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Topic: Ion exchange

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	Ion Exchange (IE)
		Ion Exchange (IE) and adsorption processes mastered by Novasep Process (via Applexion) are based on competitive interactions of species contained in a (moving) liquid phase with specific chemical sites of a solid phase (also referred to as the resin or the adsorbent).
		Ion exchange resins consist in a polymeric matrix and a functional group with a mobile ion which can be exchanged with other ions present in the solution to be treated.
		Ion exchange resins are mostly available in a moist beads form (granular or powdered forms are also sometime used, dry form is also available for applications in a solvent media) with a particle size distribution typically ranging 0.3 – 1.2 mm (16 – 50 mesh) with a gel or macroporous structure.
	www.novasep.com /technologies/ion-exchange.asp (1002 words)

	ion exchange : ion exchange resins (APPLEXION, XA)
		ion exchange : ion exchange resins (APPLEXION, XA)
		Under XA designation a comprehensive list of ion exchange resins are available for numerous applications and designs.
		Before loading a column with ion exchange resins it is important to observe a precise procedure for the filling of the columns, the backwashing of the resins and the conditioning prior to use.
	www.novasep.com /Technologies/ion-products.asp (195 words)

	Ion exchange Summary
		Ion exchange is a process in which ions are exchanged between a solution and an ion exchanger, an insoluble solid or gel.
		Ion exchange is a method widely used in household and industrial water purifications to produce soft water.
		Ion exchange chromatography is a chromatographical method that is widely used in biochemistry to separate charged molecules such as proteins.
	www.bookrags.com /Ion_exchange (1478 words)

	NationMaster - Encyclopedia: Ion exchange resin (Site not responding. Last check: )
		An ion exchange resin is an insoluble matrix (or support structure) normally in the form of small (1-2 mm 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 are used in the manufacturing of pharmaceuticals, not only for catalyzing certain reactions but also for isolating and purifying pharmaceutical active ingredients.
		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.
	www.nationmaster.com /encyclopedia/Ion-exchange-resin (2104 words)

	Ion Exchange Resin
		1) " Ion" -- As to Ion Exchange Resin
		2) " Exchange" -- As to Ion Exchange Resin
		3) " Resin" -- As to Ion Exchange Resin
	www.altvetmed.com /face/17275-ion-exchange-resin.html (730 words)

	Ion exchange - Definition, explanation
		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.
		Ion exchange is a method widely used in household and industrial water purifications to produce soft water.
		Ion exchange chromatography is a chromatographical method that is widely used in biochemistry to separate charged molecules such as proteins.
	www.calsky.com /lexikon/en/txt/i/io/ion_exchange.php (503 words)

	ION EXCHANGE
		The theory of ion exchange as a separation technique is tested in the laboratory by using any available cation exchange resin and Pasteur pipets.
		An ion exchanger is a special type of giant molecule which has a very porous, negatively charged lattice filled with water molecules and enough positive ions to maintain neutrality.
		Classically, zeolites were charged with sodium ions because sodium is a suitable cation for exchanging with the calcium and magnesium ions in hard water.
	www.woodrow.org /teachers/chemistry/institutes/1986/exp34.html (942 words)

	Ion Exchange (Site not responding. Last check: )
		The process in which beds of filter or ion exchange media are subjected to flow opposite to the service flow direction to loosen the bed and to flush suspended matter, collected during the service run, to waste.
		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.
	xnet.rrc.mb.ca /rcharney/Ion_Exchange.htm (2551 words)

	10 CFR Appendix E to Part 110--Illustrative List of Chemical Exchange or Ion Exchange Enrichment Plant Equipment and ...
		Especially designed or prepared for uranium enrichment using the ion exchange process, including porous macroreticular resins, and/or pellicular structures in which the active chemical exchange groups are limited to a coating on the surface of an inactive porous support structure, and other composite structures in any suitable form including particles or fibers.
		The ion exchange enrichment process may use, for example, trivalent titanium (Ti+3) as a reducing cation in which case the reduction system would regenerate Ti+3 by reducing Ti+4.
		The ion exchange enrichment process may use, for example, trivalent iron (Fe+3) as an oxidant in which case the oxidation system would regenerate Fe+3 by oxidizing Fe+2.
	www.nrc.gov /reading-rm/doc-collections/cfr/part110/part110-appe.html (1353 words)

	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.
		In general, the larger the ion or molecule diffusing into an ion exchange particle, or the more highly crosslinked the polymer, the longer will be the time required to reach equilibrium conditions.
		The second is called internal diffusion and is the movement of ions from the surface to the interior of an ion exchange particle.
	www.rpi.edu /dept/chem-eng/Biotech-Environ/IONEX/resins.htm (1101 words)

	Ion Exchange
		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.
		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.
	www.pwbrc.org /bmr/ix.htm (1500 words)

	Ion Exchange Chromatography by Angela Crane
		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.
		Ion exchange chromatography requires a matrix that allows for the exchange of counter-ions for other ions without altering the matrix.
	www.samford.edu /~gekeller/crane.html (471 words)

	Ion Exchange
		ION Exchange technology has been in limited use for years, primarily for the generation of de-ionized water.
		Ion exchange resin beads (thousands per cubic inch) are placed in a pressure vessel to makeup the ion exchange resin bed.
		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.
	www.lhwinc.com /ionexchange.htm (533 words)

	Principles of Ion Exchange
		Ion exchange is a process used extensively in nuclear facilities to control the purity and pH of water by removing undesirable ions and replacing them with acceptable ones.
		Exchange capacity is the amount of impurity that a given amount of resin is capable of removing, and it has units of moles/ml, equivalents/ml, or moles/gm.
		The term normally applied to ion exchanger effectiveness is decontamination factor (DF), which is defined as a ratio of the concentration (or activity) of the fluid at the inlet compared to the concentration (or activity) at the effluent, which expresses the effectiveness of an ion exchange process.
	www.tpub.com /doechem2/chem220.htm (1775 words)

	General frequently asked questions about ion exchange resins (Site not responding. Last check: )
		The total available capacity or total exchange capacity is a measure of all the functional groups on a resin and is reported on a unit volume of wet resin or a unit weight of dry resin.
		Water wet ion exchange resins shrink or swell when they change from one ionic form to another and they shrink when they are in contact with non-polar solvents.
		The pressure drop is directly proportional to the flow rate, the viscosity of the feed, and the depth of the resin bed, and is inversely proportional to the square of the diameter of the resin beads.
	www.rohmhaas.com /ionexchange/IP/faq_general.htm (1393 words)

	GE Healthcare Life Sciences - Ion exchange chromatography
		Ion exchange - A mode of chromatography in which ionic substances are separated on cationic or anionic sites of the packing.
		Separation in ion exchange chromatography is based upon the selective, reversible adsorption of charged molecules to an immobilized ion exchange group of the opposite charge.
		Ion exchange is probably the most frequently used chromatographic technique for the separation and purification of proteins and other biomolecules.
	www1.amershambiosciences.com /aptrix/upp00919.nsf/Content/ProteinPProcDevM_Tech%5CPP_IEX (205 words)

	Ion Exchange Recycle
		Ion exchange resins can be utilized to soften and/or deionize the water.
		A standard dual bed ion exchange unit consists of a strong acid cation resin that exchanges hydrogen for positively charged cations present.
		The cation ion exchange resin is regenerated with an acid to exchange the hydrogen back onto the cation resin beads.
	www.lttechnologies.com /ion_exchange_recycle.htm (509 words)

	4-48 Ion Exchange
		Ion exchange removes ions from the aqueous phase by exchange with counter ions on the exchange medium.
		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.
	www.frtr.gov /matrix2/section4/4-49.html (683 words)

	Ion Exchange Chromatography
		When the copper(II) ions bind to a cation exchange resin which has hydrogen ions bound to it, the copper ions displace the hydrogen ions which are eluted from the column and collected in the effluent.
		These chloride complex ions differ in both their stabilities and in their abilities to be absorbed on an anion exchange column.
		Wash your anion exchange column by adding about 5 mL of 9 M HCl to the top of the column and allowing it to drain through the column to the top of the resin bed.
	www.sonoma.edu /chemistry/chem115b/ion.html (1665 words)

	ChemLab - Chemistry 3/5 - Ion Exchange - Chemistry
		Attached to the carbon skeleton of the resin are the active groups that bind the exchangeable ions.
		Note that sodium ions displace hydrogen ions when a resin in the hydrogen form is exposed to a sodium chloride solution, while the reverse is true when a resin in the sodium form is exposed to hydrochloric acid.
		An efficient approach to the problem of exchanging all the ions in a salt solution for resin hydrogen ions is to pack the beads into a glass tube to prepare an ion exchange column.
	www.dartmouth.edu /~chemlab/chem3-5/ionx1/full_text/chemistry.html (1141 words)

	Background on Ion Exchange Chromatography (Site not responding. Last check: )
		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)

	Financial Express: Psychotherapist heals conflict scabs at Ion Exchange
		When environmental and water management major Ion Exchange's chairman GS Ranganathan felt that conflict between senior members of the management was influencing their direct teams and alsohaving a negative impact across the board, it was time to act.
		Ion Exchange knew that for success they needed to deploy people to the best effect and that the success of every team assignment hinges on the quality of teamwork behind it -- on team members who collaborate and synergise their personal strengths for optimal results.
		When Ion Exchange invited Thomann to use the conflict clearing module at a three-day session at Nashik, it was no easy sailing.
	www.expressindia.com /fe/daily/19980904/24755384p.html (1169 words)

	Ion Exchange Systems
		This process of ion exchange will continue until all available exchange sites are filled, at which point the resin is exhausted and must be regenerated by suitable chemicals.
		Thus, when the hard water containing the Calcium and Magnesium Ions is passed through the resin bed, the calcium and magnesium ions adhere to the resin, releasing the sodium ions until equilibrium is reached.
		Ion exchange deionizers (DI) use synthetic resins similar to those used in water softeners.
	www.filterswater.com /water-purification/ionexch.htm (759 words)

	Chromium and zinc removal and recovery by ion exchange - Patent 4376706
		Of the three, ion exchange is the only method where the zinc and chromium are recovered in a form directly reusable in the system from which they were removed.
		The lower concentration of the zinc ions at the stratified bed outlet is explained by the fact that the pH of the effluent increases during the passage through the upper layer of anionic resin.
		The ion exchange columns were gravity fed from the constant head tank and the flows through the columns were maintained by adjusting the outlet valves.
	www.freepatentsonline.com /4376706.html (7572 words)

	Ion Exchange Resins in Formulation : An Update (Site not responding. Last check: )
		Ion exchange resins may have inherent bioadhesive properties similar to those of highly charged polyanions. Hence ion exchange resins may be useful mucoadhesive systems for topical treatment of stomach such as in H.pylori infection for prolonging the gastric residence of amoxicillin and cimetidine
		Ion exchange resin could be considered as concentrated electrolytes with one immobile ionic species.
		Ion exchange resin can be custom manufactured to suit the formulation needs such as functionality, particle size, form of resin etc. Use of ion exchange resin is finding newer applications such as for handling deliquescent and hygroscopic substances, improving stability and as superdisintegrants.
	www.pharmainfo.net /exclusive/reviews/ion_exchange_resins_in_formulation_:_an_update (2236 words)

	Experimental and Modeling Study of Multicomponent Ion Exchange Equilibria on Zeolite Minerals
		Because of their favorable ion exchange selectivity for certain cations, such as Cs and Sr naturally occurring zeolites have been studied for their potential use in the treatment of wastewaters and the remediation of sites contaminated with radionuclides such as
		Although numerous theoretical and experimental studies of ion exchange equilibria have been published, most have focused on ion exchange reactions involving two cations only (binary exchange).
		Because a primary goal of the project is to develop a more uniform approach to modeling ion exchange reactions in zeolites, a solid solution activity coefficient model was developed using the Wilson equation.
	www.swri.org /3pubs/IRD2001/20-9211.htm (489 words)

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