PMID- 12523858
OWN - NLM
STAT- MEDLINE
DCOM- 20030826
LR  - 20220311
IS  - 1525-7797 (Print)
IS  - 1525-7797 (Linking)
VI  - 4
IP  - 1
DP  - 2003 Jan-Feb
TI  - Dehydration from alcohols by polyion complex cross-linked chitosan composite 
      membranes during evapomeation.
PG  - 137-44
AB  - This study describes the dehydration of an ethanol/water azeotrope during 
      evapomeation using polyion complex cross-linked chitosan composite (q-Chito-PEO 
      acid polyion complex/PES composite) membranes, constructed from quaternized 
      chitosan (q-Chito) and poly(ethylene oxydiglycolic acid) (PEO acid) on a porous 
      poly(ether sulfone) (PES) support. Both the q-Chito/PES composite and the 
      q-Chito-PEO acid polyion complex/PES composite membranes showed high water 
      permselectivity for an ethanol/water azeotrope. Both the permeation rate and the 
      water permselectivity of the q-Chito/PES composite membranes were enhanced by 
      increasing the degree of quaternization of the chitosan molecule because the 
      affinity of the q-Chito/PES composite membranes for water was increased by 
      introducing a quaternized ammonium group into the chitosan molecule. q-Chito-PEO 
      acid polyion complex/PES composite membranes prepared from an equimolar ratio of 
      carboxylate groups in the PEO acid versus quaternized ammonium groups in the 
      q-Chito showed the maximum separation factor for water permselectivity without 
      lowering the permeation rate. With an increasing molecular weight of PEO acid, 
      the separation factor for water permselectivity increased, but the permeation 
      rate almost did not change. The mechanism responsible for the separation of an 
      ethanol/water azeotrope through the q-Chito-PEO acid polyion complex/PES 
      composite membranes was analyzed by the solution-diffusion model. The permeation 
      rate, separation factor for water permselectivity, and evapomeation index of 
      q-Chito-PEO acid 400 polyion complex/PES composite membrane with an equimolar 
      ratio of carboxylate groups in PEO acid 400 and ammonium groups in q-Chito were 
      3.5 x 10(-1) kg/(m(2) hr), 6300, and 2205, respectively, and very high membrane 
      performance. The separation factor for water permselectivity for aqueous 
      solutions of n-propyl and isopropyl alcohol was also maximized at an equimolar 
      ratio of carboxylate groups and ammonium groups and was greater than that for an 
      ethanol/water azeotrope. The above results were discussed from the viewpoint of 
      the physical and chemical structure of the q-Chito-PEO acid polyion complex/PES 
      composite membranes and the permeants.
FAU - Uragami, Tadashi
AU  - Uragami T
AD  - Faculty of Engineering and High Technology Research Center, Kansai University, 
      Suita, Osaka 564-8680, Japan.
FAU - Yamamoto, Satoshi
AU  - Yamamoto S
FAU - Miyata, Takashi
AU  - Miyata T
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Biomacromolecules
JT  - Biomacromolecules
JID - 100892849
RN  - 0 (Alcohols)
RN  - 0 (Cross-Linking Reagents)
RN  - 0 (Indicators and Reagents)
RN  - 0 (Membranes, Artificial)
RN  - 1398-61-4 (Chitin)
RN  - 9012-76-4 (Chitosan)
SB  - IM
MH  - Alcohols/*chemistry
MH  - Chitin/*analogs & derivatives/*chemistry
MH  - Chitosan
MH  - Cross-Linking Reagents
MH  - Desiccation
MH  - Indicators and Reagents
MH  - Membranes, Artificial
MH  - Microscopy, Electron, Scanning
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Thermodynamics
EDAT- 2003/01/14 04:00
MHDA- 2003/08/27 05:00
CRDT- 2003/01/14 04:00
PHST- 2003/01/14 04:00 [pubmed]
PHST- 2003/08/27 05:00 [medline]
PHST- 2003/01/14 04:00 [entrez]
AID - 10.1021/bm025642o [doi]
PST - ppublish
SO  - Biomacromolecules. 2003 Jan-Feb;4(1):137-44. doi: 10.1021/bm025642o.