Separation of KCl from potassium chromium(III) PDTA

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    Kcl Separation
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SUMMARY

The discussion focuses on the challenges of separating KCl from the potassium chromium(III) PDTA coordination complex, where KCl is a significant byproduct. Both KCl and the complex are soluble in similar solvents, complicating the separation process. The organic ligand PDTA shows limited solubility in polar organic solvents, and attempts to protonate the complex risk degradation. Literature indicates that displacement methods, such as using methyltetraammonium chloride or AgNO3, are ineffective due to solubility issues.

PREREQUISITES
  • Understanding of coordination chemistry and complex formation
  • Knowledge of solubility principles in organic solvents
  • Familiarity with cation displacement reactions
  • Experience with crystallization techniques
NEXT STEPS
  • Research methods for separating coordination complexes from soluble salts
  • Investigate alternative organic ligands for potassium chromium complexes
  • Explore crystallization techniques to selectively isolate KCl or the complex
  • Study the properties and solubility of methyltetraammonium chloride in various solvents
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Chemists, particularly those specializing in coordination chemistry, inorganic synthesis, and separation techniques, will benefit from this discussion.

Mayhem
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The mentioned coordination complex has been prepared where KCl is a significant byproduct. The salt and the complex appear to be readily soluble in the same solvents. Despite the organic ligand (PDTA), it is not soluble in polar organic solvents, at least to a degree where it can be used for separation. Protation is most likely not possible without degrading the complex.

I can't find any literature that puports a simple separation method. I thought that perhaps the complex could have its cation displaced by an organic cation (an methyltetraammonium chloride, for example), which is also water soluble. Not sure if this would work.

Literature shows that the silver salt of potassium chromium PDTA is also insoluble[1], so a simple AgNO3 displacement also wouldn't work.

Any ideas?
 
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