It is interesting to observe a flux increasing in the beginning of the filtration for most of the runs. Probably, until the phase initially retained on the membrane surface is removed by the convective flux and a concentration profile is established, which is the transient period, there is an increase in the flux. After this initial period, due to the size of glycerol agglomerates and the pressure used, permeation occurs through the membrane pores, and consequently the fouling, which reduces the flux.