ADP
Hazard to Others
Posts: 120
Registered: 4-4-2005
Location: USA
Member Is Offline
Mood: Productive
|
|
Determining amount of H2SO4 for given Nitration
Is there any certain method or calculation one can perform to determine the amount of H2SO4 to use as a catalyst/dehydrant in a given nitration? This
is after stoichiometry of the main reaction and assuming 98% H2SO4.
It appears to me that one uses three times as much H2SO4 as one does HNO3, but this isn't very precise considering conc. differences.
|
|
|
cyclonite4
Hazard to Others
Posts: 480
Registered: 16-11-2004
Location: is unknown
Member Is Offline
Mood: Amphoteric
|
|
The 3:1 H2SO4/HNO3 ratio is rule of thumb.
There is no correct, stoichiometric amount of H2SO4. As a catalyst, no definite amount is required. As a dehydrant, the more the better right? 
Don't be too worried about precision, the amounts of the acids used aren't calculated by concentrations, and don't need to be. Rule of
thumb.
\"It is dangerous to be right, when your government is wrong.\" - Voltaire
|
|
|
JohnWW
International Hazard
Posts: 2849
Registered: 27-7-2004
Location: New Zealand
Member Is Offline
Mood: No Mood
|
|
You should be mindful of the possibility that excessive H2SO4 may result in sulfonation occuring to produce a sulfonic acid, instead of a
nitro-copound, under circumstances which favor it.
|
|
|
vulture
Forum Gatekeeper
Posts: 3330
Registered: 25-5-2002
Location: France
Member Is Offline
Mood: No Mood
|
|
An aromatic sulfonate group is rapidly exchanged against a nitro group and might even aid in nitration (TNP synthesis for example).
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
|
|
|
ADP
Hazard to Others
Posts: 120
Registered: 4-4-2005
Location: USA
Member Is Offline
Mood: Productive
|
|
Thanks guys, I'll just find the amount that best fits the synth. Practice makes the perfect ratios...
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
