1. BY: JUAN GONZALEZ MEEN 3344 DOWEX 21 K XLT Anion Exchange Resin

2. What Is It It is a Type I Strong Base Resin Contains quaternary methylamines producing functionalities which give it the ability to exchange anions. When in the OH ionic form, this class of resin acts like a very strong insoluble base in solution Water 55 – 65 % Styrene 35 – 45 % Divinylbenzene Copolymer Ethylstyrene Copolymer Chloromethyl Trimethylamine functionalized in the chloride form

3. Physical & Chemical Properties Physical State: Solid Beads Color: White to Yellow Odor: Amine Specific Gravity: 1.06 – 1.10 Solubility in Water: insoluble in water pH: essentially neutral Particle Size: 0.3 – 1.2 mm

4. What Its Used For This specific type of resin is used in uranium recovery. Other types of resins are used for other types of metals depending on the nature of reaction. Uranium comes from the well field, enters anion exchange columns where it is mixed with the resin and is cleaned from the mud and sulfuric acids. Resin regeneration is completed through elution.

5. References DOWEX Ion Exchange Resins, A Powerful Chemical Processing Tool. Dow Liquid Seperations. The DOW Chemical Company. 2002 Material Safety Data Sheet. DOWEX 21K XLT Anion Exchange Resin. The DOW Chemical Company. 2007