Re: Liquox

At 10:40 PM 6/3/2004 +0200, you wrote:
>   Aqueous potassium permanganate is too weakly concentrated (6% sat. sol.)
>for efficient decomposition catalysis I read. Althought the Nazi's used it
>in their V2 propellant pumps; they did not use it in their jet motors (early
>Me 163A plane).

The Kistler K0 engines and Rotary ATV engines used potassium permanganate 
solutions, but by all accounts sodium or calcium permanganate are superior.


>   The Carus NaMnO4 (Liquox) is expensive and a strong oxidizer which attacks
>most organics (like skin). It is a mess to work with and leaves MnO2 stains
>and deposits everywhere. It is a potential explosive with some materials.
>Yes, you can efficiently remove MnxOy stains with aqueous 50 g hydroxylamine
>hydrochloride/L solution, but that is still a mess.
>   The calcium peramanganate is no longer for sale Carus Company told me.

$3 / lb of solution for something that you only need 1% of is not expensive 
at all -- $0.03 per pound of peroxide.

At 1% it doesn't really matter, but being an oxidizer does let you actually 
burn it with your fuel.


>   Why return to the EARLY Messerschmitt era? What is wrong with manganese
>acetate tetrahydrate?  The USP? It is cheaper and combusts and is not an
>oxydizer and forms no explosive mixtures. It dissolves in alcohols (fuel)
>and does not react with alcohols. Permanganates OTOH attack alcohols.
>   Att. is a solubility table of typical homogenous (liquid) hydrogen
>peroxide decomposition catalysts.

We had trouble dissolving much manganese acetate in water, but it was 
probably the same tap water issue we had with permanganate.  We should try 
it again with DI water.  While it didn't leave stains, it did still leave 
deposits.  Just about any dissolved solid is going to do that to some degree.

John Carmack