Diammonium phosphate (DAP) react with Sodium hydroxide

Question

The goal is to make anhydrous ammonia

Answer 1

While I'm not certain the following reaction can be carried out to produce "anhydrous" ammonia, it may be possible.  Anhydrous ammonia is usually produced by other methods, nonetheless, how about ...

 

(NH₄)₂HPO₄ + 2NaOH ==> Na₂HPO₄ + 2NH₃ + 2H₂O