Question

distillation of salt and urea​

Answer 1

Urea is soluble in alcohol and methanol while the salt isn’t, so you simply boil the urine to reduce its volume, add methanol, separate the methanol layer, add NaOHNaOHand a bit of H2SO4HX2SOX4 or HClHCl and evaporate the solvent. There should be urea pure enough for anything you want to do
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