By Dimitri Muraviev, Vladimir Gorshkov, Abraham Warshawsky
ISBN-10: 0824703251
ISBN-13: 9780824703257
This article goals to supply the easiest of ion alternate technology carried out within the international locations of the previous Soviet Union. It studies the multidisciplinary research on the nexus of actual, natural, inorganic and organic chemistries, and progresses from theoretical basics to useful purposes in production, mineral refining and environmental clean-up. The textual content examines advances and phenomena saw in ion-exchange structures.
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Additional info for Ion Exchange: Highlights Of Russian Science
Sample text
This procedure allowed a decrease of 2-3 orders of magnitude of impurities in the products, compared to a similar process carried out without IX purification. Highly pure tungsten and molybdenum are produced as the monocrystals following ultra purification of (NH 4) 2WO 4 and (NH 4) 2MoO 4 from metal impurities on an ANKB-35 chelating ion exchanger. The same solutions were purified from Si, P and As admixtures on hydrated zirconium oxide incorporated into KU-23 macroporous sulfonate cation exchanger [67].
Purification and Isothermal Supersaturation of Amino Acid Solutions Frontal separation can be used effectively for manufacturing highly pure amino acids by applying either (1) cation or (2) anion exchangers in the H- or OH-form, respectively. , used as a monosodium salt. , as a hydrochloride). e. g. R-N(CH3) OH + Cl' * R-N(CH3) Cl + OH~ AA* + OH - AA* (10) (11) where AA + is the cation of the amino acid. In both cases, the concentration of the purified amino acid becomes equal to twice the concentration of the initial salt (usually far more soluble 30 GORSHKOV, MURAVIEV, AND WARSHAWSKY than the amino acid) and, under certain experimental conditions, exceeds its solubility.
Component, proceeds at the bottom of column 2. Flow reversal is carried out by using preselected auxiliary ions, which are sorbed either weaker (the initial resin counter-ion) or stronger than the substance being purified (displacer). While the continuous frontal separation is carried out in column 1, the continuous reverse frontal separation proceeds in column 2. The combination of these two columns allows for optimizing the conditions in each column for certain parts of the zone of ions to be separated in this convenient version of displacement chromatography separation process (see above).
Ion Exchange: Highlights Of Russian Science by Dimitri Muraviev, Vladimir Gorshkov, Abraham Warshawsky
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