The absorption technique in chemical engineering process operations relies on the ability of a liquid phase to hold within its body relatively large quantity of a gaseous component.

Hydrogen chloride gas demands a special attention by chemical process industries. It is usually a byproduct of chlorination process. This cannot be liberated in air since it is prohibited under statutory laws because of its hazardous nature.

Hydrogen chloride is readily absorbed by water. The problem is not hydrogen chloride's affinity for water, but how best to provide the gas access to the water. There are two basic widely accepted and used methods :

Almost all the absorption systems are centered around these two basic types. Both the absorption types have significant differences in the way they function. Under normal operating conditions, adiabatic absorber can produce maximum of  30-31% hydrochloric acid. While falling film absorber can produce maximum of 33-35% hydrochloric acid.




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