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Titolo:
Pervaporation of water-ethanol mixtures with polyacrylate-grafted polyethylene acid (PE-g-AA) membranes - Physico-chemical analysis of the transport mechanism
Autore:
Ping, ZH; Nguyen, QT; Chen, SM; Ding, YD;
Indirizzi:
Fudan Univ, LMEP, Dept Macromol Sci, Shanghai 200433, Peoples R China Fudan Univ Shanghai Peoples R China 200433 nghai 200433, Peoples R China Univ Rouen, CNRS, UMR 6522, Lab Polymeres Biopolymeres Membranes, F-76821 Mont St Aignan, France Univ Rouen Mont St Aignan France F-76821 F-76821 Mont St Aignan, France
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1, volume: 195, anno: 2002,
pagine: 23 - 34
SICI:
0376-7388(20020101)195:1<23:POWMWP>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ION-EXCHANGE MEMBRANES; IONOMER MEMBRANES; SEPARATION; TEMPERATURE;
Keywords:
polyacrylate-grafted polyethylene; membrane separation; water; ethanol; interaction energy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Ping, ZH Fudan Univ, LMEP, Dept Macromol Sci, Shanghai 200433, Peoples R China Fudan Univ Shanghai Peoples R China 200433 433, Peoples R China
Citazione:
Z.H. Ping et al., "Pervaporation of water-ethanol mixtures with polyacrylate-grafted polyethylene acid (PE-g-AA) membranes - Physico-chemical analysis of the transport mechanism", J MEMBR SCI, 195(1), 2002, pp. 23-34

Abstract

Polyacrylate-grafted polyethylene (PE-g-AA) membranes were studied in pervaporation. The membrane performances are improved by an increase in the acrylic grafting ratio. The water and ethanol sorption and diffusion properties in the membrane loaded with different counter-ions, as well as the interactions between the solvent and the membrane ion pairs, were measured. The results show that the ion pairs are preferentially solvated by water, and the water content in the liquid mixture at which the ion pair is dissociated is much smaller for the potassium membrane than for the lithium membrane. The easier dissociation of the K carboxylate ion pair in the water-ethanol mixture explains the increase in the permeability according to the sequence Li+ < Na+ < K+. The apparent contradiction between the sulfonate and the carboxylate membranes with regards to the alkaline cation sequence according to which the permeability changes is explained by the difference in the ionization ability of the sulfonate and carboxylate ion pairs. (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 07:44:42