Note: Sulphite can be spelt either as said or as Sulfite.
Sulphate can be spelt either as said or Sulfate.
See here for a detailed description of Chlorate removal from Potassium Perchlorate by Swede.
|Chemicals for the destruction of Chlorate|
|Sodium Metabisulphite Na2S2O5||Also called di-Sodium Disulphite or Sodium Disulphite or Sodium Pyrosulphite. This can be got at the local wine making store in the form of 'Campden tables' where it is used in wine making and sterilising. It is used as a food additive, E223. It is similar to Sodium Bisulphite, Metabisulphite being the dehydrated derivative of two molecules of Bisulphite.|
|Sodium Bisulphite NaHSO3||Also called Sodium Hydrogen Sulphite. It is used as a food additive, E222.|
|Sodium Sulphite Na2SO3||It is used as a food additive, E221.|
|Sulphur Dioxide SO2||Used in US Patent No. 2,392,769. It can be generated by burning sulphur or you can purchase in a cylinder. It is also used as a food preserver and disinfectant.It is a suffocating gas.|
Ferrous (II) Sulphate FeSO4:7H2O|
+ Sulphuric Acid
|Common names are Copras, Iron Sulphate, Green Vitriol. It is use for killing moss in lawns and can be got at the local garden store.|
|Ferrous Ammonium Sulphate (NH4)2SO4 .FeSO4:6H2O|
+ Sulphuric Acid
|Also called di-Ammonium Iron (II) Sulphate. It is somewhat expensive. Similar to Iron (II) Sulphate|
|Acids||HCl and others. Easy to obtain. You need to be careful of the ClO2and Cl2 gases produced.|
|Heat||The solid product can be heated so that all remaining Chlorate is converted to Perchlorate and Chloride|
Temperature control need to be accurate and the heating needs to be for the required time.
All the chemicals below work by reducing the Chlorate ion. The Sulphites have the same reducing power in dilute acidified solutions as Sulphur Dioxide. All the Sulphite and Sulphur Dioxide reactions take place in a similar manner. You can test for the presence of Chlorate in your product as per US Patent No. 2,392,769
Use K compounds if you need to keep Na out of your final product.
The Sodium Metabisulphite reactions take place according to:
First, the Metabisulphite dissociates:
Na2S2O5 + H2O <---->
2Na+ + 2H+ + 2SO32-
The Sulphite then reacts with Chlorate:
3SO32- + ClO3 - => 3SO42- + Cl-
The overall reaction is:
3Na2S2O5 + H2O + 2NaClO3 => 3Na2SO4 + 3H2SO4 + 2NaCl
There is more info. here on dissociations.
You can then neutralise the solution using Sodium Hydroxide which will give you more Sodium Sulphate and water.
H2SO4 + 2NaOH ==> Na2SO4 + 2H2O
2KClO3 + 4HCl ===> 2KCl + 2H2O + 2ClO2 + Cl2
This yellow gas is ClO2 and is explosive at concentrations above 10%. It is also very toxic, as is the Chlorine gas, and should not be inhaled under any circumstances. If using HCl, any excess acid can be gotton rid of by boiling. There should not be large amounts of Chlorate present (as with all the other methods) when adding acid. The solution is them basified with NaOH (or appropriate hydroxide or carbonate if you are concerned for the final colour that the produce will make when burned) and the presence of Chlorate should be checked for using some of the sensitive tests for Chlorate.
HCl acid can be purchased at the builders providers and is used for cleaning cement.
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