NH4Cl and HCl waste gas treatment
Posted: Thu Feb 08, 2024 8:35 am
Hi,
I am currently doing a literature review and simulation of palladium recovery . I have found book (Extractive metallurgy of nickel, cobalt and platinum group metals from Crundwell, Frank.)
I will be implementing an ignition unit where palladium will be recovered as pure metal while producing NH4Cl and HCl waste gases from thermal decomposition. This reaction occurs around 1000 celcius due to amonnia chloride sublimation temperature being around 500C.
The ignition reaction will be as follow: 3(NH4)2PdCl6(s) = 3Pd(s) +2 NH4Cl(g)+16HCl(g) + 2N2(g)
I wanted to collect this waste gas and treat it by wet scrubbing. My main goal is to turn the waste gas into NH4Cl(aq) without any additional species so that I can recycle it to my another process unit. From my inverstigation from patents and books for HCl(g), wet scrubbing with NH4OH(aq) or NH3 gas is an option according to a russian patent. I opted for NH4OH as it more available in industrial processes. My initial hypothesis is that waste gas NH4Cl(g) wont be reactinng with NH4OH(aq) but only turn into liquid by absorption, thus I have derived the following equation, and wanted to ask forum users if they think this reaction is feasible as well used in industrial wet scrubbing processes for HCl and NH4Cl waste gases.
The proposed wet scrubbing reaction:
NH4Cl(g)+ HCl(g) + NH4OH(aq) = 2NH4Cl(g)+H2O
Alternatively the reaction with steps:
NH4Cl(g) = NH4(+aq) + Cl(-aq)
HCl(g) + NH4OH(aq) = Cl(-aq) + NH4(+aq) + H2O(l)
NH4(+aq) + Cl(-aq) = NH4Cl(aq)
I am currently doing a literature review and simulation of palladium recovery . I have found book (Extractive metallurgy of nickel, cobalt and platinum group metals from Crundwell, Frank.)
I will be implementing an ignition unit where palladium will be recovered as pure metal while producing NH4Cl and HCl waste gases from thermal decomposition. This reaction occurs around 1000 celcius due to amonnia chloride sublimation temperature being around 500C.
The ignition reaction will be as follow: 3(NH4)2PdCl6(s) = 3Pd(s) +2 NH4Cl(g)+16HCl(g) + 2N2(g)
I wanted to collect this waste gas and treat it by wet scrubbing. My main goal is to turn the waste gas into NH4Cl(aq) without any additional species so that I can recycle it to my another process unit. From my inverstigation from patents and books for HCl(g), wet scrubbing with NH4OH(aq) or NH3 gas is an option according to a russian patent. I opted for NH4OH as it more available in industrial processes. My initial hypothesis is that waste gas NH4Cl(g) wont be reactinng with NH4OH(aq) but only turn into liquid by absorption, thus I have derived the following equation, and wanted to ask forum users if they think this reaction is feasible as well used in industrial wet scrubbing processes for HCl and NH4Cl waste gases.
The proposed wet scrubbing reaction:
NH4Cl(g)+ HCl(g) + NH4OH(aq) = 2NH4Cl(g)+H2O
Alternatively the reaction with steps:
NH4Cl(g) = NH4(+aq) + Cl(-aq)
HCl(g) + NH4OH(aq) = Cl(-aq) + NH4(+aq) + H2O(l)
NH4(+aq) + Cl(-aq) = NH4Cl(aq)