Separation of KCl from potassium chromium(III) PDTA

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    Kcl Separation
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The discussion centers on the challenges of separating a coordination complex that produces KCl as a byproduct. Both the complex and KCl are soluble in similar solvents, complicating separation efforts. The organic ligand PDTA shows limited solubility in polar organic solvents, hindering its use for separation. Concerns are raised about the potential degradation of the complex if protation is attempted. The literature lacks straightforward separation methods, and attempts to displace the complex's cation with an organic cation, such as methyltetraammonium chloride, are uncertain. Additionally, the silver salt of potassium chromium PDTA is noted to be insoluble, rendering AgNO3 displacement ineffective. Alternative syntheses that do not produce KCl as a byproduct are referenced, suggesting that crystallization may favor one substance over the other despite their solubility in the same solvents.
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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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