Investigation of the Effects of Temperature on the Microstructure of PTFE Microfiltration Membranes Under Membrane Distillation Conditions
Abstract - 582
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Keywords

PTFE Membranes, Membrane distillation, SEM, temperature, microstructure.

How to Cite

1.
A.J. Hughes, T.K. Mallick, T.S. O’Donovan. Investigation of the Effects of Temperature on the Microstructure of PTFE Microfiltration Membranes Under Membrane Distillation Conditions. J. Adv. Therm. Sci. Res. [Internet]. 2020 Sep. 4 [cited 2024 Mar. 29];7(1):11-2. Available from: https://avantipublishers.com/index.php/jatsr/article/view/870

Abstract

 Polytetrafluoroethylene (PTFE) microfiltration membranes are commonly used in Membrane Distillation (MD) systems, and parameters such as the pore size and porosity have significant influence on their performance. The operating temperature of a membrane distillation unit is typically 60-80˚C, and while PTFE is considered to be thermally stable it does expand with increasing temperature. When dealing with a porous microstructure this expansion becomes significant. It was found that increasing the membrane temperature resulted in an expansion of the fibrous PTFE material and subsequently an increase in pore size. The membrane structure was observed over a period of 80 minutes, this time was deemed necessary given that PTFE has low thermal conductivity and therefore would heat up slowly. Pore size increased by 32% in the first 60 minutes, when the sample was heated to 80˚C. A lumped system analysis of the heat transfer inside the SEM chamber was used to determine a heat transfer coefficient of 0.72 W/m2K. The temperature dependence of pore size will result in fluctuations in performance when the membrane is used intermittently and therefore heated and cooled periodically.
https://doi.org/10.15377/2409-5826.2020.07.2
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References

El-Bourawi MS, Ding Z, Ma R, Khayet M. A framework for better understanding membrane distillation separation process. Journal of Membrane Science 2006; 285(1–2): 4-29. https://doi.org/10.1016/j.memsci.2006.08.002

Khayet M, Matsuura T. Membrane distillation: Principles and applications. Elsevier, 2011; chapter 15: 437. https://doi.org/10.1016/B978-0-444-53126-1.10011-9

Wang P, Chung T-S. Recent advances in membrane distillation processes: Membrane development, configuration design and application exploring. Journal of Membrane Science 2015; 474: 39-56. https://doi.org/10.1016/j.memsci.2014.09.016

Alkhudhiri A, Darwish N, Hilal N. Membrane distillation: A comprehensive review. Desalination 2012; 287: 2-18. Special Issue in honour of Professor Takeshi Matsuura on his 75th Birthday. https://doi.org/10.1016/j.desal.2011.08.027

Lawson KW, Lloyd DR. Membrane distillation. Journal of Membrane Science 1997; 124(1): 1-25. https://doi.org/10.1016/S0376-7388(96)00236-0

Qtaishat MR, Banat F. Desalination by solar powered membrane distillation systems. Desalination 2013; 308: 186-197. New Directions in Desalination. https://doi.org/10.1016/j.desal.2012.01.021

Calvo JI, Hernandez A, Caruana G, Martinez L. Pore size distributions in microporous membranes: I. surface study of tracketched filters by image analysis. Journal of Colloid and Interface Science 1995; 175(1): 138-150. https://doi.org/10.1006/jcis.1995.1439

Feng S, Zhong Z, Wang Y, Xing W, Drioli E. Progress and perspectives in ptfe membrane: Preparation, modification, and applications. Journal of Membrane Science 2018; 549: 332-349. https://doi.org/10.1016/j.memsci.2017.12.032

Blumm J, Lindemann A, Meyer M, Strasser C. Characterization of ptfe using advance thermal analysis techniques. International Journal of thermophysics 2008; 31: 1919-1927. https://doi.org/10.1007/s10765-008-0512-z

Li L, Sirkar KK. Influence of microporous membrane properties on the desalination performance in direct contact membrane distillation. Journal of Membrane Science 2016; 513: 280-293. https://doi.org/10.1016/j.memsci.2016.04.015

Xu J, Singh YB, Amy GL, Ghaffour N. Effect of operating parameters and membrane characteristics on air gap membrane distillation performance for the treatment of highly saline water. Journal of Membrane Science 2016; 512: 73-82. https://doi.org/10.1016/j.memsci.2016.04.010

Saffarini RB, Mansoor B, Thomas R, Arafat HA. Effect of temperature-dependent microstructure evolution on pore wetting in {PTFE} membranes under membrane distillation conditions. Journal of Membrane Science 2013; 429(0): 282-294. https://doi.org/10.1016/j.memsci.2012.11.049

Gryta M, Tomaszewska M, Morawski AW. Membrane distillation with laminar flow. Separation and Purification Technology 1997; 11(2): 93-101. https://doi.org/10.1016/S1383-5866(97)00002-6

Ali A, Macedonio F, Drioli E, Aljlil S, Alharbi OA. Experimental and theoretical evaluation of temperature polarization phenomenon in direct contact membrane distillation. Chemical Engineering Research and Design 2013; 91(10): 1966-1977. The 60th Anniversary of the European Federation of Chemical Engineering (EFCE). https://doi.org/10.1016/j.cherd.2013.06.030

Goldstein JI, Newbury DE, Echlin P, Joy DC, Fiori C, Lifshin E. Scanning electron microscopy and x-ray microanalysis. a text for biologists, material scientists and geologists. kluwer academic 1981. https://doi.org/10.1007/978-1-4613-3273-2

Schneider CA, Rasband WS, Eliceiri KW. Nih image to imagej: 25 years of image analysis. Nature Methods 2012; 9(7): 671-675. https://doi.org/10.1038/nmeth.2089

Schock G, Miguel A. Mass transfer and pressure loss in spiral wound modules. Desalination 1987; 64: 339-352. https://doi.org/10.1016/0011-9164(87)90107-X

Hernández A, Calvo JI, Prádanos P, Palacio L, Rodrguez ML, de Saja JA. Surface structure of microporous membranes by computerized sem image analysis applied to anopore filters. Journal of Membrane Science 1997; 137(1-2): 89-97. https://doi.org/10.1016/S0376-7388(97)00184-1

Brydson JA. Plastics materials. Butterworth-Heineman ltd, Fifth edition 1989; 344.

Engeln I, Hengl R, Hinrichsen G. Thermal expansion and youngs modulus of uniaxially drawn ptfe in the temperature range 100 to 400 k. Colloid and polymer science 1984; 262: 780-787. https://doi.org/10.1007/BF01451707

Kirby R. Thermal expansion of polytetrafluoroethylene (teflon) from -190 to 300 celsius. Journal of research of the national bureau of standards 1956; 57(91). https://doi.org/10.6028/jres.057.010

Garca-Payo MC, Izquierdo-Gil MA, Fernández-Pineda C. Wetting study of hydrophobic membranes via liquid entry pressure measurements with aqueous alcohol solutions. Journal of Colloid and Interface Science 2000; 230(2): 420-431. https://doi.org/10.1006/jcis.2000.7106

Schneider K, Hölz W, Wollbeck R, Ripperger S. Membranes and modules for transmembrane distillation. Journal of Membrane Science 1988; 39(1): 25-42. https://doi.org/10.1016/S0376-7388(00)80992-8

Cengel Y. Heat tranfer: A practical apporach. McGraw-Hill, 2003; Chapter 4: 218-220.

Subodh G, Manjusha MV, Philip J, Sebastian MT. Thermal properties of polytetrafluoroethylene/sr2ce2ti5o16 polymer/ ceramic composites. Journal of Applied Polymer Science 2008; 108(3): 1716-1721. https://doi.org/10.1002/app.27606

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