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US 2001/0033824 A1Published application
Method for the preparation of anhydrous sodium sulfide
AssigneeDegussa AG
InventorAlfred Alig
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Abstract
A method for preparing anhydrous sodium sulfide having a content of at least 98 wt % Na2S, by drying hydrous sodium sulfide, having a water content of 35 to 45 wt %, wherein the hydrous sodium sulfide is provided as a solid or in liquified form, and is dried at an elevated temperature while being mixed and conveyed.
Claims5
A method of preparing anhydrous sodium sulfide having an Na2S content of at least 98 wt %, comprising drying hydrous sodium sulfide having a water content of 35 to 45%, provided as a solid or in liquified form, at an elevated temperature, while the hydrous sodium sulfide is being mixed and conveyed.
Dependencies are inferred from the claim text.