osamafon
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a question
a ruschen book says that petn´s explosive energi is 5,9KJ/kg and rdx´s is 5,45 KJ/kg so as hmx why is petn not more powerful powerful then hmx??? I
read that hmx´s densyti is 1,91 g/cm3 and petn´s 1,77 g/cm3
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KABOOOM(pyrojustforfun)
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energy released from an ordinary flash is 8.989 KJ.kg-1 does it mean it's more powerful than HMX?!  energy is not the only factor of power, volume of gas and Vod influence the power. I have The Chemistry of explosives
(by Akhavan jacqueline) it has some formulas for caculating power of explosives. later I may bring some of the formulas.
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osamafon
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can I synt. petn with 58%HNO3 and H2S2O7. I read that it can`t synt. with mixed acids
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Microtek
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Mixed acids work just fine, as does H2SO4 + alkali metal nitrate though the yield suffers. You don't need pyrosulfuric acid, ordinary 96% works
fine.
I think the reason you might think it doesn't work, is that the product from mixed acid synthesis is more difficult to purify; small amounts of
sulfuric acid is trapped inside the crystals and can't be washed away. This is not a problem however, as PETN is so soluble in acetone, so a
simple neutralization of the acetone soln and precipitation with water makes it very pure.
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rikkitikkitavi
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xoo, that might not work, since you dont have SO4- ions in a concentrated sulfuric acid, but only HSO4-
H2SO4 + (SO4)2- = 2 HSO4-
and sodium bisulfate is much more soluble that sodium sulfate, anyway it is difficult to predict solubilites on non-water solutes (concentrated
sulfuric acid has no free water, only hydrates of sulfuric acid)
But you could of course distill nitric acid
with nitrates and sulfuric acid 
/rickard
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osamafon
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the patent says something like that petn can be made so 100g. PE to 500g. hno3 then a little petn forms if u add 500g. h2so4 more petn forms but its
not so dangerous if u add pe to h2so4 and this mix to hno3. h2s207 is something like oleum it makes more +NO2
OH-with hno3, with water H2S2O7+H2O=2H2SO4 does it not carbonises if I add pe to mix. I once mixed H2SO4 and NH4NO3 when I add
a drop of H2S04 formed 40-200ml brown NO2-NOx I never dried alkaliNO3. if alkali nitrates do not smoke- 100g.pe+500g.H2SO4+500g.HNO3/xg.NaHSO4
if I`m right is that so 2H30+ (-2)SO4
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