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Experimental Studies on CO2 Absorption in Hollow Fiber Membrane Contactor
Mälardalen University, School of Sustainable Development of Society and Technology. (Bioenergy group)
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Membrane gas absorption technology is considered as one of the promising alternatives to conventional techniques for CO2 separation from the flue gas of fossil fuels combustion. As a hybrid approach of chemical absorption and membrane separation, it may offer a number of important features, including operational flexibility, compact structure, linear scale up and predictable performance. The main challenge is the additional membrane mass transfer resistance, especially when this resistance increases due to the absorbent intruding into the membrane pores.

In this thesis, the experimental was set up to investigate how the operating parameters affect the absorption performance when using absorbent in hollow fiber contactor, and to obtain the optimal range of operation parameters for the designated membrane gas absorption system . During 20 days’ continuous experiment, we observed that the CO2 mass transfer rate decreases significantly following the operating time, which is attributed to the increase of membrane mass transfer resistance resulting from partial membrane wetting.

To better understand the wetting evolution mechanism, the immersion experiments were carried out to assume that the membrane fibers immersed in the absorbents would undergo similar exposure as those used in the membrane contactor. Various membrane characterization methods were used to illustrate the wetting process before and after the membrane fibers were exposed to the absorbents. The characterization results showed that the absorbent molecules diffuse into the polypropylene (PP) polymer during the contact with the membrane, resulting in the swelling of the membrane. In addition, the effects of operating parameters such as immersion time, CO2 loading, as well as absorbent type on the membrane wetting were investigated in detail. Finally, based on the analysis results, methods to smooth the membrane wetting were discussed. It was suggested that improving the hydrophobicity of PP membrane by surface modification may be an effective way to improve the membrane long-term performance.

Modification of the polypropylene membrane by depositing a rough layer of PP was carried out in order to improve the non-wettability of membrane. The comparison of long-term CO2 absorption performance by PP membranes before and after modification proves that the modified polypropylene membranes retained higher hydrophobicity than the untreated polypropylene membrane. Therefore modification is likely to be more suitable for use in membrane gas absorption contactors for CO2 separation, particularly over long operation time.

Place, publisher, year, edition, pages
Mälardalen University: Västerås , 2010.
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 121
Keyword [en]
CO2 capture; Hollow fiber membrane contactor; Membrane gas absorption; Partial wetting; Surface modification;
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-9617ISBN: 978-91-86135-75-1 (print)OAI: oai:DiVA.org:mdh-9617DiVA: diva2:320200
Presentation
2010-06-04, U2-012, Mälardalen University, Högskoleplan 1, Västerås, 10:00 (English)
Opponent
Supervisors
Available from: 2010-05-24 Created: 2010-05-24 Last updated: 2014-01-22Bibliographically approved
List of papers
1. CO2 capture by the absorption process in the membrane contactors
Open this publication in new window or tab >>CO2 capture by the absorption process in the membrane contactors
2009 (English)In: 6th Vienna International Conference on Mathematical Modeling, MATHMOD 2009, 2009Conference paper, Published paper (Refereed)
Abstract [en]

Post combustion CO2 capture is corresponding to the most widely applicable option in terms of industrial sectors and is compatible to a retrofit strategy. In addition to the conventional chemical absorption process, membrane gas absorption is considered as one of the promising alternatives to conventional techniques for the CO2 separation from the flue gas of fossil fuels combustion. As a hybrid approach of chemical absorption and membrane separation, it may offer a number of important features, e.g., economical viability due to its larger interfacial area, no flooding at high flow rates, no foaming and channeling, linear scale-up with predictable performance. This paper is to describe and present the state-of-the-art of the R&D efforts on membrane contactors focused on the microporous hallow fiber structure. The operating principles, liquid absorbents selection, influence of membrane wetting phenomenon, membrane materials and module types have been intensively reviewed. Model parameters including economic performance has been evaluated with comparison of other technologies. Technical obstacles of applying membrane contactors in CO2 capture process have also been discussed. The knowledge and application gaps have been examined and identified, thus providing a recommendation for the future studies.

Keyword
CO2 capture and storage; carbon dioxide; hollow fiber membrane; membrane contactors; numerical modeling
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-9611 (URN)
Conference
MATHMOD 2009, Austria, February 11 - 13, 2009
Projects
Swedish Research Links Programme
Available from: 2010-05-24 Created: 2010-05-24 Last updated: 2014-01-14Bibliographically approved
2. Experimental investigation on CO2 absorption using absorbent in hollow fiber membrane contactor
Open this publication in new window or tab >>Experimental investigation on CO2 absorption using absorbent in hollow fiber membrane contactor
2008 (English)In: International Scientific Conference on "Green Energy management and IT", Stockholm, March 12-13, 2008, 2008Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:mdh:diva-1146 (URN)
Available from: 2010-10-04 Created: 2008-10-03 Last updated: 2013-12-04Bibliographically approved
3. INFLUENCE OF MEA AND MDEA SOLUTIONS ON SURFACE MORPHOLOGY OF MICROPOROUS POLYPROPYLENE MEMBRANES
Open this publication in new window or tab >>INFLUENCE OF MEA AND MDEA SOLUTIONS ON SURFACE MORPHOLOGY OF MICROPOROUS POLYPROPYLENE MEMBRANES
Show others...
2009 (English)In: The First International Conference on Applied Energy (ICAE09), 2009Conference paper, Published paper (Refereed)
Abstract [en]

Membrane has a potential to improve the CO2 capture process. In this paper, experimentswere carried out to investigate the impact of amine absorbents on membrane surfaceproperties with polypropylene (PP) fibers immersed in monoethanolamine (MEA) andmethyldiethanolamine (MDEA) aqueous solutions with and without CO2 loading. The surfacemorphological changes of the membrane were examined by using scanning electronmicroscopy (SEM). The experimental results showed that the fibers immersed in the aqueoussolutions without CO2 loading underwent significant deformation than those with CO2 loading,which is mostly linked to the decrease of absorbent concentration with the reaction betweenCO2 and aqueous solutions. It was also found that the morphological changes of membraneimmersed in MDEA were severer than that in MEA due to the lower surface tension of theformer.

Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-7598 (URN)
Conference
The First International Conference on Applied Energy (ICAE09)
Available from: 2010-10-04 Created: 2009-11-29 Last updated: 2013-12-04Bibliographically approved
4. Wetting of polypropylene hollow fiber membrane contactors
Open this publication in new window or tab >>Wetting of polypropylene hollow fiber membrane contactors
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2010 (English)In: Journal of Membrane Science, ISSN 0376-7388, Vol. 362, no 1-2, 444-452 p.Article in journal (Refereed) Published
Abstract [en]

The membrane wetting by the absorbent leads to the increase of mass transfer resistance and deterioration of CO2 absorption performance during membrane gas absorption process. In this paper, polypropylene (PP) fibers were immersed in monoethanolamine (MEA), methyldiethanolamine (MDEA) and deionized (DI) water, respectively, assuming that the immersed PP fibers would undergo similar exposure conditions as those used in hollow fiber membrane contactor. The wetting evolution of PP fibers was investigated as a function of immersion time. The characterization results confirmed that the absorbent molecules diffused into the PP polymer during the exposure process, resulting in the swelling of the membrane. The absorption-swelling wetting mechanism was proposed to explain what happened during the wetting process. A 30.8° reduction in the contact angle was observed, indicating that the membrane surface hydrophobicity decreased significantly following the immersion time. Experimental results showed that the membrane surface morphology and surface roughness suffered significant and complicated changes after being immersed in the absorbents for a certain period. It was found that the absorbent with higher surface tension is in favor of fewer changes of the membrane surface morphologies. Based on the experimental results, improving the membrane surface hydrophobicity was suggested as an effective way to overcome the wetting problem.

Keyword
Wetting; Hollow fiber membrane contactors; Polypropylene; Surface morphologies; CO2 capture
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-10361 (URN)10.1016/j.memsci.2010.06.067 (DOI)000281571100049 ()2-s2.0-77955665036 (Scopus ID)
Projects
Swedish Research Links Programme
Available from: 2013-06-17 Created: 2010-10-04 Last updated: 2014-06-19Bibliographically approved
5. Experimental study on PP membrane modification and performance evaluation for CO2 absorption in hollow fiber membrane contactors
Open this publication in new window or tab >>Experimental study on PP membrane modification and performance evaluation for CO2 absorption in hollow fiber membrane contactors
2010 (English)In: The Second International Conference on Applied Energy (ICAE2010), 2010Conference paper, Published paper (Refereed)
Abstract [en]

The membrane wetting by amine absorbents is a big concern and may result in performance deterioration of membrane gas absorption technology for CO2 post-combustion capture. In this paper, the polypropylene membrane was modified by depositing a rough layer on the membrane surface so as to improve the membrane non-wettability. Characterization results showed that the contact angle increases dramatically from 122˚ to 162˚ by the modification, thereby improving the hydrophobicity of the membrane. The modified membrane characteristics were also studied by the correlation of scanning electron microscope and atomic force microscopy results. In addition, CO2 absorption in the polypropylene hollow fiber membrane contactors with and without surface modification was investigated in a continuous experiment for 20 days using an aqueous MEA solution as the absorbent. The long-term system operation results showed that the modified PP hollow fiber membrane contactor is feasible for CO2 capture from the flue gas of large-scale power plants.

Keyword
Carbon dioxide capture; Hollow fiber membrane contactors; Partial wetting; Surface modification;
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-9615 (URN)
Conference
21-23 April, 2010, Singapore
Projects
Swedish Research Links Programme
Available from: 2010-05-24 Created: 2010-05-24 Last updated: 2013-07-30Bibliographically approved

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