eprintid: 10043439
rev_number: 37
eprint_status: archive
userid: 608
dir: disk0/10/04/34/39
datestamp: 2018-02-15 12:36:50
lastmod: 2021-10-20 23:59:57
status_changed: 2018-12-10 12:35:18
type: article
metadata_visibility: show
creators_name: Constantinou, A
creators_name: Barrass, S
creators_name: Gavriilidis, A
title: CO2 absorption in flat membrane microstructured contactors of different wettability using aqueous solution of NaOH
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F43
keywords: CO2 capture; membrane contactor; microstructured contactor; NaOH absorbent
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: CO 2 absorption in solutions of sodium hydroxide (NaOH) was performed in three membrane/mesh microstructured contactors: a single-channel polytetrafluoroethylene (PTFE) membrane contactor, a nickel mesh contactor and an eight-channel PTFE membrane contactor. A membrane/mesh was used to achieve gas/liquid mass transfer without dispersion of one phase within the other. The PTFE membrane consisted of a pure PTFE layer 20 μm thick laminated onto a polypropylene (PP) layer of 80 μm thickness. The pure PTFE layer contained pores of ~0.5 to 5 μm diameter and was hydrophobic, while the PP layer consisted of rectangular openings of 0.8 mm×0.324 mm and was hydrophilic. The nickel mesh was 25 μm thick and contained pores of 25 μm diameter and was hydrophilic. Experiments were performed with a 2 m NaOH solution and an inlet feed of 20 vol % CO 2 /N 2 gas mixture. Numerical simulations matched reasonably well the experimental data. CO 2 removal efficiency increased by increasing the NaOH concentration, the gas residence time and the exchange area between gas and liquid. Higher removal of CO 2 was achieved when the PP was in the gas side rather than in the liquid side, due to lower mass transfer resistance of the gas phase. For the same reason, CO 2 removal efficiency was higher for the eight-channel PTFE contactor compared to the nickel mesh contactor. Average CO 2 flux was higher for the eight-channel contactor (8×10 -3 mol/min·cm 2 with PP on the gas side) compared to the nickel mesh contactor (3×10 -3 mol/min·cm 2 ) for the same gas and liquid residence times. The eight-channel PTFE membrane contactor removed around 72% of CO 2 in 1.2 s gas residence time, demonstrating the potential for CO 2 absorption using flat membrane contactors.
date: 2018-12
date_type: published
official_url: http://dx.doi.org/10.1515/gps-2017-0024
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1525134
doi: 10.1515/gps-2017-0024
lyricists_name: Gavriilidis, Asterios
lyricists_id: AGAVR68
actors_name: Gavriilidis, Asterios
actors_id: AGAVR68
actors_role: owner
full_text_status: public
publication: Green Processing and Synthesis
volume: 7
number: 6
pagerange: 471-476
issn: 2191-9550
citation:        Constantinou, A;    Barrass, S;    Gavriilidis, A;      (2018)    CO2 absorption in flat membrane microstructured contactors of different wettability using aqueous solution of NaOH.                   Green Processing and Synthesis , 7  (6)   pp. 471-476.    10.1515/gps-2017-0024 <https://doi.org/10.1515/gps-2017-0024>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10043439/1/Gavriilidis_%5BGreen%20Processing%20and%20Synthesis%5D%20CO2%20absorption%20in%20flat%20membrane%20microstructured%20contactors%20of%20different%20wettability%20using%20aqueous%20solution%20of%20NaOH.pdf