The hydrogen chloride gas bubbles off and was discarded to atmosphere before gas absorption towers were introduced.
2.
Though SO 2 too passes through the tower it is unreactive and comes out of the absorption tower.
3.
Industrially, highly concentrated nitric acid is produced by dissolving additional nitrogen dioxide in 68 % nitric acid in an absorption tower.
4.
Hot sulfur trioxide passes through the heat exchanger and is dissolved in concentrated H 2 SO 4 in the absorption tower to form oleum:
5.
The exit gases from this stage contain both SO 2 and SO 3 which are passed through intermediate absorption towers where sulfuric acid is trickled down packed columns and SO 3 reacts with water increasing the sulfuric acid concentration.
6.
In this process the product gases ( SO 2 ) and ( SO 3 ) are passed through absorption towers twice to achieve further absorption and conversion of SO 2 to SO 3 and production of higher grade sulfuric acid.
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