Macroreticular Anion Exchange Research Articles

Comparison of Anion Exchange Resins for Recovering Plutonium from Nitric Acid Waste

Microreticular and macroreticular anion exchange resins were compared for their capability of recovering plutonium from nitric acid waste streams. Plutonium breakthrough capacity and elution behavior of the resins were determined as a function of resin properties. Small-bead microreticular resins with a polystyrene matrix containing 4% divinylbenzene cross-linkage showed the best performance. Of the 20- to 50-mesh resins, the macroreticular resin, Amberlite IRA-938, gave the highest plutonium breakthrough capacity and eluted plutonium the fastest.

Evaluation of anion exchange resins for plutonium-uranium separations in nitric acid

Pellicular, macroreticular and microreticular (gel-type) anion exchange resins were compared for the separation of plutonium from nitric acid solutions of mixed plutonium-uranium. AS Pellionex SAX (pellicular resin) and Amberlite IRA-93 (weak base macroreticular anion exchange resin) were found to have better uranium washing and plutonium eluting characteristics than any of the resins tested. However, the capacity of the pellicular resin was much lower than the other resins.

Preparation of macroreticular anion exchange membrane and its behavior relating to organic fouling

Preparation of macroreticular anion exchange membrane and its behavior relating to organic fouling

Preparation of macroreticular anion exchange membrane and its behavior relating to organic fouling

AbstractBase membranes were prepared by coating a monomer mixture consisting of styrene–divinylbenzene–polybutadiene–t‐amyl alcohol onto a polypropyrene cloth and subsequently by polymerizing the monomers. The resultant base membranes were chloromethylated and then quaternized. Thus, macroreticular anion exchange membranes were prepared and their properties were investigated. Furthermore, the organic fouling of the membranes was studied by using Na dodecylbenzenesulfonate as a foulant. The resistibility of the membranes was dependent on the balance between the porosity of the membranes and the foulant quantity.

Macroreticular anion exchange membranes for electrodialysis in the presence of surface water foulants

In this work two new types of anion exchange membranes having pore sizes of macro dimensions are described. Static and dynamic fouling resistance to common large anions found in surface waters is evaluated. Improvements over conventional microporous anion membrane types are discussed with respect to electrodialysis.

Selective absorption of novobiocin by macroreticular anion exchange resins

Selective absorption of novobiocin by macroreticular anion exchange resins

Anion-exchange equilibria in alkaline media

The distribution ratios of a large number of species are reported for anion exchange from strongly alkaline solutions. The strongly basic macroreticular anion exchanger, Amberlyst A-29, was used. The elements in the oxidation states studied are classified by their ion-exchange behavior. The degree to which a species is absorbed by the resin depends on whether it exists in an anionic form and whether it is hydrated or forms hydrogen bonds with the water in the aqueous solution. While working with hydroxide solutions presents some practical problems, the sizeable differences in distribution coefficients for several groups of ions may be analytically useful.