nelsonB - 24-1-2016 at 18:01
Hi
so i was thinking about something,
we can't reflux aqueous ammonia,
since its will just leave the solvent,
so i was thinking what about making a chemical reactor out of a paintball co2 bottle, its made of steel i doubt ammonia will attack steel,
so to get an idea about how much a paintball co2 bottle,
Carbon dioxide Vapor pressure
25 Celcius 6445.15 kpa
77 Fahrenheit 934.79 Psi
and water at the temperature that is require for the reaction
water Vapor pressure
130 Celcius 268.2 Kpa
266 Fahrenheit 38.9 Psi
logicaly water heated at 130 celcius exert less pressure than carbon dioxide at 25 celcius
so if we put an solution of ammonia in a paintball bottle and seal it and heat it to 130 celcius,
its should take it easily wihout breaking,
am i right ?
i need some idea for that pressure reactor,
need to handle ammonia solution (25%)
at 130 Celcius wihout anything escaping it for at least 3 hour
XeonTheMGPony - 24-1-2016 at 18:14
1800 psi mop
NH4 anhydrous will not attack steel
JJay - 24-1-2016 at 18:25
You could reflux with a Dewar condenser, couldn't you? Stainless steel holds up well against ammonia, regular steel not so well.... Also worth
considering is how pressure will affect the reaction.
nelsonB - 24-1-2016 at 19:20
i was thinking finding a way to put an enamel inside of the co2 bottle, incase of corrosion.
gsd - 24-1-2016 at 20:02
If it is only NH3 and Water, corrosion is not much of a problem. Ammonia Absorption Chillers are made from mild steel.
Your problem is not the vapour pressure of water at 130 Deg C. It is the vapour pressure of NH3 + Water system at that temperature. look up for that
in the Mollier diagram for NH3 + H2O.
gsd
nelsonB - 25-1-2016 at 08:19
one way to know if its gonna word, its to test it.
I wonder what would be the best way to get a stable temp
sensor inside or outside,
outside would be easier since there will be no stress by pression,
but its less accurate i think,
inside its harder but there more accurate but its could be prone to breakage
[Edited on 25-1-2016 by nelsonB]
nelsonB - 26-1-2016 at 15:17
another way i guess would be to not fill it full,
leaving some space so the pressure do not reach some critical high level