Evapomeation characteristics of cross-linked quaternized chitosan membranes for the separation of an ethanol/water azeotrope

Uragami, Tadashi; Takuno, Makoto; Miyata, Takashi

doi:10.1002/1521-3935(200206)203:9<1162::aid-macp1162>3.0.co;2-q

Cited by 42 publications

(33 citation statements)

References 25 publications

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“…[3,4] We have investigated permeation and separation characteristics of aqueous ethanol solutions using various hydrophilic polymer membranes. [5][6][7][8][9] On the basis of these results, significant swelling of membranes due to the feed mixture remarkably lowered membrane selectivity during pervaporation. The control of membrane swelling has been attempted by chemical modification, crosslinking, and annealing methods.…”

Section: Full Papermentioning

confidence: 94%

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Water/Ethanol Selectivity of New Organic‐Inorganic Hybrid Membranes Fabricated from Poly(vinyl alcohol) and an Oligosilane

Uragami

Yanagisawa

Miyata

2007

Macro Chemistry & Physics

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To control the swelling of PVA membranes, mixtures of PVA and an inorganic oligosilane were prepared using sol‐gel reactions to yield new PVA/oligosilane hybrid membranes. In the separation of an ethanol/water azeotropic mixture during pervaporation, the effect of the oligosilane content on the water/ethanol selectivity of PVA/oligosilane hybrid membranes was investigated. The water/ethanol selectivity of PVA/oligosilane hybrid membranes was higher than that of PVA membranes, but the water/ethanol selectivity of hybrid membranes decreased with increasing oligosilane content. In order to increase the water/ethanol selectivity, PVA/oligosilane hybrid membranes were annealed. The water/ethanol selectivity of annealed PVA/oligosilane hybrid membranes was greater than un‐annealed hybrid membranes, and significantly governed by the oligosilane content, which could be attributed to both sorption and diffusion selectivities. The relationship between the structure of un‐annealed and annealed PVA/oligosilane hybrid membranes along with permeation and separation characteristics of an ethanol/water azeotropic mixture during pervaporation are discussed in detail.magnified image

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Section: Full Papermentioning

confidence: 94%

“…[8,9] It is very important to determine both the sorption selectivity and the diffusion selectivity to elucidate the separation mechanism. The water/ethanol selectivity of an aqueous ethanol solution through the PVA/oligosilane hybrid membranes was investigated based on the solution-diffusion mechanism.…”

Section: Analysis Of Water/ethanol Selectivitymentioning

confidence: 99%

Water/Ethanol Selectivity of New Organic‐Inorganic Hybrid Membranes Fabricated from Poly(vinyl alcohol) and an Oligosilane

Uragami

Yanagisawa

Miyata

2007

Macro Chemistry & Physics

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“…We have studied several kinds of cross-linked polymer membranes and organicinorganic hybrid membranes to separate aqueous ethanol solutions during PV. For example, chitosan membranes cross-linked with glutaraldehyde [5], quaternized chitosan membranes cross-linked with glutaraldehyde [6], ethylenglycoldiglycidylether [7] and poly(ethylene oxydiglycolic acid) [8], poly(vinyl alcohol) and tetraethoxysilane (TEOS) [9], poly(vinyl alcohol-co-acrylic acid) and TEOS [10], and quaternized chitosan and TEOS [11] hybrid membranes prepared by sol-gel reaction all showed high water/ethanol selectivity for an azeotrope of ethanol/water because their membrane swelling could be effectively controlled by crosslinking or hybridization. In this study, sodium carboxymethylcellulose (CMCNa) was selected as a membrane material because CMCNa can be easily formed into fine membrane.…”

Section: Introductionmentioning

confidence: 99%

Dehydration of an azeotrope of ethanol/water by sodium carboxymethylcellulose membranes cross-linked with organic or inorganic cross-linker

Uragami¹,

Wakita²,

Miyata³

2010

Express Polym. Lett.

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Abstract.To control the swelling of sodium carboxymethylcellulose (CMCNa) membranes, mixtures of CMCNa and glutaraldehyde (GA) and mixtures of CMCNa as an organic component and tetraethoxysilane (TEOS) as an inorganic component were prepared, and CMCNa/GA cross-linked membranes and CMCNa/TEOS hybrid membranes were formed. In the separation of an ethanol/water azeotrope by pervaporation (PV), the effects of the GA or TEOS content on the water/ethanol selectivity and permeability of these CMCNa/GA cross-linked and CMCNa/TEOS hybrid membranes were investigated. Cross-linked and hybrid membranes containing up to 10 wt% GA or 10 wt% TEOS exhibited higher water/ethanol selectivity than CMCNa membrane without any cross-linker. This resulted from both increased density and depressed swelling of the membranes by the formation of a cross-linked structure. The relationship between the structure of the CMCNa/GA cross-linked membranes and CMCNa/TEOS hybrid membranes and their permeation and separation characteristics for an ethanol/water azeotrope during PV is discussed in detail.

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“…Consequently, its applications have been reported in a variety of fields. [1][2][3][4][5][6][7][8][9][10] Chitosan powder has been reported to be effective in inhibiting the emission of formaldehyde from plywood. [11,12] Ishimaru reported that chitosan was effective in adsorption and reduction of formaldehyde from various industrial materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Hybrid Chitosan/Acrylic Resin Emulsions and Their Films

Wada¹,

Uragami²

2006

Macro Materials & Eng

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Summary: Solutions containing chitosan of different molecular weights and several acidic monomers were prepared under various aging conditions. Hybrid chitosan/acrylic resin emulsions were prepared from these solutions by emulsion polymerization. The viscosities of the hybrid chitosan/acrylic resin emulsions were influenced significantly by the molecular weight of chitosan, the acidic monomer used, and the aging conditions. DSC and FT‐IR spectroscopy of the hybrid chitosan/acrylic resin films indicated that chitosan was well distributed in the films. The water absorption and formaldehyde adsorption abilities of the acrylic resin films prepared with chitosan were higher than the corresponding films prepared without chitosan, and they increased with increasing molecular weight of the chitosan. The morphology of these films, studied by TEM, revealed that the distribution of chitosan in the hybrid chitosan/acrylic resin emulsion was dependent on the molecular weight of chitosan, the acidic monomer used, and the aging conditions.

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Evapomeation characteristics of cross-linked quaternized chitosan membranes for the separation of an ethanol/water azeotrope

Cited by 42 publications

References 25 publications

Water/Ethanol Selectivity of New Organic‐Inorganic Hybrid Membranes Fabricated from Poly(vinyl alcohol) and an Oligosilane

Water/Ethanol Selectivity of New Organic‐Inorganic Hybrid Membranes Fabricated from Poly(vinyl alcohol) and an Oligosilane

Dehydration of an azeotrope of ethanol/water by sodium carboxymethylcellulose membranes cross-linked with organic or inorganic cross-linker

Preparation and Characterization of Hybrid Chitosan/Acrylic Resin Emulsions and Their Films

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