HOME < QVF < Commercial < Falling Film Hydrogen Chloride Absorber
 
 
Hydrogen chloride feed gas enters at the top of the falling film absorber and flows co-currently with weak acid coming from the tails tower.

Heat of solution released as a result of the absorption process is removed by the cooling water flowing in the shell side of the falling film unit.

Thus absorption is effected at lower temperatures enabling a higher concentration of acid to be produced.


 

Product acid at up to 38% hydrochloric acid leaves at the bottom of the falling film absorber at a suitable temperature for storage and is ready for pumping.

The remaining unabsorbed hydrogen chloride gas and any inert gases present leave at the bottom of the falling film unit and enter at the bottom of the tails tower.

Process feed water entering at the top of the tails tower absorbs the hydrogen chloride to form dilute hydrochloric acid.

The dilute acid flows by gravity to the top of the falling film absorber to serve as the liquid feed to the tubes.