I know calcium ammonium nitrate (CAN) is used for cold packs. By bending a small metal plate the salt gets dissolved in water (separated pack) and this process is endothermic.

I would like to heat this calcium ammonium nitrate solution to get back anhydrous CAN. Is there a way I can do it without safety issues?

  • Source 1 advices to heat it up to 210 °C.
  • Source 2 mentions the possibility to decompose at 60 °C into nitrogen oxides

Do you think I can heat the mixture up to 100 °C?

  • $\begingroup$ chemistry.stackexchange.com/questions/78776/… $\endgroup$
    – Mithoron
    Aug 1, 2018 at 21:08
  • $\begingroup$ Can I heat this icepack made of calcium ammonium nitrate up to get a reversible process? Are there alternatives with higher reaction enthalpy? $\endgroup$
    – laminin
    Aug 1, 2018 at 21:38
  • 3
    $\begingroup$ This is an extremely difficult problem. The answer is worth a lot of money to people who would like to use this for something other than personal comfort cold pack. $\endgroup$
    – ericksonla
    Aug 2, 2018 at 19:34
  • 2
    $\begingroup$ What we think is irrelevant. Try heating a very small amount to $100\pu{^\circ C}$ and see what happens. $\endgroup$
    – A.K.
    Aug 4, 2018 at 18:54


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