IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0645848
(1975-12-31)
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발명자
/ 주소 |
- Dege Gerald J. (Parsippany NJ) Liu Kang-Jen (Somerville NJ)
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출원인 / 주소 |
- Allied Chemical Corporation (Morris Township NJ 02)
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인용정보 |
피인용 횟수 :
31 인용 특허 :
0 |
초록
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Novel single film bipolar membranes, of substantially improved efficiency and durability, i.e. having an ion selectivity above 80% in an electrolyte medium of about one mole, are prepared from pre-swollen films containing a relatively high amount, i.e. at least 15% of an insoluble cross-linked aroma
Novel single film bipolar membranes, of substantially improved efficiency and durability, i.e. having an ion selectivity above 80% in an electrolyte medium of about one mole, are prepared from pre-swollen films containing a relatively high amount, i.e. at least 15% of an insoluble cross-linked aromatic polymer. Under controlled conditions, high dissociable cationic-exchange groups are chemically bonded to the aromatic nuclei to a desired depth of the film from one side only; subsequently, highly dissociable anion-exchange groups are chemically bonded to the unreacted aromatic nuclei on the other side of the film. The functionalized, densely structured single film ion exchange membrane undergoes negligible degradation, is blister free, and is uniquely suited for electrodialysis particularly water-splitting operations due to its low electrical resistance and low salt leakage. The membrane operates with improved current efficiencies at both high electrolyte concentrations and high current densities, for time periods not previously achievable.
대표청구항
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A single film bipolar polymeric membrane, having an ion selectivity above 80% in an electrolyte medium of at least 0.1 molar, derived from monomers selected from the group consisting of [Figure] and [Figure] (I) (II) wherein R1 to R7 are substituents selected from the group consisting of hydrogen, c
A single film bipolar polymeric membrane, having an ion selectivity above 80% in an electrolyte medium of at least 0.1 molar, derived from monomers selected from the group consisting of [Figure] and [Figure] (I) (II) wherein R1 to R7 are substituents selected from the group consisting of hydrogen, chlorine, fluorine, alkyl radicals of 1 to 5 carbon atoms and phenyl radicals and copolymers thereof, and chlorinated and fluorinated polymers and copolymers thereof containing intimately dispersed therein at least 15 percent by weight based on the total weight of membrane, of a polymer providing aromatic nuclei and comprised of monomer units of the formula [Figure] (III) wherein R8, R9 and R10 are substituents selected from the group consisting of hydrogen, alkyl radicals of 1 to 4 carbon atoms, phenyl substituted alkyl radicals of 2-4 carbon atoms, phenyl, phenoxy-, thiophenoxy, and naphthyl radicals and the hydroxyl-, alkoxyl-, and halo-substituted phenyl, phenoxy, thiophenoxy, and naphthyl radicals, and wherein at least one substituent of (III) is an aromatic radical, said membrane being cross-linked to a degree equivalent to that obtained by a 2 to 20 weight percent mixture of a commercial 55 percent divinyl benzene in styrene, and wherein about 50-98 percent of the membranes cross-section has highly dissociable cation exchange groups chemically bonded to the aromatic nuclei from one side only and having from about 2-50%, highly dissociable anionic exchange groups chemically bonded to the aromatic nuclei on the opposite side of said film.
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