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5626761 |
Chemical and particulate filtration system/apparatus
A chemical and particulate filtration system and method are disclosed. The method includes contacting a liquid to be filtered, in a reverse flow manner, with a molecular absorption filter media and...
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5618433 |
Processes for separating and concentrating certain ions from mixed ion solutions using ion-binding ligands bonded to membranes
A method for removing, separating, and concentrating certain selected ions from a source solution that may contain larger concentrations of other ions comprises bringing the source solution in...
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5616249 |
Nanofiltration apparatus and processes
Improved nanofiltration apparatus and processes utilizing thin film composite asymmetric nanofiltration membranes in which the thin film semi-permeable barrier layer consists of substantially "all...
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5531900 |
Modification of polyvinylidene fluoride membrane and method of filtering
There is provided a filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing a positively charged organic phosphonium compound grafted to the membrane in a...
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5522995 |
Process for recovering organic acids from aqueous salt solutions
A crude aqueous mixture of basic salts of an organic acid, free organic acid, and impurities is mixed with carbon dioxide under pressure and applied to a membrane such as a reverse osmosis or other...
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5508196 |
Method of continuously preparing a sterile culture medium
A method for continuously preparing a sterile culture medium comprises combining separate unsterilized fluid components in separate streams into a single mainstream. The mainstream is applied to a...
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5506333 |
Polyesters for use in blood partitioning
A polyester is provided which facilitates the separation of blood into light and heavy phases via centrifugation in a blood collection vessel. The polyester is useful as a component of a...
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5492625 |
Method of recovering carboxylic acids from dilute solutions
A method for recovering carboxylic acids from a dilute aqueous solution thereof having a concentration below about ten percent (10%) by weight, which includes passing the dilute acid solution...
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5491259 |
Process to produce aminocarboxylic acids containing low residual salt
A method for producing an aqueous solution of an aminocarboxylic acid from an aqueous solution of an alkali metal salt of the aminocarboxylic acid is disclosed. The first step of the method is to...
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5484531 |
Process for the removal of inorganic salts
The intention is a process for removing inorganic salts from aqueous mixtures of organic compositions capable of forming micelles. The aqueous mixture is subjected to ultrafiltration to remove the...
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5482634 |
Purification of aqueous reaction or washing medium containing cellulose ethers
In a process for purifying an aqueous liquid reaction and/or washing medium containing i) hot water-insoluble cellulose ethers and ii) hot water-soluble cellulose ethers and/or macromolecular...
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5462667 |
Filter for liquor filtration
A filter and process of using the filter for the filtration of liquor cerebrospinalis, the filter has a membrane filter layer having a pore size of from 0.04-0.45 μm a thickness of 0.1 to 1 mm, a...
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5456843 |
Microfiltration and/or ultrafiltration membrane, method of preparation and method of filtration by means of such a membrane
The invention relates to a microfiltration and/or ultrafiltration membrane consisting of a polymer having nominal pores of 0.001-10 μm. The special feature of the membranes according to the...
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5433861 |
Permanent deformation and use of sulfonated halopolymer articles
This invention relates to the preparation of, and a device for using, a permanently deformed sulfonated halopolymer article. A flexible and non-brittle flange may be formed from at least one end of...
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5429748 |
Polymide membrane for separation of solvents from lube oil
An improved asymmetric membrane fashioned from a polyimide for the liquid separation of solvents from lube oil. The membrane is based on a fully imidized polymer based on...
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5407581 |
Filter medium having a limited surface negative charge for treating a blood material
Disclosed is a filter medium for treating a blood material selected from the group consisting of a leukocyte-containing suspension and plasma, comprising a polymeric, porous element having, in a...
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5401499 |
Method of adsorbing pyrogens
An insoluble material for adsorbing a pyrogen comprising a polymer of an aziridine compound. According to the present invention, a large mount of the pyrogen can be easily removed from a solution...
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5387405 |
Bayer liquor polishing
A secondary polishing process for Bayer Process liquors suspension is described. The polishing process uses a combination of bio-polymers, particularly such bio-carbohydrates as dextran, with an...
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5350521 |
Process for separating catalysts from organic solutions, by means of semipermeable membranes
Disclosed is a process for separating metal catalysts based on ammonium and phosphonium phosphotungstates from reaction mixtures in which they are dissolved. The process is based on the use of...
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5338456 |
Water purification system and method
A water purification process for removing dissolved solids of the type that are normally present in a municipal water supply or the like. The process uses a forced draft decarbonator having an...
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5338455 |
Process for the separation of components in an organic liquid medium and a semi-permeable composite membrane therefor
A semi-permeable composite with a porous substrate having a polymer network obtained by interfacial polymerization of a reactive polyfunctional monomer having reactive groups --NHR. (R 1 is H or a...
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5318706 |
Method of supplying dilute hydrofluoric acid and apparatus for use in this method for supplying the acid
A method of preparing hydrofluoric acid of high purity at the point of use by causing molecular diffusion of hydrogen fluoride into ultrapure water through a resin membrane. The high-purity acid is...
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5294342 |
Composite porous membranes
The composite membrane is disclosed having a microporous support which is coated with an aqueous polyeurethane dispersion composition wherein the microporous support is surface treated. A process...
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5290452 |
Crosslinked polyester amide membranes and their use for organic separations
The present invention is directed to a polyester/amide membrane, its preparation and its use for organic liquid separation. The polyester/amide membrane is made by reacting a dianhydride with a...
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5282971 |
Positively charged polyvinylidene fluoride membrane
A filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing positively charged quaternary ammonium groups covalently bonded to the membrane, and a method of...
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5281337 |
Membrane separation process
Membrane separation process is improved by use, as a support membrane, of (i) a polyacrylonitrile membrane on which at least a portion of the surface --CN groups have been hydrolyzed to --COOH...
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5275738 |
Filter device for acids and process for filtering inorganic acids
A PVDF membrane exposed to a quarternary ammonium hydroxide solution retains it hydrophobicity and resistance to corrosive environments, yet spontaneously and completely wets with concentrated...
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5274047 |
Semipermeable composite membrane, a process for the manufacture thereof, as well as application of such membranes for the separations of components in an organic liquid phase or in the vapor phase
Semipermeable composite membrane, with a porous carrier substrate, whereby said carrier substrate is provided with a polymer network obtained by polycondensation, especially interfacial...
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5273657 |
Process for preparing modified porous membrane
A modified porous membrane can be prepared by dissolving an aromatic polymer having a thioether group in an organic solvent, forming membrane of the aromatic polymer from the resultant solution by...
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5271843 |
Chlorine-tolerant, thin-film composite membrane
A semipermeable membrane suitable for reverse osmosis applications is prepared by interfacially reacting on a support an aromatic polyamine containing at least three and, preferably, four aromatic...
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5265734 |
Silicon-derived solvent stable membranes
A composite membrane comprises a substrate made from a polymer selected from copolymers and homopolymers of ethylenically unsaturated nitriles, which substrate has preferably first been treated...
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5262054 |
Process for opening reverse osmosis membranes
The salt passage of a reverse osmosis membrane is increased by: (a) contacting the membrane with ions to form a membrane-ion complex; (b) treating the membrane-ion complex with an aqueous solution...
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5262056 |
Polyamides and polypyrrolones for fluid separation membranes
Polyamide and polypyrrolone membranes for fluid separation having desirable permeabilities, solubilities, diffusivities,, high glass transition temperatures and large fractional free volumes. In...
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5259972 |
Apparatus and method for purifying water
In an apparatus and method for purifying water, an oxidation forcibly turns colloidal substances into fine particles of oxides, thus increasing the size of the particles. The effluent of oxidation...
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5254261 |
Interfacially synthesized reverse osmosis membranes and processes for preparing the same
Water permeable reverse osmosis membranes are prepared by interfacially polymerizing on a microporous support an essentially monomeric polyamine reactant having at least two amine functional groups...
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5252222 |
Filter for parenteral systems and method of using thereof
A filter device and method are provided for treating parenteral nutrient fluids, particularly TNA systems containing lipids, glucose, and amino acids. The filter device comprises a housing and a...
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5250185 |
Reducing aqueous boron concentrations with reverse osmosis membranes operating at a high pH
A method of treating an aqueous charge liquid, such as oilfield produced waters, containing boron and solubilized hydrocarbon compounds to reduce boron concentration, which comprises water...
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5244578 |
Blood plasma-separating membrane and blood plasma separator using the membrane
A blood plasma-separating membrane formed of a porous membrane possessing a wetting time in the range of 3 to 500 seconds relative to water and a non-priming grade blood plasma separator using the...
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5240591 |
Membrane process for separating a mixture containing dewaxed oil and dewaxing solvent
A charge containing dewaxed oil/dewaxing solvent may be treated to effect separation of components by a thermally cross-linked hydrocarbon-derived elastomer membrane, typified by polybutadiene.
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5238573 |
Separation of organic liquids
Mixtures containing methanol and dimethyl carbonate or methanol and methyl t-butyl ether may be treated by pervaporation to recover product containing decreased quantity of methanol.
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5238570 |
Asymmetric semipermeable membranes of aromatic polycondensates, processes for their preparation and their use
Asymmetric semipermeable membranes which consist of aromatic polycondensates having recurring units of the formula (--O--Z--O--Y--) n (I) in which Y is the...
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5234598 |
Thin-film composite membrane
A thin-film seimpermeable composite membrane employs the reaction product of N-alkyl phenylenediamine or N,N'-dialkyl phenylenediamine and a poly acyl halide, such as trimesoyl chloride. Preferably...
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5221485 |
Purification of X-ray contrast agent, magnetic resonance imaging agent, or radiopharmaceuticals using reverse osmosis
The use of reverse osmosis as an alternative or substitute method for the purification of a crude diagnostic agent. X-ray contrast agent, magnetic resonance imaging agent, or radiopharmaceuticals...
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5194159 |
Treatment of lower glycol-containing operative fluids
Operative fluids containing lower glycol are contacted with semi-permeable membranes under reverse osmosis conditions to permeate lower glycol to provide a reclaimed lower glycol product. Exemplary...
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5192445 |
Membrane suitable for the dehydration of organic oxygenates
Concentration of aqueous solutions of isopropanol may be effected by a composite membrane including a dibromobutane cross-linked poly(4-vinyl pyridine) bonded to a porous layer of polyacrylonitrile...
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5182024 |
Separation of hydrocarbon dewaxing and deasphalting solvents from dewaxed and/or deasphalted oil using interfacially polymerized membrane
Hydrocarbon solvents used or the dewaxing and/or deasphalting of oils can be recovered by the selective permeation of said solvents through an interfacially polymerized membrane under reverse...
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5180496 |
Unsaturated polyesters and crosslinked membranes therefrom for aromatics/saturates separation
The present invention describes a method for the synthesis of unsaturated aliphatic polyesters, their crosslinking by thermal treatment and the use of the corresponding crosslinked membranes to...
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5178766 |
Composite semipermeable membrane, process of producing the same and method of producing highly pure water using the same
A composite semipermeable membrane which has a high electrolytes rejection even when the concentration of the electrolytes in feed water is very low and even if the pH of feed water is not less...
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5177296 |
Saturated polyesters and crosslinked membranes therefrom for aromatics/saturates separation
The present invention describes a method for the synthesis of saturated aliphatic polyesters by reaction of saturated or aromatic diacid chlorides with oligomeric aliphatic polyester diols, a...
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5173191 |
Interfacially polymerized membranes for the reverse osmosis separation of organic solvent solutions
Interfacially polymerized, crosslinked membranes on microporous, organic solvent resistant ultrafiltration membrane backing are useful for the separation of organic mixtures under reverse osmosis...
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