By: Juan Gonzalez

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DOWEX 21K XLT Anion Exchange Resin

• By Juan Gonzalez
• MEEN 3344

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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

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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

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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.

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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