Breathe easy! No maddening pop-up, sticky, or floating ads on this site :-)

Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Regenerating loose ion exchange resin

August 7, 2010

Dear Sir/Madam,
I have a small mixed bed filter filled in with ionac nm 60 by 25 liters. I could separated both resins by simple steps because anion is lighter then cation. Now I want to regenerate both by HCl 5% and NaOH 4%. Since I don't have column or bed to do that I need your help how to do the regeneration.
Or I am asking you ; Could the resin be regenerated by immersing it in a small bowl? What I have in mind : I fill the bowl with regenerant of 5 and 4 % (volume is 12.5 liter each) and I immerse the resin in it for 30 minutes. There after I rinse and rinse them by replacing the water with clean water until the pH is 5.
Thanks so much for everybody's kind help.
Onma Bana

Onma Bana
operator - Jakarta, DKI, Indonesia

August 12, 2010

If you can make a good separation, then your procedure should work. Regeneration in a vessel with flow through the resin is much more effective, however, and will require much less rinse water. You can make a simple vessel with a short length of sewer pipe or large diameter PVC pipe.

For regeneration in a vessel, you need to use at least 9 kg of HCl (100% basis) for the cation resin and 6 lbs of sodium hydroxide (dry weight basis) per cubic foot of anion resin.

After rinsing, you will also need to re-mix the two resins in order to get good results. It is best to do this by bubbling oil-free air through the resins when there is just enough water to cover them.

Lyle Kirman

Lyle Kirman
consultant - Cleveland Heights, Ohio

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023, Pine Beach, New Jersey, USA