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    Sodium Sulphite

    Sodium Sulphite in Tradeasia

    IUPAC Name

    Sodium sulfite

    Cas Number


    HS Code




    Basic Info


    White Powder

    Common Names

    Sodium Sulphite


    25 Kg Bag

    Brief Overview

    Sodium sulphite is widely used as a food preservative to prevent fresh produce and meat from discolouring. It is used in flue-gas desulfurization process. It is widely used in paper and pulp industry as an agent to avoid corrosion problems. A solution of sodium sulphite is of pH 9 and when the solution is exposed to air they are oxidised to sodium sulphate.  

    Manufacturing Process

    Sulphur dioxide and sodium hydroxide when reacted together under laboratory conditions, produce sodium sulphite.

    2NaOH + SO2 → Na2SO3 + H2O

    In industrial level, sodium sulphite is produced by making sodium carbonate react with sulphur dioxide.  

    SO2 + Na2CO3 → Na2SO3 + CO2

    Food Industry 

    Sodium sulphite is widely used as a food preservative. It is added to fresh produce, canned foods, processed foods, and dry fruits to prevent discolouring and unwanted oxidation.

    Chemical Industry

    Sodium sulphite is widely used in water treatment as an oxygen scavenger agent to treat water being fed to steam boilers to avoid corrosion problems. It is also used in the textile industry as a bleaching, desulfurizing and dechlorinating agent and in the leather trade for the sulphonation of tanning extracts.

    Other Applications 

    Sodium sulphite is used in other applications, including froth flotation of ores, oil recovery, food preservatives, and making dyes. In chemical manufacturing, it is used as a sulfonation and sulfomethylation agent. Sodium sulphite is used in the purification of TNT for military use. It is also used in the production of sodium thiosulfate. 

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