Random
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Tannic acid extraction
How to extract tannic acid from plants?
[Edited on 31-5-2010 by Random]
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not_important
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http://www.sciencemadness.org/whisper/viewthread.php?tid=405...
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The WiZard is In
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People have been extracting tannic acid / tannins since
the stone age. Sorry to say it involves the use of extremely
hazardous Diprotium monoxide
This from Bretherick’s Handbook of Reactive Chemical Hazards. Sixth Edition 1999.
4475. Diprotium monoxide [7732-18-51
1. Carson, P. J. et al., Loss Prev. Bull., 1992, 102, 7
2. Anon. Safety Digest Univ. Safety Assoc., 1994, (50), 22 & 25
3. Editor's comments, 1999 An extremely reactive liquid, solid or vapour with a
dangerously high thermal capacity in both liquid and vapour state. When heated, the
commonest cause of mid-19th century industrial explosions; it also bursts containers on
cooling to low ambient temperatures. Still a frequent cause of vapour explosions today.
Reacts with many metals to give hydrogen, sometimes violently. With non-metals
pyrophoric hydrides may result. Frequently initiates explosive reactions between other
substances. Violent reactions with many non-metal and some metal halides and
oxyhalides, also with many organometallic compounds. Many metal nonmetallides
produce toxic, flammable or pyrophoric gases on contact with diprotium monoxide.
The oxide interacts exothermically with strong acids and bases. When heated to
decomposition, diprotium monoxide evolves the dangerous materials hydrogen, oxygen
and hydrogen peroxide (all have individual entries in this Handbook). For a few
incidents involving diprotium monoxide reactions see [1]. An opposed pair of explosions
from careless handling of diprotium monoxide are reported. A student cooled some
glass bottles of impure material in liquid nitrogen, they exploded surprisingly violently,
causing lacerations. A technician removed a heated carboy of the pure material from an
autoclave, a few seconds later it exploded (having presumably been superheated)
causing severe bums (these were lessened because she was not wearing safety type
footwear, which might have filled with the hot liquid, but open shoes able to drain) [2].
The editor has known injury result from safety footwear when diprotium monoxide at
only 70oC ran into it. He has himself emerged almost unscathed in sandals when it was
poured on his ankle at 100oC; a similar accident to a colleague wearing shoes
immobilised the victim for a week. Reading those Internet sites which cover chemical
safety, anecdotally, it is apparent that diprotiurn monoxide is almost level with nitric acid
as a cause of memorable mishap, usually by contact with unsuspected metal or metal
hydride traces, sometimes as a catalyst to solid mixtures of an oxidant and a reductant,
and occasionally through explosive boiling when heated [3]. In terms of human deaths
caused, the most deadly material in this Handbook, also the initiator of the single
chemical accident with the highest death toll. Too many potential cross-references to
list.
[Edited on 31-5-2010 by The WiZard is In]
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S.C. Wack
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Would you believe there are entire books on tannins. There are 3 different copies available at google for each of Henry Trimble's books ("The
Tannins").
[Edited on 31-5-2010 by S.C. Wack]
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The WiZard is In
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Quote: Originally posted by S.C. Wack  | Would you believe there are entire books on tannins. There are 3 different copies available at google for each of Henry Trimble's books ("The
Tannins").
[Edited on 31-5-2010 by S.C. Wack] |
-----------
I B-E-L-I-E-V-E and have been saved.
Do you believe there was in the state of Massachusetts a gallo-tannate based
Standard Record Ink?
http://tinyurl.com/2d8d28a
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Random
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Thanks, i thought gallic acid wasn't tannic acid 
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Random
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| Quote: Originally posted by The WiZard is In |
People have been extracting tannic acid / tannins since
the stone age. Sorry to say it involves the use of extremely
hazardous Diprotium monoxide
This from Bretherick’s Handbook of Reactive Chemical Hazards. Sixth Edition 1999.
4475. Diprotium monoxide [7732-18-51
1. Carson, P. J. et al., Loss Prev. Bull., 1992, 102, 7
2. Anon. Safety Digest Univ. Safety Assoc., 1994, (50), 22 & 25
3. Editor's comments, 1999 An extremely reactive liquid, solid or vapour with a
dangerously high thermal capacity in both liquid and vapour state. When heated, the
commonest cause of mid-19th century industrial explosions; it also bursts containers on
cooling to low ambient temperatures. Still a frequent cause of vapour explosions today.
Reacts with many metals to give hydrogen, sometimes violently. With non-metals
pyrophoric hydrides may result. Frequently initiates explosive reactions between other
substances. Violent reactions with many non-metal and some metal halides and
oxyhalides, also with many organometallic compounds. Many metal nonmetallides
produce toxic, flammable or pyrophoric gases on contact with diprotium monoxide.
The oxide interacts exothermically with strong acids and bases. When heated to
decomposition, diprotium monoxide evolves the dangerous materials hydrogen, oxygen
and hydrogen peroxide (all have individual entries in this Handbook). For a few
incidents involving diprotium monoxide reactions see [1]. An opposed pair of explosions
from careless handling of diprotium monoxide are reported. A student cooled some
glass bottles of impure material in liquid nitrogen, they exploded surprisingly violently,
causing lacerations. A technician removed a heated carboy of the pure material from an
autoclave, a few seconds later it exploded (having presumably been superheated)
causing severe bums (these were lessened because she was not wearing safety type
footwear, which might have filled with the hot liquid, but open shoes able to drain) [2].
The editor has known injury result from safety footwear when diprotium monoxide at
only 70oC ran into it. He has himself emerged almost unscathed in sandals when it was
poured on his ankle at 100oC; a similar accident to a colleague wearing shoes
immobilised the victim for a week. Reading those Internet sites which cover chemical
safety, anecdotally, it is apparent that diprotiurn monoxide is almost level with nitric acid
as a cause of memorable mishap, usually by contact with unsuspected metal or metal
hydride traces, sometimes as a catalyst to solid mixtures of an oxidant and a reductant,
and occasionally through explosive boiling when heated [3]. In terms of human deaths
caused, the most deadly material in this Handbook, also the initiator of the single
chemical accident with the highest death toll. Too many potential cross-references to
list.
[Edited on 31-5-2010 by The WiZard is In] |
I drank few glasses of the diprotium monoxide today and it looks I poisoned myself :O HELP!
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not_important
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It isn't, but tannic acid was long the only source of gallic acid, so when you've questions on obtaining one you need to look for both.
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Random
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| Quote: Originally posted by not_important |
It isn't, but tannic acid was long the only source of gallic acid, so when you've questions on obtaining one you need to look for both.
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Ok, by the way, how was this made I found on wikipedia?
http://upload.wikimedia.org/wikipedia/commons/d/d0/Bottle_of...
Is it a solution of something like oak bark?
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not_important
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Says "redwood" right there on it, likely a water extract of redwood tree bark meaning a dilute solution of tannic acid and related compounds, various
colouring matter from the bark, starch, sugars, some inorganic salts, and so on.
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psychokinetic
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100% of criminals tested came up positive for DPMO. Dangerous stuff.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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Random
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| Quote: Originally posted by not_important | Says "redwood" right there on it, likely a water extract of redwood tree bark meaning a dilute solution of tannic acid and related compounds, various
colouring matter from the bark, starch, sugars, some inorganic salts, and so on.
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I will try to make that extract from oak bark then 
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greentiger87
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Isn't tea basically a very dilute solution of plant tannins?
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