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HCl gas can be economically absorbed forming Hydrochloric acid of 30% (w/w) concentration which can be re-used in the main process. Thus this absorption is a pollution abatement as well as a recovery process.
The absorption can be done by two different methods :
1) Adiabatic Absorption : This method is suitable when inerts like air, Cl2, phenolic compounds etc are substantial.
2) Isothermal Absorption : This method is suitable when inerts like air, Cl2, phenolic compounds, etc are negligible.