A semipermeable membrane composed of a water-insoluble, cross-linked, membrane-forming polymer (hereinafter referred to as “polymer (II)”) which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as “polymer (I)”): [Figu
A semipermeable membrane composed of a water-insoluble, cross-linked, membrane-forming polymer (hereinafter referred to as “polymer (II)”) which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as “polymer (I)”): [Figure] (I) wherein R and R′are halogen, nitro, methyl or ethyl, X stands for a divalent group selected from methylene, ethylene, isopropylidene, ether (－O－), carbonyl (－CO－), sulfide (－S－), sulfoxide (－SO－) and sulfone (－SO2－), l and m are integers of from 0 to 4, p is 0 or 1, and n is an integer of from 100 to 1000, to sulfuric acid groups or alkali metal, ammonium or nitrogen-containing basic organic compound salts thereof, and then cross-linking the “polymer (II)”.
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A water-insoluble semipermeable membrane which has been prepared by immersing a semipermeable membrane consisting essentially of a membrane-forming polymer having the formula: [Figure] (I) wherein R and R′are halogen, nitro, methyl or ethyl and R and R′are the same or different, X is a divalent grou
A water-insoluble semipermeable membrane which has been prepared by immersing a semipermeable membrane consisting essentially of a membrane-forming polymer having the formula: [Figure] (I) wherein R and R′are halogen, nitro, methyl or ethyl and R and R′are the same or different, X is a divalent group selected from the group consisting of methylene, ethylene, isopropylidene, ether (－O－), carbonyl (－CO－), sulfide (－S－), sulfoxide (－SO－) and sulfone (－SO2－), l and m are integers of from 0 to 4, p is 0 or 1, n is an integer of from 100 to 1000, wherein from 15 to 90% of said D groups are sulfuric acid groups or salts thereof with an alkali metal, ammonia or a nitrogen-containing basic organic compound, and the balance of said D groups are hydroxyl groups, in an aqueous solution or an organic solvent solution of a cross-linking agent selected from the group consisting of melamine and urea resins, benzoguanamine resins, amino resins mixed with benzoguanamine resins, aldehydes, di-functional epoxides, tri-functional epoxides and alkaline earth metal divalent cations, under conditions effective to cross-link said polymer whereby to reduce the swelling of the membrane caused by an organic solvent, minimize the reduction of the membrane properties when the membrane is used continuously for a long time and to increase the mechanical strength of the membrane.
Mitchell, Michael Donovan; Collias, Dimitris Ioannis; Bjorkquist, David William; Zaveri, Piyush Narendra; Woolley, Matthew Morgan, Methods for treating water.
Mitchell, Michael Donovan; Collias, Dimitris Ioannis; Bjorkquist, David William; Zaveri, Piyush Narendra; Woolley, Matthew Morgan, Methods for treating water.
Mitchell, Michael Donovan; Collias, Dimitris Ioannis; Bjorkquist, David William; Zaveri, Piyush Narendra; Woolley, Matthew Morgan, Methods of treating water.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Kloos, Steven D.; Rolchigo, Philip M.; Kurth, Christopher J.; Kung, Chia; Cartwright, Thomas J.; Reckin, Richard M.; Sieth, Kenneth J., Residential reverse osmosis system.
Li George S. (Macedonia OH) Giffen ; Jr. William M. (Hudson OH), Semipermeable membranes prepared from polymers containing adjacent, pendent carboxy groups.
Leiser,Robert Matthias; Plobner,Lutz; Yaroshevskaya,Elena Markovna; Zubov,Vitali Pavlovich; Kapustin,Dmitry Valerievich; Yagudaeva,Elena Jurievna, Use of a composite polymer-coated sorbent for separation, purification, desalting and concentration of biopolymers.
Bahm, Jeannine Rebecca; Pearks, Andrew Thomas; Vidal, Guillermo Matias; Collias, Dimitris Ioannis; Mitchell, Michael Donovan; Astle, Robert E.; Faye, Katharine L. K.; Governal, Robert Andrew; Hamlin, Thomas J.; Lucht, Rebecca A.; Patel, Hemang, Water filter materials and water filters containing a mixture of microporous and mesoporous carbon particles.
Bahm, Jeannine Rebecca; Pearks, Andrew Thomas; Vidal, Guillermo Matias; Collias, Dimitris Ioannis; Mitchell, Michael Donovan; Astle, Robert E.; Faye, Katharine L. K.; Governal, Robert Andrew; Hamlin, Thomas J.; Lucht, Rebecca A.; Patel, Hemang, Water filter materials and water filters containing a mixture of microporous and mesoporous carbon particles.
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