Caustic scrubbing technology is used for removal of acidic pollutants in exhaust gas from different industries.A cylindrical column consist of packing materials and spray nozzles in which the contaminated gas is passed. Pollutants from the gas dissolve in the liquid based on the absorption technology. Spray nozzles are arranged in such a way that spray zones should cover cross sectional area of column. There is packing material in the tower to enhance contact between liquid and gas.

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Hcl gas is colorless, pervasive and corrosive, mostly emitted from process reactors, Hcl storage tanks while filling and laboratory.  Hcl gas emits easily from aqueous solution of concentrated hcl at atmospheric temperature and diluted hcl at higher temperature. The high vapour pressure of hcl tends to emit the fumes.

Nitrogen released from fuel combustion process reacts with oxygen and forms Nitric Oxide (NO). The Nitric Oxide is a colorless gas and it will be oxidized into Nitrogen dioxide (NO2) upon reacting with oxygen. This NO2 has odorous and acidic in nature, causes hazardous to human health and the environment, even in typically low concentrations.

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