plasma - 20-5-2002 at 19:17
Is it possible to extract sulfuric acid by detillation like this:
CaSO4 + 2H2O -> Ca(OH)2 + H2SO4
Thanks
Polverone - 20-5-2002 at 19:18
No, it's not possible to obtain sulfuric acid that way. In fact (and this is not meant as a flame) this post and your one on perchloric acid make me
think that you could really benefit from a good general chemistry book. Here in the US they are pretty easy to find at a used book store or thrift
store, especially if the store is near a university. I've gotten a number of books that were originally $60 or more for 2 or 3 dollars each at such
stores. Are there similar stores that you can access? If you have a fast internet connection and don't mind lots of English text, you can read about
how sulfuric acid was produced in the 1800s at http://bcis.pacificu.edu/~polverone/muspratt.html
PHILOU Zrealone - 20-5-2002 at 19:20
Actually, the reverse reaction is very very favourised and thus this one is almost unpossible!
Ca(OH)2 + H2SO4 --> CaSO4.xH2O + a lot of heat
Heating CaSO4.xH2O (gypsum) provides Paris plaster CaSO4 almost anhydrous, then when very strong heat is on it melts and maybe evolve some SO3 (SO2 +
1/2O2) to give CaO!
PH Z
plasma - 20-5-2002 at 19:21
What about this :
CaSO4 + 2C -> CaS + 2CO2
CaS + H2O2 -> Ca(OH)2 + S
S + O2 -> SO2
SO2 + ½O2 -> SO3
SO3 + H2O -> H2SO4
Or this :
CaSO4 + heat -> CaO + SO3 (probably needs high T)
SO3 + H2O -> H2SO4
Or this :
Use a iron pan in an air tight glas beaker. Fill some water in the beaker and let the iron pan float on it. In the iron pan is a mixture of sulfur 88%
and 12% saltpeter.Then light it and close the beaker.Do it few times.With this methode you can make an 70% sulfuric acid.
Or this :
FeSO4(H2O)7 + Heat -> H2SO4 + FeO + 6 H2O
Will any of the reaction occur ?
And if so which one is the best ?
this was posible but
menchaca - 13-3-2003 at 16:09
gernmans in world war I invented a method to obtain sulphuric acid from anhidrit a mineral with is composed from CaSO4 with almost no water
this method consisted in mix the anhidrit with coal,smashed stone and CaCO3 and heat it hardly into an enormous rotatory ovens,in these ovens they
obtained SO3 and a icredible resistant concrete!!! they took this SO3 and disolved it into water obtaining sulphuric acid.
Is incredible what a war can do isn it?
BASF - 13-3-2003 at 19:18
I was always interested in this process with "anhydrit".
Do you have further, more detailed info on it?- This would be great.
axehandle - 9-2-2004 at 04:24
Heating CaSO4 until it MELTS !?
That would require ENORMOUS temperatures.
As an example, when I was testing my newly built propane furnace, letting it burn the bentonite component of the insulation wall composition, I put in
a clay pot on top of a block of anhydrous (oven dried) CaSO4 as a spacer.
The furnace ran for 2 hours, the inside walls were a bright yellow, the clay pot was cracked in several places but glowed yellow-white! The
temperature must have been in the 1500 C range!
After the test burn, the gypsym block was completely intact.
I think equilibrium is slightly in favor of the reverse reaction... 