HCl capture/reclaim

[steelsand]

Our plant produces a large amount of HCl vapor, with some H2SO4, in the off-gases. I am interested in not only capturing these emmissions (potentially above legal limits), but also collecting the acid as a product/semifinished product, to reduce a waste stream. The airstream is 225 deg F. Does anyone have a system that would capture and contain this acid, that would still be concentrated enough to use anywhere?

 

[Chance17]

You can make a 36% HCl solution with a simply scrubber and bottoms recirculation through a cooler.
But 36% is about the highest practical concentration.

 

[dogtop]

Here is some info that could help in getting started.

http://www.qvf.com/en/ProcessSystems_3/Mineral Acids/AbsorptionofHydrogenChloride.shtml

HTH