Hello Luvena,
After looking up some information, my guess is that Stamicarbon is using an old chemical reaction (I used back in the 1980's) to strip CO2.
Here are the common reactions:
2 NH3 + CO2 ↔ H2N-COONH4
The second is an endothermic decomposition of ammonium carbamate into urea and water:
H2N-COONH4 ↔ (NH2)2CO + H2O
This should help you calculate yields.
Best wishes,
Eugene