chelation

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chelation

[kē′lā·shən]
(organic chemistry)
A chemical process involving formation of a heterocyclic ring compound which contains at least one metal cation or hydrogen ion in the ring.
References in periodicals archive ?
Also, it has been proven that A[beta]'s metal-binding ability is better for copper (Cu) than for iron (Fe) and its affinity quite equals that shown by the best known chelants, like the ethylenediaminetetraacetic acid (EDTA).
"These factors resulted in the business needing to review its long-term strategic options for the chelant and sodium sarcosinate production at Seal Sands." Dow closed its Wilton ethylene oxide and glycol (EOEG) production facility in 2009 with the loss of 55 jobs, triggering problems for the integrated supply chain on the Wilton complex.
The mining soil was determined to have a much larger percentage of soluble uranium in the soil; therefore, the chelant was able to remove a larger percentage of uranium.
A Dow spokesperson said: "The option to idle the facility comes on the back of increasingly challenging operational and market conditions; lack of cost effective and reliable raw material supply, alongside overcapacity in the liquid chelant sector.
Depending on the metal content in the pulp, either it is chelated separately or stabilized with the addition of magnesium sulfate (epsom salt), or chelant added in the peroxide stage.
The composition is comprised of a chelant selected from the group consisting of glutamic acid, diethylenetriamine penta methylphosphonic acid; diethylenetriamine pentaacetic acid, methyl glycinediacetic acid and mixtures thereof; a surfactant selected from the group consisting of anionic, nonionic, cationic, amphoteric, zwitterionic, semi-polar nonionic surfactants and mixtures thereof; a branched nonionic surfactant; and aqueous liquid carrier.
It is comprised of a surfactant system (including an alkox-ylated nonionic surfactant, a sulphated or sulphonated anionic surfactant; and a neutralizing co-surfactant); a thickener or mixture thereof; a chelant or mixture thereof; a solvent selected from the group consisting of ethers having from 4 to 14 carbon atoms, diethers having from 4 to 14 carbon atoms, glycols, alkoxylated glycols, alkoxylated aromatic alcohols, aromatic alcohols, alkoxylated aliphatic alcohols, aliphatic alcohols, C8-C14 alkyl hydrocarbons, C8-C14 cycloalkyl hydrocarbons, C8-C14 alkyl ha lohydrocarbons, C8-C14 cycloalkyl halohydrocarbons, C6-C16 glycol ethers, and mixtures thereof; and water.
Innospec technologies include: sulfate free, mild surfactants, emollient esters, silicones, natural and synthetic polymers, environmentally friendly chelants and specialty additives.
Prior to Chemtura, Davidson held a variety of leadership roles with The Dow Chemical Company including global business director, Amines and Chelants; and global asset director, Specialty Alkoxylation assets, Polyglycols, Surfactants and Fluids.