E228 Potassium hydrogen sulphite

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E228

Potassium hydrogen sulphite

 

 

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Potassium hydrogen sulphite or potassium bisulphite is a chemical compound with the chemical formula KHSO3. It is used during the production of alcoholic beverages as a sterilising agent. This additive is classified as E number E228 under the current EU approved food additive.[1]

It is made by the reaction of sulphur dioxide and potassium carbonate. The sulphur dioxide is passed through a solution of the potassium carbonate until no more carbon dioxide is given off. The solution is concentrated and then allowed to crystallise.

 


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