摘要
聚矾(Polysulfone)制成的中空纤维,其纤维壁是一种具有多孔的膜(Porous membrane),在外表涂敷硅橡胶(Silicon e rubber)后,成为一外表面无孔的复合膜(Nonporous composite membrane)。这种复合膜对混合气体的渗透性能是随气体的成份、压力以及复合膜的结构而变化。其变量的数学模型可由单独气体透过橡胶质聚合物(Rubbery polymer)及玻璃质聚合物(Glassy polymer)的7种物理性质来表示。在复合膜内,微孔分布并不均匀,亦不对称,今一般称之为非对称膜(Asymmetric membrane)。用这种中空纤维制成的气体渗透器(Per-meater),可以用原始点微分方程式(Initial value problem)作为渗透其混合气体效能的数学模型,从其数学解答就能详细列出渗透器内的进气,渗透气的数量、成份以及压力分布的详细情况。连接及组合数个单元气体渗透器的计算,就完成了整个混合气体渗透分离系统的化工设计,用来确定渗透器材料的选择,构造的改进及评审气体分离工厂的成效。
Based on the permeation of rubbery and glassy polymers to gases,seven parameters are chosen for the mathematical modeling of astruc-tured composite membrane such as the one made of polysulfone asym-metric hollow-fiber with silicone rubber coating.Because of theasymmetric membrane structure,a typical hollow-fiber gas permeator,now in industrial use,can be modeled as an intial value problem by aset of equations for multicomponent feed gas.The simulation providesa detailed profiles within the permeator along with the resultingpermeate and residue streams.Sequential simulation of several singlepermeators one after the other constitutes an easy means of the simu-lation of an entire gas permeation process.It will be a useful toolfor membrane material selection,pilot plant evaluation,permeatordesign and optimization,and the performance checking of an operatingplant.
出处
《膜科学与技术》
CAS
CSCD
1989年第2期1-22,共22页
Membrane Science and Technology
