Ion Exchange Resins

Chromatographic Separations

“…Many of these ion exchangers, although formed in large particles or beads in order to facilitate rapid filtration, appear to be porous to the reactive ions and do not disintegrate upon repeated reaction and regeneration (17,58). Particular properties of many of these products have been reviewed by Myers (92) and by Applezweig (7). Surface-active substances such as charcoal or alumina may be converted into ion-exchange adsorbents by preliminary adsorption of acids or bases (70, 138) just as cloth is rendered more attractive to dyes by treatment with mordants.…”

“…The amount of solvent which flows through an adsorption column before a solute appears in the percolate serves as a measure of the adsorption capacity of the column and is related to the R value. It is variously known as the "threshold volume" (28, 73, 74,92), the "retention volume" (28, 29,128,129), and the "break-through volume" (83,92), the last term being widely accepted in engineering practice (83).…”

“…(28, 75,74,92), the "retention volume" (28, 29,128,129), and the "break-through, ~~ volume" (S?, 9?LL:he last term being widely pounds of molecular weights from one to 2 . million can be Studled with adsorption columns provided these substances are soluble or dispersible in the.liquids that are suitable for formation of the chromatograms.…”

Sodium and Bromide Removal from Solvents by Nonaqueous Ion Exchange

“…Myers (5) found that a small amount of water will permit acid binding to occur when using wet solvents and Amberlite IR-4. As in the first case, these were static equilibrium experiments.…”

Conduct of Amino Acids in Synthetic Ion Exchangers

“…He finally eluted the basic amino acids from the cation exchanger w'ith hydrochloric acid and separated them by a modified Kossel procedure. Myers (7) called attention to many interesting applications of ion exchangers, among which are mentioned their use in the isolation, purification, and recovery of physiologically active materials. In this connection it has been found (3), in comparing the rate and extent of fermentation of the refined sirup from Jerusalem artichokes with that of the raw extract, that some materials essential to yeast development are removed by the exchangers and decolorizing charcoal.…”