GAS SEPARATION MECHANISMS IN MICROPOROUS MODIFIED GAMMA-AL2O3 MEMBRANES

被引:147
作者
KEIZER, K
UHLHORN, RJR
VANVUREN, RJ
BURGGRAAF, AJ
机构
[1] Univ of Twente, Netherlands
关键词
Alumina--Porosity - Ceramic Materials--Thin Films - Gases--Separation - Mass Transfer--Mathematical Models;
D O I
10.1016/S0376-7388(00)80935-7
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The transport of pure gases and of binary gas mixtures through a microporous composite membrane is discussed. The membrane consists of an alumina support with a mean pore diameter of 160 nm and an alumina top (separation) layer with pores of 2-4 nm. The theory of Knudsen diffusion, laminar flow and surface diffusion is used to describe the transport mechanisms. It appears for the composite membrane that Knudsen diffusion occurs in the top layer and combined Knudsen diffusion/laminar flow in the support at pressure levels lower than 200 kPa. For the inert gas mixture H2/N2 separation factors near 3 could be achieved, which is 80% of the theoretical Knudsen separation factor. This value is shown to be the product of the separation factor of the support and of the top layer. The value for the top layer is rather low due to the relatively small pressure drop across this layer. This situation can be improved by using composite membranes consisting of three or more layers, resulting in a larger pressure drop across the separation layer.
引用
收藏
页码:285 / 300
页数:16
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