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Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

Dyrda, Kay Marcel; Wilke, Vincent; Haas-Santo, Katja; Dittmeyer, Roland

Abstract:
The gas/liquid phase separation of CO2 from a water-methanol solution at the anode side of a µDirect-Methanol-Fuel-Cell (µDMFC) plays a key role in the overall performance of fuel cells. This point is of particular importance if the µDMFC is based on a “Lab-on-a-Chip” design with transient working behaviour, as well as with a recycling and a recovery system for unused fuel. By integrating a membrane-based micro contactor downstream into the µDMFC, the efficient removal of CO2 from a water-methanol solution is possible. In this work, a systematic study of the separation process regarding gas permeability with and without two-phase flow is presented. By considering the µDMFC working behaviour, an improvement of the overall separation performance is pursued. In general, the gas/liquid phase separation is achieved by (1) using a combination of the pressure gradient as a driving force, and (2) capillary forces in the pores of the membrane acting as a transport barrier depending on the nature of it (hydrophilic/hydrophobic). Additionally, the separation efficiency, pressure gradient, orientation, liquid loss, and active membrane area for different feed inlet temperatures and methanol concentrations are investigated to obtain an insight into the separation process at transient working conditions of the µDMFC.

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Verlagsausgabe §
DOI: 10.5445/IR/1000087481
Veröffentlicht am 10.05.2019
Originalveröffentlichung
DOI: 10.3390/chemengineering2040055
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikroverfahrenstechnik (IMVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2305-7084
KITopen-ID: 1000087481
HGF-Programm 34.12.01 (POF III, LK 01)
Multiphasen und thermische Prozesse
Erschienen in ChemEngineering
Band 2
Heft 4
Seiten Article: 55
Schlagwörter gas/liquid separation; micro direct methanol fuel cell (µDMFC); porous membranes; micro channel; two-phase flow; micro contactor; separator
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