In this video we react molten sodium bisulfate and potassium nitrate, in a reaction that i've done at least 14 times before over the years, what could possibly go wrong :)
  / explosionsandfire  

The distillation is essentially the same as using conc sulfuric acid and a nitrate salt to obtain RFNA, but molten sodium bisulfate is used, which requires the pot temperature of the distillation to be just over 300 degrees.