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5165919 |
Medical material containing covalently bound heparin and process for its production
A medical material comprising a high-molecular weight material and a heparin derivative is provided, which high-molecular weight material comprises a high-molecular weight compound having...
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5164139 |
Method for drying wetted molded product
A method for drying a wetted molded product of pasty high viscous composition which comprises subjecting the molded product to a dehydration process while wholly or partially contacting the product...
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5159130 |
Polysulfone membranes for aromatics/saturates separation
The present invention describes a method for separating mixtures of aromatics and non-aromatics into aromatic-enriched and non-aromatic-enriched streams by contacting the mixture with one side of a...
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5154829 |
Polyamide membrane with controlled surface properties
A method is provided for filtration of particulates from a fluid medium which includes passing the medium through a surface modified, skinless, hydrophilic, microporous, alcohol-insoluble polyamide...
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5152898 |
Separation of organic oxygenates
Concentration of solutions containing methanol and either dimethyl carbonate or methyl t-butyl ether may be effected by a composite membrane including a dibromobutane cross-linked poly(4-vinyl...
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5152901 |
Polyamine-polyamide composite nanofiltration membrane for water softening
A thin film composite (TPC) ultrafilter/hyperfilter water softening membrane on a microporous substrate is produced by an interfacial polymerization reaction between (1) an aqueous phase comprising...
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5149433 |
Method and apparatus for supply of decontaminated fuel to diesel engine
Apparatus for the supply of decontaminated fuel to a diesel engine including two filtering stages, the first being a spiral wound, cross flow ultrafiltration unit and the second being a spiral...
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5147553 |
Selectively permeable barriers
Apparatus and process for separating a fluid mixture into less permeable and more permeable fractions employing novel selectively permeable barriers comprised of a porous, emulsion treated...
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5146038 |
Process for treating a mixture containing dewaxed oil and dewaxing solvent
Charge containing dewaxed oil and dewaxing solvent (typically methyl ethyl ketone and toluene) is treated to separate dewaxing solvent by use of a separating membrane barrier of a polyurea.
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5139677 |
Membrane separation method
A solution of isopropanol or ethanol is concentrated by pervaporation across a membrane of polyurea polymer or polyamide polymer prepared by interfacial polymerization of (i) an amine monomer...
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5136032 |
Method for separating phosphopolyol compounds using a separating agent
A phosphopolyol compound, such as pyrogens, is separated from a solution to be used in the pharmaceutical field by bringing the solution into contact with a porous adsorbent which has a pore size...
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5133867 |
Reverse osmosis process for recovery of C.sub.3 -C.sub.6 aliphatic hydrocarbon from oil
Solvents comprising C 3 , C 4 , C 5 and C 6 aliphatic hydrocarbons (i.e. propane, propylene, butane, butylene, pentane, cyclopentane, pentene, hexane, cyclohexane, hexene and their isomers) and...
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5126503 |
Membrane process for dewatering lube oil dewaxing solvents
Water is separated from an MEK toluene dewaxing solvent by pervaporation through a poly(vinyl pyridine) membrane which has been cross-linked with 1,4-dibromobutane mounted on a polyacrylonitrile...
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5118424 |
Thin film composite membranes from vinyl and related nomomers
Novel thin film composite membranes are disclosed. They are prepared from vinyl and related monomers by phase transfer catalysis at the interface between one phase containing a polymerizable vinyl...
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5112491 |
Management of waste solution containing photoresist materials
The present invention relates to management of photoresist-resin-containing waste solution by feeding non-aged waste to a membrane device having a Desal-5 piperazine-based membrane modified to...
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5110473 |
Method and apparatus for sampling organic compounds in water
The subject invention is directed to an apparatus for removing organic compounds from water which comprises: a housing having an opening therein, the housing being capable of retaining an organic...
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5102550 |
Apparatus and process for desalination of seawater
An apparatus and process for desalination of seawater using a hydrophobic por permeable membrane. Heated seawater is passed across one surface of a membrane at rates which cause the flow to be...
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5102551 |
Membrane process for treating a mixture containing dewaxed oil and dewaxing solvent
Charge containing dewaxed oil and dewaxing solvent (typically methyl ethyl ketone and toluene) is treated to separate dewaxing solvent by use of a separating elastomer membrane barrier of a...
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5102552 |
Membranes from UV-curable resins
A composite membrane is disclosed having a microporous support which is coated with a UV curable polymer composition having a sufficiently high viscosity to prevent pore filling upon coating and...
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5098574 |
Membrane purification of solutions/suspensions of polyphosphazenes
Impure solutions or suspensions of the polyphosphazenes, e.g., those containing the reagents and/or byproducts of the chloro-substitution of a polydichlorophosphazene, are purified by contacting...
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5087372 |
Method for removing heavy metal ions from contaminated water and a porous membrane usable therefor
A method for simultaneously removing a plurality of different heavy metal ions from contaminated water is disclosed. A plurality of different heavy metal ions can be simultaneously, efficiently...
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5087367 |
Hydrolyzed membrane and process for the preparation of the same
A selectively water-permeable hydrolyzed membrane characterized in that it is mainly made of a material which can generate a carboxyl group by hydrolysis and that a part of the material is...
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5084182 |
Method for manufacturing of multilayer reverse osmosis membrane of polyamide-urea
The present invention is directed to methods for using an improved reverse osmosis membrane that shows surprisingly improved solute rejection and permeation properties. The membrane includes a...
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5080795 |
Supported chiral liquid membrane for the separation of enantiomers
The invention relates to a process for the high yield, cost efficient means of separating enantiomers. The process utilizes a supported liquid membrane and a chiral carrier which selectively...
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5075011 |
Composite semipermeable membrane created by precipitation of emulsion polymers onto base film microporous surfaces
A composite semipermeable membrane having improved chlorine tolerance, produced by employing the development of a thin film polymer layer by precipitation of the polymer at the interface of an...
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5071448 |
Semipermeable membranes based on certain sulfonated substituted polysulfone polymers
Semipermeable membranes comprised of certain sulfonated substituted polysulfone polymers containing the polymer repeat unit (A) or (B) as herein defined. The invention also pertains to processes...
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5061374 |
Reverse osmosis as final filter in ultrapure deionized water system
An improved deionized water treatment system and method that consists of using a first and second water treatment train wherein the second train improves water quality by reducing particulate and...
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5055631 |
Sulfonated polysulfone membranes for aromatics/saturates separation
The present invention describes a method for separating mixtures of aromatics and non-aromatics by permeation through a sulfonated polysulfone membrane which is selective for aromatics.
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5051178 |
Process of producing composite semipermeable membrane
Alkyldiamine, 1,3,5-trihydroxybenzene or 1,3-dihydroxybenzene is added as a copolymerization component to a polyfunctional aromatic amine component in the amount of 1-20% by weight with respect to...
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5049282 |
Semipermeable composite membranes
Semipermeable composite membranes composed of a porous substrate and at least two layers of film-forming polymers coated thereon are provided, which comprise a first layer of monomeric or polymeric...
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5049281 |
Multi-block polymer comprising a first prepolymer, made by combining epoxy with diamine, chain extended with a compatible second prepolymer, the membrane made therefrom and its use in separations
The present invention is directed to a multi-block polymeric material comprising a first prepolymer, made by combining epoxy with diamine, chain extended with a second, different compatible...
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5039421 |
Solvent stable membranes
A composite membrane for separating at least one dissolved or suspended component from a liquid phase, and characterized by solvent stability, comprises: (A) a substrate microfiltration,...
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5037556 |
Membrane separation of N-methyl pyrrolidone/middle distillate streams
An N-methyl pyrrolidone-containing middle distillate stream is separated by use of a polyethyleneimine membrane which has been cross-linked with a polyisocyanate or a poly(carbonyl chloride)...
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5037555 |
Desalination of water
Desalination of water is effected by use of a polyimine membrane which has been cross-linked with a combination of aliphatic and aromatic polyisocyanate or with a polycarbonyl chloride...
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5034134 |
Treatment of impurity-containing liquid streams in ethylene oxide/glycol processes with semi-permeable membranes
A method is disclosed for separating impurity components, UV absorbers and/or UV absorber precursors contained in an ethylene glycol-water stream thereby desirably allowing the recovery of the...
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5032281 |
Separating membrane and separation method
A separating membrane having a porous membrane structure with a pore size distribution such that the membrane does not permeate 90 percent or more of particles having a size of 0.5 micron when the...
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5032282 |
Solvent-stable semipermeable composite membranes
Semipermeable composite membranes which comprise a porous substrate of a homo- or copolymer on the basis of acrylonitrile are provided, which have been cross-linked, and at least two layers of...
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5028337 |
Coated membranes
Composite membranes are provided comprising an underlying membrane selected from the group consisting of microfiltration, ultrafiltration and reverse osmosis membranes; and a coating thereon...
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5024765 |
Composite membranes and processes using them
A composite membrane which comprises: (a) a porous semipermeable membrane substrate; and (b) a coating superimposed thereon which includes at least one member selected from: monomers...
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5022996 |
Method of separating organic contaminants from fluid feedstreams with polyphosphazene membranes
A method is provided for separating halogenated hydrocarbons from a fluid feedstream. The fluid feedstream is flowed across a first surface of a polyphosphazene semipermeable membrane. At least one...
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5019260 |
Filtration media with low protein adsorbability
A porous polymeric medium having a low affinity for amide group-containing and adjuvant-containing materials is provided comprising a porous polyvinylidene difuoride substrate and a...
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5019666 |
Non-porous polycarbonate membranes for separation of aromatics from saturates
The present invention is a method for separating aromatics from saturates using a non-porous polycarbonate membrane. In a preferred embodiment, the polycarbonate membrane may be crosslinked.
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5012036 |
Polyarylate membranes or aromatics/saturates separation (C-2415)
The present invention describes a method for separating mixtures of aromatics and non-aromatics into aromatic-enriched and non-aromatic-enriched streams by contacting the aromatic/non-aromatics...
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5012035 |
Polyphthalatecarbonate membranes for aromatics/saturates separation
The present invention describes a method for separating mixtures of aromatics and non-aromatics into aromatic-enriched and non-aromatic-enriched streams by contacting the mixture with one side of a...
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5008352 |
Substituted aromatic polymers
An aryl-ether and/or thioether polymer contains aromatic rings linked to neighboring units Ph X Ph (when Ph is paraphenylene and X is SO 2 and/or CO) through O and/or S and/or a direct link, at...
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5008189 |
Enhanced membrane separation of monosaccharides utilizing concentration polarization
Membrane separation of monosaccharides from an aqueous solution containing higher saccharides and saccharifying enzyme is considerably improved when the separation is performed under conditions...
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5004861 |
Process for pervaporization using membrane separating means
Water is separated from an MEK toluene dewaxing solvent by pervaporation through a polyvinyl alcohol membrane (optionally containing polyacrylic acid) mounted on a polyacrylonitrile support layer.
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4992176 |
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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4988443 |
Bioreactor process for continuous removal of organic toxicants and other oleophilc solutes from an aqueous process stream
A hollow fiber membrane bioreactor process for continuous selective removal of organic toxicants or other oleophilic solutes present in an aqueous process stream wherein low concentration levels of...
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4978455 |
P-xylylenediamide/diimide composite RO membranes
Composite RO membranes having good resistance to halogen attack and high fluxes are disclosed, the composite membranes comprising a microporous polymeric support with an interfacially polymerized...
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