Study On Functional Zr-doped Silicas With Small-size /PSF Hybrid Membrane And Its Property

Oilfield produced water can not meet the requirement for reinjection after former processes such as gravity sedimentation, flocculation and filtration. So oilfield produced water need to be further treated. Hybrid membranes filtration could remove oil and impurity substance below 100μm in oilfield produced water. However, not only the bonding effect between filling materials in hybrid membranes and polymer chain is not better but also filling materials in hybrid membranes are easy to agglomerate. So the comprehensive property of hybrid membranes could not been further improved. So it is significant to develop the filling materials with better dispersive and better bonding effect with polymer chain.In the paper, filled particles with lower surface energy and better hydrophilic property were added into high polymer, which improves the compatibility between filled particles and the high polymer. So filled particles can disperse uniformly in the high polymer and keep stable small size,which realizes the improvement of the hydrophilic and anti-compression property of filled membrane.Functional Zr-doped silicas with small-size (SZP particles) with stronger hydrophilic property and lower surface energy were prepared and were added into the porous of polysulfone (PSF) into SZP/PSF hybrid membranes. The fitting preparation conditions of SZP/PSF hybrid membranes were: the PSF concentration 13.5wt. %, the PEG400 concentration 16%, the ratio of SZY particles/PSF 10wt.%, intermittent ultrasound, the evaporating time 20s, the coagulation bath temperature 25℃.SEM micrographs show that SZP/PSF hybrid membranes are the asymmetry structure and SZP particles disperse uniformly on the surface of membrane and in the membrane. The permeation flux tests of pure water show that the hydrophilic and anti-compression property of SZP/PSF hybrid membranes have been improved.The permeation flux tests of oilfield produced water(oil concentration and solid suspended matter concentration are less than 20 and 35mg/L, respectively)were carried out under operating pressure of 0.10MPa. The results reveal that oil concentration and solid suspended matter concentration of treated oilfield produced water are less than 0.98 and 14 mg/L respectively, which meet the requirement for reinjection.Finally, the structures of SZP particles, the bonding function between SZP particles and polymer chain of PSF were studied. And the interaction mechanism between oilfield produced water and the surface and pore channels of SZP/PSF hybrid membranes was further researched. Above these are the foundations of hybrid membrane theories.