Preparation of Composite Membranes Via PVA/PAM Solution Coating onto Hydrophilized PVDF Hollow Fiber Membrane and Their Pervaporation Separation of Water-ethanol Mixture

Poly vinylidene fluoride (PVDF) hollow fiber membranes were hydrophilized using polyethylenimine (PEI) and p-xylylene dichloride (XDC), and poly(vinyl alcohol) (PVA) and poly (acrylic acid -co- maleic acid) (PAM) mixed solutions by varying the concentration of PAM were coated onto PVDF membrane surface. The surface coating was verified by the observation of scanning electron microscope (SEM) and the permselective characteristcs of the resulting composite membranes were tested for 90 wt% aqueous ethanol solution by the pervaporation technique. The effects of the corsslinking agent concentraion, the temperature of feed solution, and the reaction temperature on the flux and separation factors were measured. Typically, the flux, $1,480g/m^2hr$ at the reaction temperature $100^{\circ}C$, PAM 3 wt%, feed temperature $70^{\circ}C$ was obtained, on the other hand, for the separation factor, ${\alpha}_{W/E}=82$ at the conditions of the reaction temperature $100^{\circ}C$, PAM 15 wt% and feed temperature $25^{\circ}C$ was shown.

PVDF 중공사막의 표면친수화 후 PVA/PAM 용액의 코팅을 통한 복합막제조와 이의 물-에탄올계의 투과증발 분리

Poly vinylidene fluoride (PVDF) 중공사막을 polyethylenimine (PEI)와 p-xylylene dichloride (XDC)를 이용해 친수화 시킨 후 poly(vinyl alcohol) (PVA)과 가교제인 poly(acrylic acid-co-maleic acid) (PAM) 혼합용액을 코팅하여 막을 제조하였다. 중공사막 표면의 코팅여부는 scanning electron microscope (SEM)을 통해 관찰하였으며, 막의 특성평가를 위해 물/에탄올 혼합액에 대한 투과증발 실험을 수행하였다. 공급액 조성은 90 wt% 에탄올 수용액을 사용하였으며, 가교제 농도, 공급액과 반응온도 변화에 따른 투과도 및 선택도를 측정하였다. 투과도는 반응온도 $100^{\circ}C$, PAM 농도 3 wt%, 공급액온도 $70^{\circ}C$에서 $1,480g/m^2hr$, 그리고 선택도는 반응온도 $100^{\circ}C$, PAM 농도 15 wt%, 공급액온도 $25^{\circ}C$에서 ${\alpha}_{W/E}=82$의 결과를 얻을 수 있었다.