Error Analysis in Assessment of Single-Component Permeability and Ideal Separation Selectivity of Low-Permeability Membrane Materials
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 713 %, the errors in membrane thickness and permeation coefficient being the main contributing factors.
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