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Impact of the recovery on concentrating acetic acid with low-pressure reverse-osmosis membranes

Pratofiorito, Giorgio 1,2; Horn, Harald 1,2; Saravia, Florencia
1 Engler-Bunte-Institut (EBI), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)


This work deals with the optimization of the concentration of volatile fatty acids (VFAs) using low-pressure reverse osmosis (LPRO) membranes. Membrane filtration of a synthetic solution simulating the product of biomass hydrolysis was performed. Experiments were run on two flat-sheet XLE membranes under 22 and 25 bar in continuous operation mode. Separation efficiency was evaluated for different recoveries. A correlation between the osmotic pressure of the concentrate and the parameter Rc, representative of the separation efficiency, was found. Under the conditions of the present study and taking into consideration the rejection properties of the applied membrane, a recovery of 33% and 44% is recommendable to maximize the ratio between the concentration of acetate in the concentrate and permeate and thus increase the total reclaim of acetic acid.

Verlagsausgabe §
DOI: 10.5445/IR/1000139171
Veröffentlicht am 22.10.2021
DOI: 10.3390/membranes11100742
Zitationen: 6
Web of Science
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen-ID: 1000139171
Erschienen in Membranes
Verlag MDPI
Band 11
Heft 10
Seiten 742
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter low-pressure reverse osmosis; volatile fatty acids; recovery; osmotic pressure
Nachgewiesen in Dimensions
Web of Science
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