熔模离心法制备高纯氧化铝基质膜管

Preparation of high pure alumina tubular supported membrane by the meltable moulding centrifugal technique

无机膜以其耐高温、耐腐蚀、性能稳定等优点，在化工、食品、医药、环保等领域的应用日益广泛．本文提出了高铝基质膜管的一种新的制备方法熔模离心法．这种方法脱模容易，可以一次获得孔径由大到小逐渐过渡的梯度管．采用这种方法我们已在实验室制得了顶层孔径为０．２μｍ，通量为１５８ｍ３·ｍ－２·ｈ－１，显气孔率为５８％的梯度管，可以直接作为微滤膜管，也可作为支撑体管，进一步修饰后用于超滤、催化、反应。

A new technique-meltable moulding centrifugal technique is proposed to prepare high pure (>99%Al 2O 3) gradient tubular supported membrane, using fine Al 2O 3 powders. The tubular membrane having high intensity, narrow pore size distribution permeation flux is formed. When its pore diameter is about 0.2 μm, its flux is about 158 m 3·m -2 ·h 1 ( 0.03 MPa,30 ℃) and its porossity is about 58%. Because of the unique characteristics of this kind of high pure gradient tubular supported membrane: thermal stability, structural stability and resistance to chemicals, it can be used as microfiltration membrane directly, or as supporter, used in aeras such as ultrafiltration, membrane reaction and membrane catalysis as a new separation tools, new reactor and catalyst materials by further modification.