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Showing 1 to 20 of 40 for “"ion-exchange resin"”.
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A study of the decay of acid cationic ion exchange resin
A study was undertaken on the decay of acid ion exchange resin from both a qualitative and quantitative perspective. The qualitative study concentrated on observing the impact on resin strength of varying electrolyte concentrations and varying di-vinyl benzene contents, during the loading phase. …
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Measuring Bioavailable Copper in Estuarine Waters using an Ion Exchange Resin
Anion exchange methods were used to measure the percent of weakly bound and strongly bound copper in estuarine waters and agricultural drainage. Copper bound to an ion exchange resin has been operationally defined as bioavailable copper, or copper that is available for uptake by aquatic organisms. …
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The effect of cross-linkage on internal diffusion in Dowex-50 ion exchange resin
… agricultural chemists, that the idea of actual exchange of ions was proposed. Ion exchange has been investigated extensively, resulting in applications to softening of water, purification of sugar, separation of compounds, recovery of metals, many pharmaceutical separations and many …
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The catalytic conversion of low chain length hydrocarbons to liquid fuels using ion exchange resin
The use of ion exchange resins in the polymerization of a c 4 -mixture to liquid fuels has shown that the catalyst is highly active, deactivates at a slow rate and selectively produces mainly dimers. Macropore diffusion resistance strongly influences the overall rate of the reaction. An increase in …
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Improving the selectivity of the radio-labelling of ion exchange resin tracers for positron emission particle tracking
Positron emission particle tracking (PEPT) is a technique which non-invasively tracks tracer particles labelled with a positron emitting radionuclide in a system of flow. The tracers are tracked through the detection in a PET scanner, of the two nearly collinear 511 keV gamma rays resulting from …
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Understanding the nonaqueous partitioning of per- and poly-fluoroalkyl substances (PFAS)
… fate, including their environmental distribution, bioaccumulation in biota, and treatment process, is of particular interest. Soil acts as a reservoir of PFAS in the environment, serving as a secondary contaminant source for the vadose zone, surface water, groundwater, and biota. PFAS leaching …
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The cross-flow chromatographic separation of carbohydrate mixtures
… and 12mm wide. The annular space is filled with ion-exchange resin. The upper and lower surfaces of the annulus are enclosed by stainless steel flanges. The entire bed is rotated slowly at speeds of up to four revolutions per hour. Feed solutions are introduced via a Stationary inlet distributor …
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The Separation of Carbohydrates by Continuous Production Scale Chromatography
… columns. The mechanism of the chemiadsorption chromatography employed in this research has been described in detail. Various industrial chromatographic processes used for the refining of sugars have been outlined. The design and construction of a liquid-solid semi-continuous chromatographic …
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The thermodynamics, mechanism and kinetics of the catalytic conversion of propylene and water to diisopropyl ether over amberlyst 15
… a feed of propylene and water over Amberlyst 15 ion exchange resin catalyst. It was produced in a trickle bed reactor at pressures between 1 bar and 60 bar, at temperatures between 70°C and 160°C and at overall propylene to water ratios between 1:5 and 10:1. Reaction proceeded in the liquid phase …
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Vegetative Potential to Reduce Total Dissolved Solid Nutrient Ions Generated from Reclaimed Mine Lands in Central Appalachia
… major issues in surface coal mine land reclamation is the impact of total dissolved solids (TDS) on water quality. To address this issue, this study assessed whether vegetation could reduce TDS nutrient ion movement from the rooting zone in early reclamation stages when TDS generation is often …
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The use of advanced treatment methods for removal of color and dissolved solids from pulp and paper wastewater
… investigated the use of activated carbon and ion exchange for the removal of color and dissolved solids from pulp and paper wastewater generated by the Union Camp Corporation mill in Franklin, Virginia. The objective of the treatment was to provide a high quality effluent suitable for direct …
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Synthesis of anion exchange/activated carbon fiber hybrid materials for aqueous adsorption of toxic hexavalent chromium
… been identified as a carcinogen by ingestion. Unfortunately, it is present in drinking water supplies in United States. An effective, Point-of-Use (POU) based technology to remove Cr(VI) in tap water is urgently needed to protect human beings against this carcinogen. Due to the inadequate …
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Kinetics of alkali metal ion self-exchange on polystyrene sulfonate resin in dimethyl sulfoxide-water media
<p>Rates of alkali metal cation self-diffusion in a polystyrene sulfonate ion exchange resin and in the external solution have been measured over a range of dimethyl sulfoxide (DMSO)-water mixtures from 0 to 70 mole % DMSO. Interpretation of results is simplified by the choice of this system which …
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An Immobolized Surfactant Extraction Technique Compatible with High Performance Liquid Chromatography-Ultraviolet Visible Detection
Surfactant mediated extractions are analogous to liquid-liquid extractions (LLE) except surfactants are used as extractants instead of organic solvents. The benefit for using surfactants for extractions includes lower toxicity, lower associated costs and direct compatibility with high performance …
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Continous annular chromatography for the separation of carbohydrate mixtures
The continuous separation of beet molasses resulting in a sucrose rich product and a non-sugar waste product was carried out using a rotating annular chromatograph. The annulus was 12 mm wide and 1.4 m long and was packed with a sodium charged 5.5% cross-linked polystyrene ion exchange resin. …
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An Investigation of the destruction of ion exchange resins
Ion exchange resins are used for many purposes in various areas of science and commerce. One example is the use of cation exchange resins in the nuclear industry for the clean up of radioactively contaminated water (for example the removal of 137Cs). However, during removal of radionuclides, the …
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The Effects of a Dietary Bacterial Protein on Mineral Balance in Rainbow Trout (S. gairdneri Rich.)
… were added to trout diets in various combinations and with Pruteen, casein or fishmeal as protein sources in order to test the effects of these dietary factors on mineral balance. Interactions between dietary factors were investigated and their effects were related to the growth of the fish, …
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A Semi-Continuous Chromatographic Process for the Separation of Carbohydrates
… of the chromatographic process. The chemi-adsorption separation mechanism employed in this research study for the separation of glucose and fructose is outlined. A review of various industrial processes for manufacturing high fructose syrups is also included so as to serve as a basis for …
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Arsenic Stability In Fresh and Aged Amorphous Ferric Hydroxide Sludges Generated from Brine Treatment Processes
Using Environmental Protection Agency occurrence and concentration data, it is estimated that about 6 million pounds of arsenic-bearing residuals (ABSR) will be generated annually in the United States when full compliance with the new standard for arsenic in drinking water (10 μg/L) is realized. …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… requirement for higher molecular weight condensation polymers. The salts were prepared by treating monopotassium D-glucarate with H<super>+</super> form ion exchange resin to give D-glucaric acid, which was then reacted with a diamine. The glucarate portion of the salt was activated for …
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