A composite membrane made from polyethylenimine (PEI) coated on a microporous polysulfone support and crosslinked with
m-tolylene-2, 4-diisocyanate (TDI) was used to investigate the reverse osmosis performance of EtOH-H
2O mixture. Applied pressure ranged 20-80 kg/cm
2. Permeation rate in this range were proportional to operating pressure, being 20-110×10
-5 cc/cm
2-sec. With 2% of PEI and 2% of TDI, solute rejection was reached to 64%, which was superior to DDS-HR-98 membrane but lower than PEC-membrane (Toray Industries, Inc.), while permeation rate of water was 60×10-5 cc/cm2-sec which was superior to that of PEC membrane.
Some parameters relating to the reverse osmosis performance,
A, σ, α, β and
DEM/
Kσ were determined experimentally for PSET membrane with a view to assist the design of reverse osmosis system of aqueous ethanol solution.
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