Analysis of permeate pressure build-up effects on separation performance of asymmetric hollow fiber membranes

The study rectifies some perceptions about pressure build-up in hollow fiber membranes. It is a general intuition that operating at higher pressures permeates more gases, and sometimes the membrane module is tested or characterized at lower pressures to reduce gas consumption. It is also perceived t...

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Published in:Chemical engineering science 2013-12, Vol.104, p.849-856
Main Authors: Kundu, Prodip, Zakaria, Rabitah, Chakma, Amit, Feng, Xianshe
Format: Article
Language:English
Subjects:
Accumulation
Asymmetry
cellulose
Chemical engineering
Deterioration
Fibers
gases
Hollow fiber
Membranes
Perception
Permeance
permeates
Potted length
Pressure build-up
Separation
Separations
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container_title Chemical engineering science
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creator Kundu, Prodip
Zakaria, Rabitah
Chakma, Amit
Feng, Xianshe
description The study rectifies some perceptions about pressure build-up in hollow fiber membranes. It is a general intuition that operating at higher pressures permeates more gases, and sometimes the membrane module is tested or characterized at lower pressures to reduce gas consumption. It is also perceived that higher pressure build-up occurs at higher feed pressures, and membrane performance deteriorates at higher feed pressures. In this study, the apparent and intrinsic permeances of H2 and N2 in asymmetric cellulose acetate-based hollow fiber membranes were evaluated from gas permeation experiments and numerical analysis. It was shown that though the permeate pressure build-up increases as the feed pressure increases, the effect of the permeate pressure build-up on the membrane performance is actually reduced at higher feed pressures. Membrane performs close to its intrinsic separation properties if it is operated at high feed pressures, under which conditions the effect of pressure build-up on the membrane performance is minimized. The pressure build-up effect was further investigated by evaluating the percentage loss in the driving force due to permeate pressure build-up, and it was found that percentage loss in driving force is less at higher feed pressures than that at lower feed pressures. •More permeance underestimation at lower feed pressures.•Impact of pressure build-up on membrane performance is actually lower at higher pressures.•Membrane performs close to its full potential if operated at high feed pressures.•Percentage loss in driving force is less at higher feed pressures.
doi_str_mv 10.1016/j.ces.2013.10.003
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source ScienceDirect Freedom Collection
subjects Accumulation
Asymmetry
cellulose
Chemical engineering
Deterioration
Fibers
gases
Hollow fiber
Membranes
Perception
Permeance
permeates
Potted length
Pressure build-up
Separation
Separations
title Analysis of permeate pressure build-up effects on separation performance of asymmetric hollow fiber membranes
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