Junurita - 7-8-2025 at 01:37
Hi everyone,i have saw a lot of source about make guanidine from urea,these source said mix urea with ammonium nitrate with silicagel catalyst and
heating in 200c will form guanidinium nitrate,but i dont want to waste nitrate.Can i use ammonium sulfate instead ò nh4no3 to make guanidinium
sulfate?
Im vietnamese and my english is not good,please forgive me if I make any spelling mistakes.Thank you very much.
Boffis - 8-8-2025 at 13:08
Hi Junurita, welcome to the madhouse! I can't answer your question definitively but I can say that the nitrate ion is only a spectator ion and is not
directly involved in the reaction, so it is likely that any ammonium salt will do. The only caveat is that it may be necessary that the ammonium salt
melt easily and the melt mixes easily with molten urea. If this is the case its worth trying more fusible salts (ammonium acetate ~135 C, ammonium
nitrate ~165, ammonium sulphate ~250, ammonium chloride ~335 C).
Junurita - 8-8-2025 at 19:12
Okay,i will try it.Thanks you very much!
Varungh - 15-8-2025 at 23:23
If you do not have ammonium nitrate, it can be made by reacting ammonium hydroxide with nitric acid
Nitric acid can be made by mixing NaHSO4 with Ca(NO3)2
Ammonia soln can be made or bought as ammonia cleaner
Niklas - 16-8-2025 at 01:45
Reacting ammonium sulfate with calcium nitrate (both available as fertilizer), filtering off the insoluble calcium sulfate, and evaporating the
solution to get ammonium nitrate would save a step. Would also be simple mixing and filtering and wouldn’t require distillation like nitric acid.