FIELD: chemistry.
SUBSTANCE: present invention relates to a method of extracting and purifying sodium sulphide (Na2S), formed during desulphuration of oil residues. The method includes treating sludge containing Na2S, obtained during desulphuration of oil residues, with a mixture of at least one organic solvent and water. Further, the treated sludge is divided into an organic phase containing petroleum oil and an aqueous phase containing Na2S, and the aqueous phase is distilled to obtain Na2S, followed by purification thereof. The obtained sodium sulphide is oxidised followed by production of sodium sulphite.
EFFECT: simple method of extracting and purifying sodium sulphide and conversion thereof into sodium sulphite by avoiding use of a catalyst.
6 cl, 5 tbl, 10 ex
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