Matches 201 - 250 out of 306 < 1 2 3 4 5 6 7 >
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4678477 Process for lowering level of contaminants in Bayer liquor by membrane filtration  
A system is disclosed for the purification of a caustic solution to remove impurities therefrom comprises: bringing the caustic solution into contact under pressure with the outside of a plurality...
4676959 Bayer process for producing aluminum hydroxide having improved whiteness  
A process for producing aluminum hydroxide product having an improved level of whiteness is disclosed. In the process, a caustic solution having dissolved aluminum hydroxide is subjected to...
4668706 Substituted aliphatic polyamide porous membranes  
Aliphatic thermoplastic polyamide porous membranes are reacted with an acid halide of basicity above one to provide acid radicals within the membrane. The acid halide may be derived from an...
4663050 Semipermeable membranes prepared from polymers containing adjacent, pendent carboxy groups  
Semipermeable membranes useful for separating mixtures of ethanol and water into enriched fractions of each are prepared by cross-linking 50-90 weight percent of at least one polymer containing...
4661526 Cross linked porous membranes  
A polymeric porous membrane having a matrix made from an aliphatic thermoplastic polyamide or from an aliphatic thermoplastic polyamide/polyimide copolymer which has both relatively non-crystalline...
4659475 Composite reverse osmosis membrane comprising crosslinked poly(amine-epihalohydrin adduct)  
A composite reverse osmosis membrane which can be used to separate a solvent, generally water, from solutes dissolved therein, can comprise a flexible microporous support with a thin film membrane...
4634531 Membrane treatment method for semipermeable membranes  
The present invention relates to the membrane treatment method for semipermeable membranes, that is, a method wherein it is characterized that not only remarkable improving effect of selective...
4608172 Plasmapheresis membrane and process for the preparation thereof  
Plasmapheresis membranes of hydrophilic polycarbonates are disclosed, comprising polycondensates of bisphenol A and a polyalkylene oxide. These membranes which have a regular pore structure with...
4591440 Membranes for liquid separations  
Provided is a membrane for liquid separation which comprises mainly poly(substituted acetylene) having a repeating unit represented by the following formula: ##STR1## wherein R 1 represents a...
4584103 Reverse osmosis of ultrafiltration modified polyacrylonitrile-containing membrane  
Modified, polyacrylonitrile-containing membranes suitable for ultrafiltration are prepared by reacting polyacrylonitrile or copolymers of acrylonitrile and other ethylenically unsaturated monomers...
4563516 Polyether-polycarbonates for dialysis membranes  
The present invention relates to a process for the preparation of polyether-polycarbonates, a process for stabilizing the polyether-polycarbonates thus prepared, a process for the production of...
4529646 Production of composite membranes  
A process is disclosed for producing a composite reverse osmosis membrane. The process involves forming a porous polysulfone membrane from a solution of polysulfone followed by quenching the...
4527999 Separation membrane and method of preparing and using same  
A differential pore-collapsed separation membrane particularly useful as a gas-separation membrane and a method of preparing such differential pore-collapsed membrane, which method comprises...
4511654 Production of high sugar syrups  
The preparation of syrups which contain a high glucose or maltose content may be effected in a two-step process. In the first step, a feedstock such as starch which has been pretreated with...
4465492 Process for the preparation of concentrated aqueous formulations of synthetic anionic dispersants and the use thereof  
In a process for the preparation of concentrated aqueous formulations of synthetic anionic dispersants, dilute reaction solutions of said dispersants are subjected to reverse osmosis using...
4459361 Ligand assay with one or two particulate reagents and filter  
Method of making and using products for analysis of specific ligands in solution. More specifically, a method of analyzing a sample for a ligand by incubating the sample with a ligand selective...
4415455 Reverse osmosis membranes based on hydroxyalkyl methacrylate and methacrylic acid copolymers  
Good salt rejection, flux characteristics and resistance to degradation are obtained with semi-permeable reverse osmosis membranes made by coating a microporous substrate with a copolymer of a...
4392960 Process for the removal of urea from aqueous solutions  
A process for the removal of urea from an aqueous solution containing same, which comprises subjecting the solution to reverse osmosis through a polymeric membrane prepared from a polymer of the...
4383923 Semipermeable membranes  
Semipermeable composite membranes consisting of a microporous substrate and a semipermeable layer built of polymer material containing urazole structures.
4366062 Reverse osmosis using a composite isocyanurate membrane  
A method for the selective separation of at least one water-soluble useful material from an aqueous solution by reverse osmosis is provided. The method comprises contacting the aqueous solution...
4353802 Semipermeable composite membrane  
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of a microporous substrate, the polymeric material being prepared by...
4347139 Membrane for reverse osmosis and method of making the same  
A membrane for reverse osmosis comprising a porous base and a thin high polymer film attached to the porous base. The high polymer film includes at least one layer of radical polymer of nitrogen...
4308145 Relatively thick polycarbonate membranes for use in hemodialysis  
Membranes for hemodialysis prepared from polycarbonate materials have superior transport properties for middle molecular weight molecules than do cellulosic membranes while maintaining...
4305823 Semipermeable membranes from modified polymers  
Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, copolymers with vinyl esters and homopolymers and copolymers of...
4302336 Semipermeable composite membrane  
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of a microporous substrate, said polymeric material being prepared by...
4280970 Polyoxyethylene grafted membrane materials with grafting links derived from a diisocyanate  
Membrane forming polymers are converted to hydrophilic polymeric membranes by (a) grafting a polyoxyethylene chain to a membrane forming polymer structure and thereafter forming a membrane; (b)...
4278548 Control of biological growth in reverse osmosis permeators  
Process for the control of bacterial growth in polyamide reverse osmosis membranes by treatment with iodide, hydrogen peroxide, or hydrogen peroxide derivatives.
4277344 Interfacially synthesized reverse osmosis membrane  
Good salt rejection and flux characteristics can be obtained with reverse osmosis membranes made from crosslinked, interfacially polymerized aromatic polyamides, particularly poly(arylenepolyamine...
4265745 Permselective membrane  
A permselective membrane comprising a thin permselective film of a polymeric material, said polymeric material being prepared by cross-linking a polyaddition product between a polyepoxy compound...
4259183 Reverse osmosis membrane  
A composite permselective membrane is prepared by reaction of a film or layer containing cycloaliphatic polyfunctional secondary amines with a triacyl halide or its mixture with a diacyl halide....
4252652 Process of using a semi-permeable membrane of acrylonitrile copolymers  
A disulphimide group-containing acrylonitrile copolymer semi-permeable membrane which comprises: (A) from 99 to 50% by weight of acrylonitrile units; (B) from 1 to 50% by weight of units of...
4250029 Coated membranes  
Novel membranes having two or more coatings of polyelectrolytes with at least one oppositely charged adjacent pair of coatings separated by a neutral layer to reduce charge neutralization, their...
4246366 Mixtures of glycidylated hydantoins and polyhydric phenols and the use thereof for the preparation of plastics  
Mixtures of approximately equivalent amounts of (a) a glycidylated hydantoin and (b) a mononuclear phenol with 2 or 3 phenolic hydroxyl groups, at least one of the components (a) or (b) being...
4244817 Process for producing semipermeable membrane  
A process for preparing a semipermeable membrane, which comprises contacting a thin polyamine film applied to a liquid-permeable microporous substrate with a polyalicyclic diisocyanate or...
4242208 Semipermeable composite membrane and process for preparation thereof  
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of the microporous substrate, said polymeric material being prepared by...
4235714 Hydrophilic polyamide film for semipermeable membranes  
Semipermeable membranes useful in membrane separation processes are formed from a hydrophilic polyamide which is a block copolymer of nylon and a poly(dioxa-amide) such as...
4229297 Method of separating oil from oil-containing liquid  
A specific porous membrane is found to be extremely useful for permeation-separation of an oil from an oil-containing emulsion. By contacting a stable oil-containing emulsion of either water-in-oil...
4201664 Ultrafiltration or reverse osmosis treatment of emulsified oil metal working coolants  
A portion of the oil-in-water emulsion used as a lubricant/coolant in the shaping of metal articles such as containers is subjected to a reverse osmosis or ultrafiltration process to concentrate...
4199448 Reverse osmosis membrane of high urea rejection properties  
Polymeric membranes suitable for use in reverse osmosis water purification because of their high urea and salt rejection properties are prepared by generating a plasma of an unsaturated hydrocarbon...
4100064 Purification of water by reverse osmosis using a supported semi-permeable membrane  
Water is purified by reverse osmosis using a semi-permeable membrane supported by the outer surface of an extruded tube of water-permeable rigid p.v.c. so that impure water is recovered from the...
4086215 Crosslinked organic polyamide or polyhydrazine permselective polymeric membranes  
Permselective membranes are prepared by crosslinking synthetic organic polyamides or polyhydrazides having --CO 2 H groups and/or --SO 3 H groups with a salt of metal selected from the class...
4075093 Process of separating citric acid and/or isocitric acid or their salts from aqueous solutions  
The process of separating citric acid and/or isocitric acid and their salts from aqueous solutions containing said acids or their salts, and especially from fermentation solutions, consists in...
4073724 Anisotropic phenolic polyether membrane  
Anisotropic membranes particularly useful in reverse osmosis because of their good salt rejection properties and high transmission rate are provided which consist essentially of a polymer...
4067805 Process for separating aqueous formaldehyde mixtures  
Process for the separation of water from mixtures of water and formaldehyde, by contacting the mixtures against an organic polymeric membrane, and withdrawing at the other side of the membrane a...
4067804 Solute-separating membrane  
A solute-separating membrane consisting of a polyoxadiazole series resin containing at least one of the structural units of formulae: ##STR1## wherein Ar and Ar' are same or different multivalent...
4054707 Sulphonated polyaryl-ether-sulphones and membranes thereof  
Novel sulphonated polyaryl-ether-sulphone resins are described which are particularly suitable for producing semi-permeable membranes, in particular for reverse osmosis. These resins consist...
4045337 Asymmetric, semipermeable membranes of cyclic polyureas  
Asymmetric, semipermeable membranes of polyhydantoins or polyparabanates.
4040834 Regeneration of photographic processing solutions  
Image intensifying solutions containing cobalt (III) complex salts can be regenerated through concentration by means of reverse osmosis.
4036748 Asymmetric, semipermeable membranes of polybenz-1,3-oxazine diones-(2,4)  
An asymmetric semipermeable membrane of a homo- or co-polybenz-1,3-oxazine dione-(2,4).
4032440 Semipermeable membrane  
A semipermeable composite membrane is prepared by glow discharge polymerization of a combination of an organic monomer and an inorganic monomer in the presence of a porous support, the...
Matches 201 - 250 out of 306 < 1 2 3 4 5 6 7 >