Process for the preparation of anhydrous sodium sulfide

Details Process for the preparation of anhydrous sodium sulfide Process for the preparation of anhydrous sodium sulfide

C - Chemistry, Metallurgy

01

B

C01B 17/38 (2006.01)

Patent

CA 2256134

The invention provides a process for the preparation of anhydrous sodium sulfide by heating sodium sulfide having a water content of about 35 to 45 % in a drier under reduced pressure, the temperature of the water-containing sodium sulfide to be dried being increased from approximately 20°C at the drier inlet to at least about 180°C at its outlet. Preferably, the apparatus is a contact-type drier, and the sodium sulfide is in a comminuted form, more particularly in the form of scales, lamellae or flakes having an edge length of from 5 to 8 mm. The method can produce anhydrous sodium sulfide having a content of at least about 98% Na2S.

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