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Titolo:
Swelling determination of W/O/W emulsion liquid membranes
Autore:
Wan, YH; Zhang, XJ;
Indirizzi:
S China Univ Technol, Inst Environm Sci, Guangzhou 510641, Peoples R ChinaS China Univ Technol Guangzhou Peoples R China 510641 1, Peoples R China
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 2, volume: 196, anno: 2002,
pagine: 185 - 201
SICI:
0376-7388(20020228)196:2<185:SDOWEL>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURFACTANT MEMBRANES; WATER TRANSPORT; ORGANIC-ACIDS; LACTIC-ACID; WASTE-WATER; EXTRACTION; SEPARATION; COPPER; PHASE; LAYER;
Keywords:
swelling stability; tracer method; membrane separation; emulsion liquid membranes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Wan, YH Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England UnivOxford Parks Rd Oxford England OX1 3PJ ford OX1 3PJ, England
Citazione:
Y.H. Wan e X.J. Zhang, "Swelling determination of W/O/W emulsion liquid membranes", J MEMBR SCI, 196(2), 2002, pp. 185-201

Abstract

Based on the definition of swelling in emulsion liquid membrane (ELM) process, the concepts of apparent swelling and actual swelling are proposed to illustrate the relationship between the emulsion swelling (the osmotic swelling and entrainment swelling) and the membrane breakage, focussing on the effect of the volume change caused by emulsion swelling and membrane breakage on the experimental results. Theoretical analyses indicate that "zero" or "negative" swelling may occur under certain experimental conditions. A bi-tracer method is further proposed and then used to measure the osmotic, entrainment swelling and the membrane breakage simultaneously, only requiringsome initial operation conditions and measurements of concentrations of both tracers in the external and internal phases. It has been experimentally proved that this new method is highly applicable in ELM process and provides a useful tool to specify the effects of membrane breakage, osmotic swelling and entrainment swelling in the same experiment. "Negative" swelling mayoccur under certain operating conditions, particularly when the electrolyte concentration in the external phase is higher than that in the internal phase. The experimental results also indicate that the effect of membrane breakage on the measurement of emulsion swelling should not be neglected to avoid measurement error. Polymeric surfactant LMA is superior to other commercial surfactants as it imparts high membrane stability and small emulsion swelling. (C) 2002 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 20:04:06