Error Analysis in Assessment of Single-Component Permeability and Ideal Separation Selectivity of Low-Permeability Membrane Materials

Page: 214

O. Prokopováb, B. Bernauera, V. Fílaa, P. Čapeka, P. Sysela, P. Hrabánekb, A. Zikánováb, L. Brabecb, and M. Kočiříkb

a Department of Inorganic Technology, Institute of Chemical Technology, Prague, b J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague


Composite membranes containing molecular sieve particles embedded in a polyimide matrix are promising due to their increased permeability and high selectivity in gas separation processes. Determination of permeability of dense membranes is time-consuming and the resulting values are loaded with experimental errors. The impact of uncertainty in various quantities on the reliability of the permeability values measured by the constant volume/variable pressure method was analyzed. The total uncertainty of the measurements on polyimide/Silicalite-1 membranes is 7–13 %, the errors in membrane thickness and permeation coefficient being the main contributing factors.


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