Strong base anion-exchange resins

Strong"Base. Strong base anion-exchange resins have quaternary ammonium groups, - NR OH , where R is usually CH, as the functional exchange sites (see Quaternary ammonium compounds). These resins are used most frequentiy in the hydroxide form for acidity reduction. 

In IC this problem of electrolyte background is overcome by means of eluant suppression. Thus in the above example of sodium and potassium analysis, if the effluent from the separating column is passed through a strong base anion exchange resin in the hydroxide form (suppressor column) the following two processes occur ... 

Strong acid cation exchangers, 74 411 Strong base anion-exchange resins, 74 382-383... 

A. (1994) Hofman degradation of strong base anion exchange resin. Proceedings of the 68th Autumn Annual Meeting of the Chemical Society of Japan, Nagoya October 1994,... 

An adsorption study on a strong base anion exchange resin from dilute HNO3 and aliphatic alcohols showed [51] that, with the exception of Eu (in CH3OH), the rare earth adsorption from HN03-alcohol solutions decreased with increasing length of the primary carbon chain in the alcohol concerned. 

Ion-exchange Separations. Because amino acids are amphoteric, they behave as adds or bases, depending upon the pH of die solution. This makes it possible to adsorb amino acids dissolved in water on either a strong-acid cation exchange resin or a strong-base anion exchange resin. The affinity varies with the amino acid and the solution pH. Ion-exchange resins are widely used in amino acid separations. 

Figure 12 Volume-distribution coefficients in hydrochloric acid for various elements on the strong-base anion-exchange resin Dowex 1 X-10 (after Krause and Moore, ref. 359)...

Separator column strong base anion exchange resin suppressor column strong acid resin in hydrogen form eluting solvent 0.005 M sodium borate. 

Strong base anion exchange resins are manufactured by chloromethylation of sulphonated polystyrene followed by reaction with a tertiary amine ... 

The LiCl AIX process is based on (i) the formation of anionic chloride complexes of the tripositive actinide and lanthanide metals in concentrated LiCl solutions, (ii) the sorption of these complexes onto a strong base anion exchange resin contained in a column, and (iii) the preferential chromatographic elution of the lanthanides as a group prior to elution of the actinides. The generalized formation of the trivalent metal anionic chloride complexes is illustrated in equation (1) ... 

Heller, T., et al. (1997). Properties and performance of Type 111 strong base anion exchange resin Purolite A555. Proc. 1997 Int. Conf. on Power Generation, POWER-GEN, Dec. 9-11, Dallas, TX, 158. PennWell Publ. and Exhib., Houston. TX. 

All common strong base anion exchange resins are quaternary ammonium derivatives but Types 1 and 2 differ in their basicity. Type 2 resins are slightly less basic than their Type 1 equivalents which results in the former materials exhibiting a slightly higher affinity for hydroxide ions. 

Irreversible swelling is a phenomenon principally observed with acrylic strong base anion exchange resins whereby upon undergoing their first few aqueous ion exchange cycles an irreversible expansion occurs of around 7—10% over and above the reversible volume changes which thereafter apply. 

A typical impurity of epttimercial concentrated liydroGhloric add is iron. This is present as an anionic complex FeGL—i This is removed on a strong base anion exchange resin in the chloride form Ad the complex only exists in... 

The first regeneration of the strong base anion exchange resin with a near stoichiometric quantity of sodium hydroxide converts the loaded dichromate form of the resin to the chromate form whereafter it is able to efficiently take up chromic acid again. The anion column effiuent of sodium chromate may be cation exchanged across a strong acid resin in the hydrogen form to recover chromic acid ... 

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