Gas separation, CO2 capture, petrochemical and food industry, are only the most important fields employing membrane technologies as separation processes. The characterization of membrane materials is based on the knowledge of their permeability P and diffusivity D. Although data of P and D are available in literature for a wide group of materials, agreement between the results of the different procedures to measure them, is sometimes poor and may be material-dependent. In this work we present a new versatile experimental set up fabricated to carry out P and D measurements with high accuracy. The apparatus is a high vacuum set up allows the measurements with two methods: static and dynamic. The static method consists in a constant-volume variable-pressure procedure, dynamic one employ a Mass Spectrometer (MS) to perform a selective and rapidly measurements of transient flux through membranes. Both methods measure P and D. Respect to other apparatus, it present substantial improvements. It is equipped with a Spinning Rotor Gauge thanks to which it is possible to obtain measure with high accuracy. It has a new freestanding membrane assembly that guarantee the same feed and permeate area in order to avoid later diffusion. In the dynamic procedure MS allows to run experiment without sweeping gas to prevent sample diluition which diminishes analytical sensitivity. Finally, It allows permeability measurements in a high range of values, making it available for a wide group of materials for several applications: materials with high and very low permeability (for separation or sealing applications respectively).
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|Titolo:||Experimental set-up to characterize membranes for gas and vapor separation processes|
|Data di pubblicazione:||2018|
|Appare nelle tipologie:||04.01 - Contributo in atti di convegno|