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deltaH
Dangerous source of unreferenced speculation
Posts: 1663
Registered: 30-9-2013
Location: South Africa
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Mood: Heavily protonated
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Very nice indeed Upsilon, it warms my heart to see such thorough reporting! VERY WELL DONE INDEED!
So now we know and I agree, not a practical route at all.
I suspect that sulfur's kinetics are sluggish because the rate limiting step might be that the S8 ring has to be cracked open. This happens fairly
quickly from 180C+, the typical temperature used for vulcanization. Unfortunately, this is also the temperature at which oxalic acid decomposes fairly
quickly, so catch 22.
Lime-sulfur, on the other hand, has its ring already opened into polysulfide anions, supposedly rich in the pentasulfide. This should react much
faster with a reductant like oxalic acid and precipitate insoluble calcium oxalate.
Since lime-sulfur is so easy to make (boil lime and sulfur for a long time and then filter), I'd say that's your simple and practical route to making
hydrogen sulfide.
Very nice work again!
[Edited on 2-10-2015 by deltaH]
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pneumatician
Hazard to Others
Posts: 409
Registered: 27-5-2013
Location: Magonia
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Mood: ■■■■■■■■■■ INRI ■■■■■■■■■■ ** Igne Natura Renovatur Integra **
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if you get the train from Barcelona to airport, the train stop in a station wall by wall with a chem plant. when the doors open, booooomm diret at
your nose H2S smell!! ALWAYS the same odor!!
http://www.sci-news.com/medicine/article00858.html
ancien egypt alchemist were very curious about "the soul odor"
no jokes about rotten souls please 
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