CO2 Stack Gas Recovery System is used to transform vent flue gas into a usable and profitable source of CO2. As compared to other sources, this is an economic source of CO2 as the gas produced by a stack gas recovery system is a by-product of flue gas production from boilers as well as from other flue gas sources. In the recovery system, there are installed stainless steel process towers and pumps for long equipment life and reliable performance for years.