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| Bob |
 Posted: Mon Feb 07, 2005 5:14 am |
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Guest
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I use piranha solution sometimes (1 part 30% H2O2 + 3-4 parts H2SO4)
to clean substrates and glasswork that are optically clean but I need
to be sure.
This mix is well known for it's dangers, especially the formation of
organic peroxides such as acetone peroxide which is an unstable
primary explosive that may send boiling H2SO4 and glass shards flying
through the lab.
So I wonder about the use of KMnO4 instead of H2O2. It is also an
oxidant, it doesn't cause a temperature spike when mixing with
sulfuric and it is said to be an even more powerful mix than piranha.
Does KMnO4 form organic peroxides as well or does it just destroy
anything in it's path? Is this stuff as safe / less safe / safer than
piranha? |
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| Uncle Al |
| Posted: Mon Feb 07, 2005 11:58 am |
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Bob wrote:
[quote:10f6b18e30]
I use piranha solution sometimes (1 part 30% H2O2 + 3-4 parts H2SO4)
to clean substrates and glasswork that are optically clean but I need
to be sure.
This mix is well known for it's dangers, especially the formation of
organic peroxides such as acetone peroxide which is an unstable
primary explosive that may send boiling H2SO4 and glass shards flying
through the lab.
So I wonder about the use of KMnO4 instead of H2O2. It is also an
oxidant, it doesn't cause a temperature spike when mixing with
sulfuric and it is said to be an even more powerful mix than piranha.
Does KMnO4 form organic peroxides as well or does it just destroy
anything in it's path? Is this stuff as safe / less safe / safer than
piranha?
[/quote:10f6b18e30]
NO WAY! You will get brown oily Mn2O7 and that is a contact
explosive!
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf |
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| Al Gray |
| Posted: Mon Feb 07, 2005 11:43 pm |
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Bob wrote:
[quote:6500600ce5]I use piranha solution sometimes (1 part 30% H2O2 + 3-4 parts H2SO4)
to clean substrates and glasswork that are optically clean but I need
to be sure.
This mix is well known for it's dangers, especially the formation of
organic peroxides such as acetone peroxide which is an unstable
primary explosive that may send boiling H2SO4 and glass shards flying
through the lab.
So I wonder about the use of KMnO4 instead of H2O2. It is also an
oxidant, it doesn't cause a temperature spike when mixing with
sulfuric and it is said to be an even more powerful mix than piranha.
Does KMnO4 form organic peroxides as well or does it just destroy
anything in it's path? Is this stuff as safe / less safe / safer than
piranha?
[/quote:6500600ce5]
I remember many years ago in S M Kupchan's lab in Wisconsin, someone
mixed potassium permanganate and sodium dichromate and sulfuric acid, of
course. This resulted in a very big explosion blowing liquid all over
the lab.
Al Gray |
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