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Titel:
Performance of ceramic membranes at elevated pressure and temperature: effect of non-ideal flow conditions in a pilot scale membrane separator
 
Auteur(s):
 
Gepubliceerd door: Publicatie datum:
ECN 1-11-1998
 
ECN publicatienummer: Publicatie type:
ECN-RX--98-061 Artikel wetenschap tijdschrift
 
Aantal pagina's:
22  

Gepubliceerd in: Journal of Membrane Science (Elsevier), , 1999, Vol.155, p.241-259.

Samenvatting:
Microporous silica membrane manufacturing technology has been scaled-upand tubes with several hundred cm2 of membrane surface area have been prepared. Practical problems in applying high-temperature ceramic membrane technology, such as sealing and ceramic metal joining, have been solved successfully on pilot scale. Experiments show that membranes developed are capable of selectively separating hydrogen from a gas mixture containing hydrogen at elevated pressures and temperatures. Permselectivity values for H2/CH4 separation are as high as 28. The gas separation performance of membranes is influenced by the flow conditions at both the feed and permeate side of the membrane separators. By performing high-temperature high-pressure separation experiments and simulation of the non-ideal flow effects around the membrane, the influence of the flow effects is predicted. The operation of the pilot scale membrane separator is simulated by a two-dimensional, one-phase mathematical model which predicts the basic features of the separator from an engineering point of view. A comparison between the experimental data and the modelling results yields the conclusion that the dispersion model predicts much better the membrane separator performance than the simplified model which assumes plug flow on both sides of the membrane separator. 29 refs.


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