Water solubility of additive solvents

Effects of additives. The results are summarized In Figure 2 in terms of water solubility of additive solvent and membrane performance evaluated with 0.2% ovalbumlne aqueous solution. The water flux rises very steeply from zero to 8.8xl0 ml/mln.m In correspondence with Increase In the water solubility of additive solvent from 1 to 4 g/dl. Contrary to the fact that the water flux curve has a plateau for the additive water solubility larger than 4 g/dl, the ovalbumlne permeation values for some water mis-slble additive solvents are undesirably higher than those for additive solvents, of which water solubility Is in the rang,e from 4 to 20 g/dl. 

Figure 3 Illustrates that membrane thickness Increases consistently with water solubility of additive solvents.

Figure 2. Relationship between membrane performance and water solubility of additive solvents (O, 0J solubility of additive solvents in water fA, ik) solubility of water in additive solvents. Water flux is normalized to the staridard value of 8.8 X 10 mL/min m and ovalubumine permeation is normalized to the standard...

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