Process for the preparation of anhydrous, highly pure sodium sulfide

Process for the preparation of anhydrous, highly pure sodium sulfide with a content of at least 98 wt.% Na2S by drying water-containing sodium sulfide, wherein the water-containing sodium sulfide is heated with an organic solvent which is not water-miscible to 10 DEG to 20 DEG C below the melting po...

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Hauptverfasser:	KRESS, PETER, HAHN, HENRIK
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM COMPOUNDS THEREOF INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:	Process for the preparation of anhydrous, highly pure sodium sulfide with a content of at least 98 wt.% Na2S by drying water-containing sodium sulfide, wherein the water-containing sodium sulfide is heated with an organic solvent which is not water-miscible to 10 DEG to 20 DEG C below the melting point of the water-containing sodium sulfide, heated up in stages with temperature stages of 1 DEG to 10 DEG C and holding times of 5 to 15 minutes to 10 DEG to 20 DEG C above the melting point of the water-containing sodium sulfide, and heated up to the boiling point of the water-solvent mixture, and the water of crystallization is distilled off by azeotropic distillation in vacuo or under pressure.