Approximately four liters of the mixture were poured into the
feed tank of the module for each run. After heating to 50 °C, the
mixture was pumped into the membrane and the pressure was set
to begin the permeate flux. All the runs were undertaken with a
flow rate of 700 L/h, corresponding to a tangential velocity of
about 8 m/s. The permeate was collected and the concentrate was
completely recirculated to the feed tank.