Sodium Sulphide

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Application of Sodium Sulphide

  • Sodium sulfide is primarily used in the kraft process in the pulp and paper industry.
  • It is used in water treatment as an oxygen scavenger agent and also as a metals precipitant; in chemical photography for toning black and white photographs; in the textile industry as a bleaching agent, for desulfurising and as a dechlorinating agent; and in the leather trade for the sulfitisation of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of rubber chemicals, sulfur dyes and other chemical compounds. It is used in other applications including ore flotation, oil recovery, making dyes, and detergent. It is also used during leather processing, as an unhairing agent in the liming operation.

Reagent in organic chemistry

Na2S + 2 RX → R2S + 2 NaX
  • Even aryl halides participate in this reaction. Sodium sulfide can be used as nucleophile in Sandmeyer type reactions. Sodium sulfide reduces1,3-dinitrobenzene derivatives to the 3-nitroanilines. Aqueous solution of sodium sulfide can be refluxed with nitro carrying azo dyes dissolved in dioxane and ethanol to selectively reduce the nitro groups to amine; while other reducible groups, e.g. azo group, remain intact. Sulfide has also been employed in photocatalytic applications.