydrophilic Pervaporation: Applications in Dehydration
The most classical application of pervaporation as a stand-alone process is the removal of small fractions of water from organic solvents by using a hydrophilic membrane. The success of this application is related to two factors:
1. The ease of separation: because differential transport in pervaporation membranes is related to differences in molecular size and polarity, the separation between water and an organic solvent is beneficial, and high separation factors (and high PSI values) can be obtained rather easily.
2. Process economics: in sharp contrast with wastewater, organic solvents represent an economic value, depending on the specific compound but always positive and sometimes high. ...