How to remove sulfate ions from hydrochloric acid
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The solution that comes to mind now is to add a small amount of barium chloride (in an enamel-lined reactor with stirring), carry out the reaction, and then filter to remove the resulting barium sulfate. There are two issues at present. First, it is necessary to determine what kind of filtering device should be used; consideration must also be given to how to handle the filter cake or filter elements, ensuring that the system is operational. In one case, is there any better way?
When looking for filter manufacturer, these are no problem at all for them.
Barium chloride will do; filtration is simple – using a filter press, vacuum filtration, or centrifugation is also possible.
Calcium sulfate still has some solubility in hydrochloric acid. It will introduce impurities.
The earliest method used for sulfate removal in brine in the chlor-alkali industry was the addition of barium chloride, along with Dow clarifiers, so that the precipitates could be filtered together with the salt sludge.
Okay, thank you. I’ll learn more about it
A literature article titled “Exploration of Methods for Removing Sulfate Ions from Hydrochloric Acid Produced as a By-product of Chloroacetic Acid” was found; the conclusion is that calcium chloride combined with PE filters should be used