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Chemistry:The Central Science
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#Post#: 18--------------------------------------------------
Make your H2SO4 yourself
DIR By: Michel
Date: March 8, 2012, 8:29 am
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A replica of Lead chamber process!
HTML http://cavemanchemistry.com/cavebook/saltpeter3.html
a cheap method of preparing the most important chemical in
modern times.
What do you think of this method?
What are the likely impurities that can be found in H2SO4 from
the 'pop bottle chamber'
#Post#: 904--------------------------------------------------
Re: Make your H2SO4 yourself
DIR By: LikeCrazy
Date: October 16, 2012, 3:57 pm
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cool!! Anyone tried this?
#Post#: 1007--------------------------------------------------
Re: Make your H2SO4 yourself
DIR By: hkar19
Date: October 27, 2012, 11:39 pm
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can you explain the method here??
this is a explanation forum, not a mirrors of links.
#Post#: 1022--------------------------------------------------
Re: Make your H2SO4 yourself
DIR By: Michel
Date: October 30, 2012, 3:07 pm
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Sorry for late reply..been very busy this period and unable to
offer much time here.
Looks like the original article in the link isnt accessible for
some reason, I'll describe the process for feasible small scale
preparation of sulfuric acid.
The lead chamber process was an industrial method for
producing sulfuric acid. The basic chemistry involves burning
elemental sulfur in air to produce SO2, and oxidation of SO2 to
SO3 by nitrogen oxides, followed by dissolution of the SO3 in
water at the base of the chamber to produce Sulfuric acid.
S + O2 -----> SO2
nitrogen oxides can be produced by decomposing NaNO3 in the
presence of conc H2SO4
2NaNO3 + H2SO4 -----> Na2SO4 + NO2 + NO + O2
water at the base of the chamber dissolves the SO2 and NO2.
NO2 is hydrated to produce HNO2 and HNO3. HNO2 oxidises SO2 to
H2SO4, producing NO which goes up the chamber and is oxidised by
O2 present to NO2.
A scheme for scaling this down can involve igniting a mix of
S and NaNO3 using any heat resistant material that isnt attacked
by conc H2SO4, probably pyrex glass. The glass crucible and
its contents can be 'housed' in a large heat resistant plastic
container, filled to 1/6 of its volume.
Air is let in and the mix is ignited. The S reacts with NaNO3
and the vessel is sealed to prevent escape of gases.
3S+2NaNO3--->Na2S +2SO2+2NO
use a large excess of NaNO3 so that apart from the reaction
between NaNO3 and S, there will also be suffucient oxygen
generated by the NaNO3 decomposition to oxidise the NO to NO2,
and SO2 to SO3
S+O2--->SO2
NO+O2--->NO2
iv)SO2+NO2--->SO3+NO
the final step is the dissolution of SO3 in the water to produce
H2SO4
intermediates of nitrous acid, nitrosyl sulfuric acid are noted,
so purity of the final product is doubtful. If glass isnt strong
enough it may crack and the unreacted NaNO3 dissolves in the
solution and possibly evolves NOX. An evidence that the
reactions are completed is the decrease in the pressure of your
vessel due to dissolution of gases.
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