... in and out.Gas absorption: SO 2 , SO 3 , NH 3 , CO 2 , H 2 S, HCl, Cl 2 , HF, NO X , organic solvents Gas ... stripping: NH 3 , CO 2 , O 2 , contaminated water by ... cooling Thermal power: Flue gas desulfurization Chemical industry: H 2 S, HCl, Cl 2 , HF, NO X elimination, organic solvents recovery Pulp industry ...