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Topic: Ion-exchange

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Ion exchange resin - Wikipedia, the free encyclopedia An ion exchange resin is an insoluble matrix (or support structure) normally in the form of small (1-2mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate on the surface of which are sites with easily trapped and released ions in a process called ion exchange. Ion exchange resins do not remove chlorine or organic contaminants from water - this is usually done by using an activated charcoal filter mixed in with the resin. The salt is used to recharge an ion exchange resin which itself is used to soften the water so that limescale deposits are not left on the cooking and eating utensils being washed. en.wikipedia.org /wiki/Ion_exchange_resin   (602 words)

Ion exchange - Wikipedia, the free encyclopedia Ion exchange is a process in which ions are exchanged between a solution and an ion exchanger, an insoluble solid or gel. Typical ion exchangers are ion exchange resins, zeolite, montmorillonite, clay, and humus. Ion exchange is a reversible process and the ion exchanger can be regenerated or loaded by washing with an excess of the ions to be exchanged. en.wikipedia.org /wiki/Ion_exchange   (113 words)

Ion Exchange As concentrations increase, ion exchange becomes impractical due to the increasing frequency of regenerations and the declining difference between the concentration of the regenerant which is a constant (typically 5-10 grams/liter) and the concentration of the stream being treated. Ion exchange is a chemical reaction wherein an ion from solution is exchanged for a similarly charged ion attached to an immobile solid particle (i.e., ion exchange resin). The basic ion exchange column consists of a resin bed which is retained in the column with inlet and outlet screens, and service and regeneration flow distributors. www.pwbrc.org /bmr/ix.htm   (1500 words)

Properties of Ion Exchange Resins An ion exchange resin that is highly crosslinked is quite resistant to the diffusion of various ions through it and hence, the time required to reach equilibrium is much longer. The second is called internal diffusion and is the movement of ions from the surface to the interior of an ion exchange particle. Ion exchange reactions are reversible reactions with equilibrium conditions being different for different ions. www.rpi.edu /dept/chem-eng/Biotech-Environ/IONEX/resin.html   (808 words)

Ion Exchange When water to be treated passes through the ion exchange unit, ions in the water are attracted by either a positive or a negative charge to the ions in the resin bed. Since the ions from within the water are usually attracted more strongly to the resins than they were held in the water, they are in effect removed from the water in the exchange process. The most common example of an Ion exchange unit is a water softener, which are primarily used to remove calcium, magnesium and low quantities of barium, cadmium, copper, iron, manganese, radium, zinc, and other metallic, positively-charged ions. www.qh2o.com /ion_exchange.htm   (1571 words)

Water Purification, Hardness Correction, Ion Exchange, The Pump House Educational Series The ion exchange process in a water softener is an exchange of positively charged cations in which calcium and magnesium are exchanged for sodium. The direction of the exchange depends upon the affinities of the ion exchanger for the ions present and the concentrations of the ions in the solution. When the resin is installed in the resin tank and hard water containing calcium and magnesium ions passes down through the deep column of resin beads (the resin bed), the sodium ions are exchanged for the magnesium and calcium ions. www.pumphousebc.com /ion_exchange_filtration.html   (480 words)

Ion Exchange For ion exchange water softeners, the capacity is expressed in grains of hardness removal between successive regenerations and is related to the pounds of salt used in regeneration. The vertical distance between a bed of filter media or ion exchange material and the overflow or collector for backwash water, the height above the bed of granular media available for bed expansion during backwashing; may be expressed either as a linear distance or a percentage of bed depth. Ion exchange process in which cations in solution are exchanged for other cations from an ion exchanger. xnet.rrc.mb.ca /rcharney/Ion_Exchange.htm   (2551 words)

4-48 Ion Exchange Ion exchange removes ions from the aqueous phase by the exchange of cations or anions between the contaminants and the exchange medium. Ion exchange materials may consist of resins made from synthetic organic materials that contain ionic functional groups to which exchangeable ions are attached. Ion exchange removes ions from the aqueous phase by exchange with counter ions on the exchange medium. www.frtr.gov /matrix2/section4/4-49.html   (683 words)

Oilfield Glossary: Term 'ion exchange' Ion exchange is the basis for clay peptization, which can improve a poorly performing clay. A process of exchanging one ion for another ion on a charged, solid substrate, such as a natural clay, zeolite or resin. See: beneficiation, cation, cation-exchange capacity, clay, clay-water interaction, hardness ion, methylene blue test, peptization, resin www.glossary.oilfield.slb.com /Display.cfm?Term=ion+exchange   (150 words)

Ion Exchange In ion exchange, the stationary phase is a bead or resin with a fixed charge. In ion exchange chromatography, molecules are separated based on their charge. · Ion exchange chromatography is used primarily to purify proteins. academics.vmi.edu /chem_aa/CH402/experiments/ion_exchange.htm   (1075 words)

Ion Exchange Chromatography by Angela Crane Ion exchange chromatography requires a matrix that allows for the exchange of counter-ions for other ions without altering the matrix. Pharmacia Fine Chemical reports the way in which ion exchange works is by "separating molecules differing in charges carried by solute molecules (Pharmacia 3)." Since different substances have different affinities for the ion exchanger, separation occurs due to differences in the charge of these particular substances. The separation part of ion exchange chromatography is obtained by reversible adsorption usually in two main stages. www.samford.edu /~gekeller/crane.html   (471 words)

ION EXCHANGE CHEMISTRY AND OPERATION Ion exchange is a reversible chemical reaction wherein an ion (an atom or molecule that has lost or gained an electron and thus acquired an electrical charge) from solution is exchanged for a similarly charged ion attached to an immobile solid particle. Ion exchange resins are classified as cation exchangers, which have positively charged mobile ions available for exchange, and anion exchangers, whose exchangeable ions are negatively charged. Because the quantity of H+ and OH ions is balanced, the result of the ion exchange treatment is relatively pure, neutral water. www.remco.com /ix.htm   (3013 words)

Ion Exchange Ion exchange columns are at the center of our reliable PLC based flow control system that can be either semi-automatic or a fully automated operation. ION exchange columns are at the center of our reliable PLC based flow control system that can be either semi-automatic or a fully automated operation. ION Exchange technology has been in limited use for years, primarily for the generation of de-ionized water. www.lhwinc.com /ionexchange.htm   (533 words)

Gold Recovery from cyanide liquors Ion exchange resins are more versatile substrates than activated carbons because specific functional groups can be fixed on the resin matrix during the synthesis. Because of the high capacity available with ion exchange resins and the high loading that can therefore be obtained, in most small scale operations it is often an option to consider incineration of the loaded resin rather than elution. The pregnant solution is commonly contacted with beds of activated-carbon or anionic ion exchange resin that adsorb the gold. www.rohmhaas.com /ionexchange/IP/gold_recovery.htm   (596 words)

Untitled Document Ion exchange is a process that includes two very similar applications of the same technology. The ions in the water attach themselves to the resin, and knock off the ions that are already attached. The ions in the water are attracted to the resin. www.puritech.be /English/Ionexchange.asp   (272 words)

Chemviron Carbon Engineered Solutions: Ion Exchange and Chromatography Ion exchange is a reversible chemical reaction in which one type of ion (electrically charged atoms or molecules) is exchanged for another. Although continuous ion exchange and continuous chromatographic separations can be accomplished with essentially the same piece of equipment, the chemical processes are entirely different. Since the early 1900s, ion exchange resins have been used in separation applications ranging from soluble material recovery to the purification of process or wastewater streams. www.solventseparation.com /chemviron/tech/technologies/ion_exchange   (311 words)

Chabazite - GSA Resources, Inc. Ion exchange resins are not used to treat radioactive effluents because the radiation destroys the resin. It is the microcrystallinity of the chabazite that produced large surface area and pore volume which promotes accelerated ion exchange and sorption rates as well as high permeability. The herschelite is preferred for most ion exchange application because the sodium cation exchanges more readily than calcium, potassium or magnesium cations. www.gsaresources.com /chabazit.htm   (680 words)

Ion Exchange The 13 chapters cover all aspects of ion exchange including both the theoretical fundamentals and the practical applications of this phenomenon in manufacturing, mineral refining, and environmental clean-up. It discusses the main achievements of scientists of the former USSR in the areas of ion exchange science and technology. www.booknews.co.uk /Books/Book1087.html   (60 words)

ION EXCHANGE RESEARCH In the Laboratory of Radiochemistry we studied the use of chelating ion exchanger resins, activated carbons and inorganic ion exchangers for the removal Cd, Co, Ni, Cr, Zn and Cu from the waste effluents from metal plating plants. Special focus was paid to Zn and Ni ion exchange equilibria and to hydrolysis of the exchangers. In the 1990’s I studied the basic ion exchange properties of chelating ion exchange resins, especially iminodiacetate and aminophosphonate resins. www.mv.helsinki.fi /home/jklehto/ionex.htm   (585 words)

Liquid Separations: Product Information - Ultrapure Chemicals and Gases for the Electronics Industry Ion exchange resins are typically supplied water wet and must be dried for good contact with gases. Many ion exchange separations are known and widely practiced in the chemical processing industry. When a specific contaminant cannot be identified, a mixed bed ion exchange resin is best because it is capable of removing both cations and anions. www.dow.com /liquidseps/prod/sp_upw.htm   (865 words)

ION EXCHANGE Ion exchange is a technology that, although not new, is in a stage of on-going discovery, use, and future potential. Developing new ion exchange technologies is also impossible without a good grasp of ion exchange principles and theories (unless you stumble across something by sheer luck, in which case I suggest quickly going to Las Vegas). More information on ion exchange is available in an engineering library near you, so if you are interested even further, it is suggested to use this resource as well. www.rpi.edu /dept/chem-eng/Biotech-Environ/DUDAS/systems.html   (297 words)

Ion Exchange and Chromatography Ion exchange chromatography (IEC) is applicable to the separation of almost any type of charged molecule, from large proteins to small nucleotides and amino acids. The ion exchange mechanism may be expressed as in the figure 2. Ion exchange containing diethyl aminoethyl (DEAE) or carboxymethyl (CM) groups are most frequently used in biochemistry. www.ionexchangeseparation.com /about/ion-exchange-chromatography.html   (867 words)

Ion exchange An ion exchange resin is a matter capable of attracting and binding dissolved ions in water and fluids. HOH ion exchange plants are used for treatment of water in steam and hot water plants, district heating plants, cooling plants, humidifiers and for processes within the chemical industry etc. which require - or can use with advantage - a chemically pure water. In small ion exchanger plants (the bottle type) the water will be led in at the top of the tank and after a trip through the resin, the water will be pressed up through a pipe placed in the middle of the tank. www.hoh.com /02_processer/ionbytning.htm   (458 words)

Ion-Exchange In the context of water purification, ion-exchange is a rapid and reversible process in which impurity ions present in the water are replaced by ions released by an ion-exchange resin. Except for certain improvements in the type of ion exchange material and the equipment, Gans’ process is still one of the simplest methods for softening water. The calcium and magnesium ions are exchanged for an equivalent number of sodium ions. www.excelwater.com /eng/b2c/ix.php?WL_Session=fe264b126e1ad62b26b06bcec18cf240   (1032 words)

eBay - ion exchange, Nonfiction Books, Healthcare, Lab Life Science items on eBay.com Ion Exchange and Solvent Extraction - Sengupta, A *NEW Ion Exchange and Solvent Extraction by Arup K. Sengu... Ion Exchange and Adsorption Agents in Medicine the Conc search-desc.ebay.com /search/search.dll?query=ion+exchange&newu=1&krd=1   (388 words)

Background on Ion Exchange Chromatography Ion exchange chromatography depends on the ionic character of a protein/enzyme and since this property of an enzyme will change with the pH, it also depends on the pH of buffer used to dissolve the enzyme. There are two basic types of ion exchangers: those for binding positively charged ions or cations, which display on their surface negatively charged groups; and those for binding negatively charged ions or anions, which display on their surface positively charged groups. The ion exchanger is composed of the solid support material, which for enzymes and proteins must be a "hydrogel" or polymer composed for easily hydrated groups like cellulose consisting of polymers of sugar molecules. www.bio.mtu.edu /campbell/bl4820/lectures/lec6/482w61.htm   (315 words)

Ion Exchange The ion exchange system is composed of a sediment filter, followed by a mixed bed ion exchange filter (95% cation to 5% anion resin), an aeration unit, granular activated carbon (GAC), and ultraviolet light for disinfection. The ion exchange (IE) system is actually a combination of processes that treats all the water going into the home. Because the different processes in the ion exchange system remove different radionuclides, the Department tested for each radionuclide at each step in the process. www.scdhec.net /water/html/urie.html   (350 words)

JCE 1996 (73) 639 [Jul] Visible Ion Exchange Demonstration for Large or Small Lecture Halls On a Dowex 50w-X8 ion exchange resin (H+ form of the copolymer sulfonated styrene and p-divinyl benzene), the column is washed with distilled water until the water tests negative for ions with a conductivity apparatus and the pH is the same as the distilled water used for the washing. The eluant may be green in the presence of high chloride ion concentration forming the yellow tetrachlorocuprate (-2) ion in favor of the blue hexaaquocopper (II) ion. The column is recharged with hydrochloric acid, thus illustrating that the copper ion is being leached off the column and collected in the eluant. jchemed.chem.wisc.edu /Journal/issues/1996/jul/abs639_1.html   (343 words)

Ion Exchange Resins The type of exchange performed (cation or anion) is determined by the functional group added to the resin. Spectra/Gel cation exchange resins are strong (type 50) ion exchange resins. Spectra/Gel Ion Exchange Resins are ideally suited to protein purification, antibody isolation, and peptide fractionation. www.lplc.com /others/ionexch.html   (602 words)

Ion-exchange chromatography At low ionic strength, competition between the buffer ions and proteins for charged groups on the ion exchanger is minimal and so the proteins bind strongly. Negatively charged exchangers bind positively charged ions (cations) They can bind one type of cation but, when presented with a second type of cation, this may displace, or exchange with, the first. The term 'weak' does not refer to the strength of binding of ions to the resin nor to the physical strength of the resin itself. instruct1.cit.cornell.edu /courses/biobm330/protlab/Ion_Exchange.html   (1433 words)

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