Characterization of CO2 flux through hollow-fiber membranes using pH modeling
Abstract
CO2 must be delivered efficiently during large-scale microalgal cultivation. Bubbleless mass-transfer via diffusion through hollow-fiber membranes (HFM) can achieve much higher CO2-transfer efficiency than traditional sparging systems. Here this study developed and used a model to compute accurate values for the CO2 flux (JCO2), overall mass-transfer coefficient (KL), and overall volumetric mass-transfer coefficient (KLa) based on the rate of change of pH in batch experiments. A composite HFM comprised of two macroporous polyethylene layers and a nonporous polyurethane layer was tested for CO2 transfer to a sodium carbonate solution using a range of total pressures, inlet CO2 concentrations, and open-end versus closed-end modes of operation. The model accurately computed JCO2 and KLa for pH values above 8. Key trends are that (i) JCO2 and KLa increased with increasing average inlet CO2 partial pressure; (ii) open-end HFMs performed better than closed-end HFMs when the supplied CO2 was less than 100%; and (iii) the available membrane area used for CO2 mass-transfer decreased as the inlet CO2 partial pressure decreased due to depletion of CO2 inside the membrane, especially for closed-end HFMs, since inert gases could not be vented.
- Authors:
-
- Arizona State University, Tempe, AZ (United States)
- Publication Date:
- Research Org.:
- Arizona State Univ., Tempe, AZ (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1799270
- Alternate Identifier(s):
- OSTI ID: 1564311
- Grant/Contract Number:
- EE0007093
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Membrane Science
- Additional Journal Information:
- Journal Volume: 592; Journal Issue: C; Journal ID: ISSN 0376-7388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; CO2 delivery; membrane carbonation; hollow fiber membrane; mathematical modelling
Citation Formats
Shesh, Tarun, Eustance, Everett, Lai, Yen-Jung, and Rittmann, Bruce E. Characterization of CO2 flux through hollow-fiber membranes using pH modeling. United States: N. p., 2019.
Web. doi:10.1016/j.memsci.2019.117389.
Shesh, Tarun, Eustance, Everett, Lai, Yen-Jung, & Rittmann, Bruce E. Characterization of CO2 flux through hollow-fiber membranes using pH modeling. United States. https://doi.org/10.1016/j.memsci.2019.117389
Shesh, Tarun, Eustance, Everett, Lai, Yen-Jung, and Rittmann, Bruce E. Thu .
"Characterization of CO2 flux through hollow-fiber membranes using pH modeling". United States. https://doi.org/10.1016/j.memsci.2019.117389. https://www.osti.gov/servlets/purl/1799270.
@article{osti_1799270,
title = {Characterization of CO2 flux through hollow-fiber membranes using pH modeling},
author = {Shesh, Tarun and Eustance, Everett and Lai, Yen-Jung and Rittmann, Bruce E.},
abstractNote = {CO2 must be delivered efficiently during large-scale microalgal cultivation. Bubbleless mass-transfer via diffusion through hollow-fiber membranes (HFM) can achieve much higher CO2-transfer efficiency than traditional sparging systems. Here this study developed and used a model to compute accurate values for the CO2 flux (JCO2), overall mass-transfer coefficient (KL), and overall volumetric mass-transfer coefficient (KLa) based on the rate of change of pH in batch experiments. A composite HFM comprised of two macroporous polyethylene layers and a nonporous polyurethane layer was tested for CO2 transfer to a sodium carbonate solution using a range of total pressures, inlet CO2 concentrations, and open-end versus closed-end modes of operation. The model accurately computed JCO2 and KLa for pH values above 8. Key trends are that (i) JCO2 and KLa increased with increasing average inlet CO2 partial pressure; (ii) open-end HFMs performed better than closed-end HFMs when the supplied CO2 was less than 100%; and (iii) the available membrane area used for CO2 mass-transfer decreased as the inlet CO2 partial pressure decreased due to depletion of CO2 inside the membrane, especially for closed-end HFMs, since inert gases could not be vented.},
doi = {10.1016/j.memsci.2019.117389},
journal = {Journal of Membrane Science},
number = C,
volume = 592,
place = {United States},
year = {Thu Aug 15 00:00:00 EDT 2019},
month = {Thu Aug 15 00:00:00 EDT 2019}
}
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