Using sulphuric acid for regenerating resin
Using sulphuric acid for regenerating resin
(OP)
A customer of mine has asked me a question about the production of DM water, a section where I dont know much of.
They regenerate the resin with hydrochloric acid. The question is if they can do the same with sulphuric acid. They are allready using sulphuric acid in their main processes and it would probably skip a wastestream
They regenerate the resin with hydrochloric acid. The question is if they can do the same with sulphuric acid. They are allready using sulphuric acid in their main processes and it would probably skip a wastestream





RE: Using sulphuric acid for regenerating resin
Should be no problem. A few issues you would have to be careful about. If the feedwater has hardness, you will need to do a stepwise regeneration (starting with low sulfuric, then raising concentration) to avoid calcium sulfate precipitation on the resin. Also, sulfuric acid will tend to dehydrate and shrink the resin during regeneration, therefore, depending on the concentration used, the rinse cycle may get longer, so the resin can rehydrate. This shrink/swell cycle will also cause much more resin breakage. If they can continue with HCl, they should, it is much more efficient, but sulfuric is widely used for ion exchange resin regeneration.
RE: Using sulphuric acid for regenerating resin
RE: Using sulphuric acid for regenerating resin
RE: Using sulphuric acid for regenerating resin
RE: Using sulphuric acid for regenerating resin
we also used salt to make de-mineralized (DM) water for a lower pressure steam system (~600 psig). this was to exchange the Ca++ for Na+
the H2SO4 sounds like it should be a good deal. just make sure the resin is compatible and recalculate the volumes required to compensate for strength of acid. HCl is typically 34-36% and has a single H+ vs. the ~98% H2SO4 and two H+'s.