Cations exchange resins for

Pharmacia s Q- and S-Sepharose anion- and cation-exchange resins For the anion-exchange process it was found that two step changes, simultaneous in pH and salt concentration were necessary to carry out the anion-exchange separation. A 0.01 M sodium acetate buffer, pH 5.8, was used forthe starting state orfeed loading buffer. After the whey feed was loaded onto the column, one column volume of this... 

Catalytic reduction, with Adams platinum oxide catalyst, 470 with copper-chromium oxide, 873 with Raney nickel, 566 Cation exchange resin, for esterification, 381, 387, 388 Cellosolve, 170, 265, 444 butyl, 170, 444 methyl, 170, 444 Cellulose, 458 ... 

The separation of rare earths by anion exchange resins depends on somewhat different factors for a given chelating agent than to the cation exchange resins. For EDTA in an anion exchange process the order of elution is not the inverse order of the stability constants as in cation exchange process, rather [79] 4... 

The acrylic weak base resins are synthesized from copolymers similar to those used for the manufacture of weak acid cation-exchange resins. For example, under appropriate temperature and pressure conditions, a weak acid resin reacts with a polyfunctional amine, such as dimethylaminopropylamine [109-55-7] (7) to give a weak base resin with a tertiary amine functionality. 

The sulfonated polystyrene beads can be used as a cation exchange resin. For example, if the sulfonated resin is treated with sodium hydroxide, the sodium salt of each of the sulfonic acid groups is formed. This resin can then be employed to exchange sodium cations for other cations in an aqueous solution. 

The use of low capacity surface sulfonated cation exchange resin for the liquid chromatographic separation of aromatic amines provides a rapid analytical technique for industrial hygiene surveys. A wide variety of amines can be analyzed by the same technique with good sensitivity. 

Resins with good hydrodynamic properties and sorption capadties for proteins and enzymes have been prepared by the polymerization of acrylic acid or methacrylic acid and a crosslinking monomer such as 1,3,5-triacryloylhexahydrotriazine (TAT) in aqueous acetic acid using a radical initiator. Methacrylic add-TAT copolymer prqjared by using a redox catalyst is useful as a cation-exchange resin for selective and reversible sorption of proteolytic enzymes such as terrilytin. 

Use of Eq. (18) permits identification of the log(y +/Yp,+ ) term as the one contributing most importantly to differences in affinity of pairs of univalent metal ions, M and N, for a cation-exchange resin. For example, for the equilibrium distribution of Li and Na ions between dilute solutions of Li and Na" " chloride (myQ + m jci = 0.010 m) and the much more highly concentrated Dowex-50 (8% cross-linked by weight with divinylbenzene) phase (niy, + iUnj, = 4.5 m) the p(Vy+ - Vjjj,+ )/2.3 RT and the 2 log(yyQ/y j(-i) term yield a small sum (< 0.04) while the value of log (Yu /Ynj,+ ) approaches 0.35 once correction for interaction between the two metal ions is made. Correlation between experiment and computation of the Gibbs-Donnan-based terms is strongly supportive of the model. 

Backes C. A. and Tipping E. (1987) An evaluation of the use of cation-exchange resin for the determination of organically-complexed A1 in natural acid waters. Int. J. Environ. Analyt. Chem. 30, 135-143. 

Selectivity of Sulfonated Cation-Exchange Resin for Metal Cations... 

Selectivity of Sulfonated Cation-Exchange Resin for Metal Cations Table 5.5. Retention factors (k) of various cations when sodium perchlorate eluents are used. 

Although several factors may influence the selectivity of cation-exchange resins for... 

In order to obtain the detailed feature of optical resolution of /<2C-[Co(AA)3] where AA represents a- or B-amino acid, a series of diastereomeric or enantiomeric mixtures of /ae-[Co(a-AA)3 n(B-AA)n] were prepared and each mixture was eluted by passing an aqueous solution of Napd-tart through the column packed with TSK cation-exchange resin. For /,ac-[Co(gly)3 n(B-ala)n], the retention volumes of the enantiomers were obtained in each chromatographic run. Thus, the ratio of the retention volumes of enantiomers, that is, the separation factor for A and A pairs of [Co(gly)2(B-ala)], [Co(gly) ( B-ala)2] and [CoCB-ala ] were obtained easily. 

Uses Cation exchange resin for water treatment, metal recovery, iron removal, dealkalization, refining of cane sugar, prep, of antibiotics, medicines, amino acids, and purification of pharmaceuticals and foods Trade Names Rohagum M-527... 

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