摘要:
A cation exchanger of polysulfone polymer consisting essentially of a sulfonated product of a polysulfone polymer having at least one chloromethyl (--CH.sub.2 Cl) or mercapto (--SH) group per molecule, or a cured product thereof, and having an ion exchange capacity of from 0.5 to 3.5 meq/g dry resin.
摘要:
An anion exchanger consisting essentially of an aromatic polysulfone block copolymer of the formula: ##STR1## wherein Ar is ##STR2## or ##STR3## X is --SO.sub.2 --, ##STR4## --S-- or --O--, Y is --SO.sub.2 --, --S-- or --O--, Z is a single bond, --O--, --S--, --SO.sub.2 --, ##STR5## each of R.sub.1 to R.sub.9 which may be the same or different is a hydrocarbon group having from 1 to 8 carbon atoms, each of a to d is an integer of from 0 to 4, e is an integer of from 0 to 3, (f+g) is from 0 to 7, (h+i) is from 0 to 5, each of R.sub.10 and R.sub.11 is a hydrogen atom or a hydrocarbon group having from 1 to 6 carbon atoms, and each of m and n is an integer of from 2 to 200, provided m/n=100/1-1/10, and having anion exchange groups introduced to the aromatic rings of the copolymer.
摘要:
An anion exchange membrane comprising a resin phase which contains from 20 to 96 mass % of a polymer having repeating units represented by the following formula (1): wherein A is a C3-8 alkylene group or an alkyleneoxyalkyl group having a total carbon number of from 4 to 9, each of R1, R2 and R3 is a hydrogen atom, a C1-6 alkyl group or a hydroxyalkyl group, and X− is an anion, and wherein any hydrogen atom bonded to the benzene ring may be substituted by an alkyl group or a halogen atom, and from 4 to 80 mass % of a thermoplastic polymer having no ion exchange groups, substantially uniformly.
摘要:
A method for separating and recovering an acid, which comprises contacting to one side of a diffusion dialysis membrane an acid solution containing an acid having an acid radical with a formula weight of at most 200 and impurities and to the other side of the membrane water or a dilute acid solution, to separate and recover the acid in the solution, wherein the diffusion dialysis membrane comprises a cation exchange membrane having certain specific properties or comprises a main layer of an anion exchanger and a surface layer of the cation exchange membrane having certain specific properties formed on the main layer at the side of which is contact with the acid solution.
摘要:
A heterogeneous anion exchanger comprising from 35 to 85 mass % of an anion exchange resin and from 15 to 65 mass % of a binder polymer, wherein the anion exchange resin is made of a polymer having repeating units represented by the following formula (1): wherein R is a C3-8 alkylene group or an alkyleneoxyalkyl group having a total carbon number of from 4 to 9, R1 is a C1-4 alkyl group which may be substituted by a hydroxyl group, each of R2 and R3 is a C1-4 alkyl group, and X− is an anion, and wherein any hydrogen atom bonded to the benzene ring may be substituted by an alkyl group or a halogen atom.
摘要:
A method for producing deionized water by an electro-regenerating deionization method, which comprises employing a deionized water producing apparatus comprising an electrodialyzer, and ion exchangers being accommodated in the demineralizing compartments, supplying water to be treated in the demineralizing compartments and supplying a concentrated water to the concentrating compartments, wherein the concentrated water at the outlet of the concentrating compartments has a S value of 7 or more as defined by the following formula (1) and a pH of 2.5 or more: S value=(&ggr;−420000×A)/(B×(1−(A/0.004))3) Formula(1), wherein &ggr; is electro-conductivity(&mgr;S/cm), A is hydrogen ion concentration (mol/l), and B is magnesium ion concentration (ppb).
摘要:
An organic dispersion is prepared of an acid type fluorinated polymer comprises copolymerizing a fluorinated ethylenically unsaturated monomer and a functional monomer having an acid type functional group in an aqueous medium under an action of a polymerization initiator source to obtain an aqueous dispersion of an acid type fluorinated polymer having the functional monomer unit content of 5 to 40 mol %; and replacing an aqueous medium of the aqueous dispersion to a hydrophilic organic medium under maintaining the dispersion.
摘要:
A vapor permselective membrane consisting essentially of an ion exchange membrane made of a fluorine-containing polymer having a fixed ion concentration of from 1 to 6N, a water content of from 20 to 250% by weight and an ion exchange capacity of from 0.6 to 2.5 meq/g dry resin, the ion exchange membrane having a thickness of from 0.1 to 300 .mu.m and a moisture content of from 1 to 10% by weight, the permselective membrane having a water vapor permeation rate of at least 50 m.sup.3 /m.sup.2.atm.
摘要:
An electrolytic cation exchange membrane which comprises a first film made of a fluorinated polymer having cation exchange groups and containing a fibrillated tetrafluoroethylene polymer and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups, said first film having a greater thickness and smaller specific electric resistance than said second film.
摘要:
A process for producing an anion exchange membrane, which comprises mixing from 25 to 95 mass % of a polymer having anion exchange groups or active groups convertible to anion exchange groups (hereinafter referred to as polymer 1), and from 5 to 75 mass % of a polymer having no anion exchange groups or no active groups convertible to anion exchange groups (hereinafter referred to as polymer 2), and forming the obtained composition into a membrane, said process including a step of cross-linking an aromatic ring of a repeating unit constituting polymer 1 with an aromatic ring of another repeating unit constituting polymer 1 or with a cross-linkable site of polymer 2, and in a case where polymer 1 is a polymer having active groups convertible to anion exchange groups, a step of converting the active groups to anion exchange groups.