[EvilNeil]

I am very confused as to how ammonium sulfate reacts upon heating.  I have seen the temperature for decomposition listed as 100C (this was the listing on Wiki for about 3-4 months (possibly much longer before initial checking) but it is now listed as 235-280C as melting point and "decomposes" in parentheses. 

Amm Sulfate transforms to ammonium bisulfate by liberating a ammonia leaving (NH4)HSO4.  There is no listing of the decomposition of the bisulfate on Wiki.  It would seem that the decomp would produce NH3 + SO3 + H2O

Here is an excerpt from a PDF about Ammonium Sulfate http://celbar.com/wp-content/themes/celbar/assets/pdf/Ammonium%20Sulfate.pdf :
“ammonium sulfate begins to decompose at 100°C and yields ammonium bisulfate, NH4HSO4.” Reference (4) indicates that same thing, plus the fact that ammonium bisulfate, NH4HSO4, is “completely volatile on heating and decomposes at a temperature above 280°C (536°F).”


If ammonia gas was needed would heating the sulfate to 250F in a bottle with a hose attached - piping the gas into a receiving vessel be an option? 

As far as the bisulfate, is there any way to separate the SO3 and NH3?  It seems that water would absorb both producing the sulfate?