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Fluorite
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Posts: 139
Registered: 26-12-2018
Location: United Arab Emirates
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I always thought that sulfuric acid will oxidize hydrogen sulfide to sulfur as sulfur dioxide does but after watching nilered zinc sulfide video https://m.youtube.com/watch?v=OfI-XpYAqM0&t=1702s
Oddly enough there's no reaction between the h2s and h2so4 although sulfuric acid is a stronger oxidizer than sulfur dioxide
Anyways is it possible to dilute sulfuric acid with water and then bubble h2s so it will remove all heavy metals and then concentrating again? This
can be useful for purifying sulfuric acid to remove lead when using lead electrodes and the result should be safe sulfuric (toxicitywise) is this
correct?
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zed
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Posts: 2284
Registered: 6-9-2008
Location: Great State of Jefferson, City of Portland
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Mood: Semi-repentant Sith Lord
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Umm. Purifying Sulfuric Drain Cleaner....Acid. What are the chances chromatography will work?
The idea being, to first heat the acid, which by some reports, causes it to badly discolor.
After which, the acid can be run through a short column packed with anhydrous CaSO4.
Is there a chance that the colored material will be slower to elute, than the H2SO4 itself?
Thereby leaving the crud stuck in the CaSO4, while the acid passes though, and is purified?
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rockyit98
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Posts: 283
Registered: 12-4-2019
Location: The Known Universe
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Mood: no mood is a good mood
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Concentrating H2SO4 without distillation (with flask ans some PTFE ) up to 98%
https://www.sciencemadness.org/whisper/viewthread.php?tid=15...
i made 98% maybe 99% H2SO4 using 35% acid
you don't need H2O2 because HOT H2SO4 is in it of its self powerful oxidizer.
"A mind is a terrible thing to lose"-Meisner
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Fyndium
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Registered: 12-7-2020
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I believe that distilling it is the best overall method considering that 1l and smaller flasks are very cheap, owing the sacrificiability if it
happens to crack. Generating sufficient heat is trivial with propane burner. Activated carbon, and bubbling air with aquarium air pump and bleeder
into the boiling acid are the single most effective methods to prevent bumping, because overhead stirring may be incompatible with ptfe due to extreme
heat.
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Antigua
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Posts: 155
Registered: 27-9-2020
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The cost of flasks would be the last of my worries when dealing with 300°C boiling hot concentrated sulfuric acid. Even thinking that it could
possibly crack makes me shiver.
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Sulaiman
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Posts: 3721
Registered: 8-2-2015
Location: 3rd rock from the sun
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I have distilled sulphuric acid at atmospheric pressure in cheap Chinese borosilicate glass over an open flame,
pay attention to anti-bumping measures as boiling conc. sulphuric acid bumps extremely violently,
potentially expelling boiling hot conc. sulphuric acid.
Just one accident or lapse of sanity can ruin the rest of your life !
extreme care required.
the process of distiling conc. sulphuric acid gives me a tight sphincter  
CAUTION : Hobby Chemist, not Professional or even Amateur
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