| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which an anhydrous and high-purity sodium sulfide can be obtained. SOLUTION: Hydrous sodium sulfide is heated with an organic solvent incompatible with water at a temperature lower than the melting point of the hydrous sodium sulfide by 10-20 deg.C and the temperature is then slowly raised within the temperature range of 1-10 deg.C and kept at a temperature higher than the melting point of the hydrous sodium sulfide by 10-20 deg.C for 5-15 min to heat the hydrous sodium sulfide to the boiling point of the water-solvent mixture. Water of crystallization is distilled off by azeotropic distillation in a vacuum or under a reduced pressure to dry the hydrous sodium sulfide.
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