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7625540 |
Fluorine removal by ion exchange
A method for removing fluorine gas from a selected environment comprises contacting the fluorine gas with water to generate a solution of hydrofluoric acid and contacting the solution of...
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7470413 |
Fluorine removal by ion exchange
A method for removing fluorine gas from a selected environment comprises contacting the fluorine gas with water to generate a solution of hydrofluoric acid and contacting the solution of...
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7459086 |
Method for treating water containing iron, manganese and arsenic
A method for treating water to produce potable water is described herein. The inventive method enables the efficient removal of iron, manganese, and arsenic without the addition of powerful...
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7431843 |
Process for the purification of silicone based solvents
An apparatus and process for removing impurities from silicone based solvents is presented. The apparatus and process use an adsorbent for removing contaminants from the solvent, and when the...
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7399416 |
Reactive filtration
In one embodiment, a reactive filtration method includes continuously regenerating a reactive filter media while simultaneously filtering contaminants from fluid flowing through the filter media....
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7390414 |
Regeneration of chemically treated zeolite
Systems and methods are provided for the removal and disposal of arsenic from an aqueous medium. The systems and methods include the removal of arsenic from a source by contact with either a...
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7273556 |
Method for treating water containing manganese
The invention concerns a method for treating water for human consumption, so as to eliminate manganese and possibly other metals comprising steps which consist in: causing said water to pass at...
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7273512 |
Process for drying difluoromethane
Process for drying wet F32, which comprises placing a stream of the said F32 in continuous contact with a feed stock of a composition comprising a molecular sieve chosen from a 3A type sieve, at a...
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7235180 |
Sulfate-selective anion exchange resins for use in combination with TRSS resins in feed water treatment
An improved system of resins comprising a combination of a sulfate-specific strongly basic anion exchange resin and a heterogenous hybrid thermally regenerable salt sorbent (TRSS) resin is...
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7198108 |
Changing the temperature of offshore produced water
Water that is produced during offshore hydrocarbon processing, such as hot produced water accompanying hydrocarbons taken from subsea reservoirs, or cold water resulting from heating LNG (liquified...
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7153434 |
Methods for removing contaminants from water and silica from filter media beds
The method for removing silicon dioxide from a contaminant-removal media bed comprises adding a scrub solution containing an acidic solution of sodium fluoride to a media bed containing silicon...
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7141173 |
In situ treatment process to remove metal contamination from groundwater
The present invention provides a process for enhancing the metal contaminant sorption capacity of mineral compounds within a groundwater-bearing formation by manipulating the pH and the surface...
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6878284 |
Method and apparatus of treating water containing a nitrogen compound
A method of treating water containing a nitrogen compound, and an apparatus of treating water containing a nitrogen compound at high speed without using a biologically unstable treatment causing...
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6833123 |
Method for liquid chromate ion and oxy-metal ions removal and stabilization
A method for removing at least one of chromate and other oxy-metal ions from liquid solutions includes contacting the liquid solution with solid barium compounds as adsorbents so that the at least...
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6827858 |
Method for separating alkali metal ions from alkoxylates
Alkali metal ions are separated off from alkoxylates containing alkali metal ions by a process comprising: a) dilution of the alkali metal-containing alkoxylate with an inert solvent, b) treatment...
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6790364 |
Process for stripping amine borane complex from an electroless plating solution
A process for separation and environmentally benign disposal of amine borane complexes includes adsorbing amine borane complex onto a solid support, treating the adsorbed amine borane complex with...
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6764603 |
Material for extracting hydrophobic components dissolved in water
A method for the extraction of hydrophobic constituents, such as benzene, toluene, xylene and/or chlorinated hydrocarbons, from an aqueous solution, involving the steps of contacting said solution...
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6736976 |
Fluid treatment process
A fluid treatment device for reducing the level of a chemical compound in a fluid. The device comprises: a fluid inlet; a fluid outlet; a flow-through fluid treatment zone having comprising: a...
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6719908 |
Phenol removal pretreatment process
A process for removing phenols from an aqueous solution is provided, which comprises the steps of contacting a mixture comprising the solution and a metal oxide, forming a phenol metal oxide...
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6696385 |
Method of preserving sulfonic acid-type cation-exchange resin modified with thiol-containing amine compound
The present invention aims at inhibiting a lowering in the modification ratio of a modified cation-exchange resin, in which part of the sulfonic acid groups have been modified with a...
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6676839 |
Process for continuous chemical separation
A process for removing a solute from a fluid process stream containing said solute and containing a solvent. The process comprises (a) continuously contacting the process stream with a portion of a...
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6652755 |
Simulated moving bed separation system
A simulated moving bed separation system is provided, in which a fluid circulation flow path can be washed for a short time. This system is provided with a circulation flow path having two or more...
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6632367 |
Method for separating heavy isotopes of hydrogen from water
Isotope water molecules, e.g., HTO and T 2 O, are separated from contaminated water by conveying the contaminated water through a separation chamber containing a separation material formed of an...
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6607651 |
Process and system for treating the discharge stream from an ion exchanger
A method is disclosed for treating a flushing solution from an ion exchanger used in electroplating operations by co-precipitating or selectively precipitating out metal hydroxides derived from...
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6563010 |
Adsorbent bed loading and regeneration
The process for removing impurities from a liquid by contact with a solid adsorbent using parallel contact adsorbent beds such that when one bed is contacting the liquid the parallel bed is being...
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6555007 |
Medium and method for binding chlorine gas
A fiber-based medium and method for binding chlorine gas utilizes sphagnum, a fibrous wetlands plant that is commercially available in dried form as sphagnum moss and sphagnum peat moss. It has...
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6521132 |
Ion exchange water softener and method
A self-regenerating ion exchange water softener has a lower tank for a resin chamber and an upper tank for a regenerative salt chamber, with an opening positioned between them, and with a...
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6503469 |
Method for processing polluted fluid containing pollutants
A polluted fluid, such as exhaust gas from a refuse incinerator, containing at least one pollutant, such as volatile organic compounds (VOCs), SOx or NOx, is processed by passing the polluted fluid...
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6454958 |
Method and device for operating etching baths
A method of operating a milling bath wherein a metal workpiece to be milled is immersed in a milling bath containing a milling medium, the metal oxidizing owing to a chemical reaction between the...
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6416670 |
Regenerable hydrocarbon filter
There is provided a process for removing hydrocarbons from hydrophilic solutions in which the adsorbent is regenerated in situ. A solution containing at least one hydrocarbon impurity is passed...
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6368510 |
Method and apparatus for the removal of arsenic from water
A method and apparatus for removing arsenic from water at point of entry or point of use particularly for residential application. The point of entry system comprises a first stage having a...
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6358421 |
Method for countercurrent regeneration of an ion exchange resin bed
An improved method for regenerating ion exchange resin in a treatment tank having a flow direction, which includes the steps of providing a supply of regenerant under pressure into the tank, and...
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6358396 |
Regeneration of anion exchange resins by catalyzed electrochemical reduction
Anion exchange resins sorbed with perchlorate may be regenerated by a combination of chemical reduction of perchlorate to chloride using a reducing agent and an electrochemical reduction of the...
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6334956 |
Adsorption or desorption of dissolved constituents in liquids and apparatus therefor
To adsorb, on solid adsorbent particles, constituents dissolved in liquid, or to desorb (extract), from solid desorbent particles, soluble constituents in liquid, in a container a packed bed formed...
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6334886 |
Removal of corrosive contaminants from alkanolamine absorbent process
A process is provided for removing CO 2 and/or H 2 S from a gas mixture containing as impurities CO 2 and/or H 2 S and at least one other impurity selected from the group consisting of a cyanide...
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6280625 |
In-situ remediation system for volatile organic compounds with deep recharge mechanism
A method and apparatus for the treatment and remediation of a contaminated aquifer in the presence of an uncontaminated aquifer at a different hydraulic potential. The apparatus consists of a...
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6270676 |
Process for removing ethers and/or polycyclic aromatic hydrocarbons from water containing them
A process for the removal of ethers and/or PAH's from water, such as contaminated groundwater, is provided that proceeds by initially separating off solid constituents and then adsorbing ethers and...
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6248382 |
Process for reducing the patulin concentration in fruit juices
A procedure for reducing the patulin content in a fruit juice which includes presenting the juice to a resin material having in abundance micropores of less than 20 Å minimum pore width and at...
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6245128 |
Process for the reclamation of spent alkanolamine solution
A process for the reclamation of spent aqueous alkanolamine solutions by contacting a spent aqueous alkanolamine solution with a strong base ion exchange resin for time sufficient to sorb from the...
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6200364 |
Process for eluting precious metals from activated carbon
A process is disclosed for the recovery of gold and/or silver values from activated carbon, wherein they are adsorbed as cyanide complexes. The process uses an eluant containing sugar. The process...
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6123851 |
Process for treating semiconductor fabrication reclaim
The hydrophilic organic contaminants and hydrogen peroxide present in semiconductor fabrication reclaims are removed by means of adsorption of a pyrolysate of a macroreticular sulphonated...
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6117331 |
Processes for the purification of waters containing organic constituents
Conventional regenerative adsorptive methods for the purification of waters of organic constituents are limited in their application, when owing to a low content of organic water constituents the...
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6113792 |
Method for removing contaminants from water using membrane filtration in combination with particle adsorption to reduce fouling
Heated iron oxide particles are combined with membrane filtration to remove contaminants from water. The use of the heated particles reduces fouling of the membrane typically encountered when...
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6080315 |
Process for the partial desalination of water
In a process for the partial desalination of water, especially of drinking water, with a mixture of weakly acid cation exchangers and strongly basic anion exchangers, whereby the charged ion...
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6063287 |
Removal of algae-associated odorants from fresh water
A process is disclosed for the removal of algae-associated odorant from fresh water by contacting such water with cyclodextrin and recovering the water so contacted.
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5989506 |
Process for the removal and recovery of mercury from hydrocarbon streams
The invention relates to a process for removing and recovering mercury, an impurity, from a hydrocarbon feedstream. The process comprises separating the hydrocarbon feedstream into a gaseous...
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5948264 |
Ion exchange and regeneration process for separation and removal of iron (III) ions from aqueous sulfuric acid metal ion-containing solutions
An ion exchange separation, recovery and regeneration process for the control of iron is disclosed that can replace the conventional bleed stream process used in copper electrowinning. The...
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5835865 |
Method and device for the disposal of a cation exchanger
A cation exchanger is loaded only with radioactive cations by repeatedly converting the non-bivalent, inactive cations into anionic complexes and flushing the complexes out of the cation exchanger....
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5820687 |
Method of separating acids and sugars using ion resin separation
A economically viable method for producing sugars using concentrated acid hydrolysis of biomass containing cellulose and hemicellulose is disclosed. The cellulose and hemicellulose in the biomass...
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5772891 |
Water treating method for treating waste water by using ion exchange resin
A water treating apparatus is provided which can treat waste water for use as raw water in an ultrapure water producing system without addition of various kinds of chemicals. The apparatus includes...
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