FIELD: chemistry.
SUBSTANCE: invention refers to production technology of concentrated sodium hydrosulphite solution. Saturated aqueous sodium sulphite solution prepared or produced in reactor is brought to contact with droplet concentrated hydrochloric acid. Thereafter additional quantity of solid sodium sulphite is introduced with continued hydrochloric acid loading. Herewith pH value of reaction mixture is kept at least 6±0.1 until solid phase nonpassing into solution is formed. Then pH value of reaction mixture is reduced to 3.5-4.5, and process is stopped.
EFFECT: long life product.
1 tbl, 7 ex
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