Preparation method of anhydrous Na2S and derivatives thereof

The invention discloses a preparation method of anhydrous Na2S and derivatives thereof, and belongs to the technical field of substance synthesis. The method comprises the following steps: in an inert gas or nitrogen atmosphere, fully reacting a phosphine sulfur compound R3PS with metal sodium in a non-polar hydrocarbon solvent or in the absence of a solvent to generate phosphino compounds R1R2R3P and Na2S, after the reaction is finished, separating solid Na2S from a reaction system by utilizing the property that Na2S is insoluble in an organic solvent, and separating the solid Na2S from the reaction system by utilizing the property that Na2S is insoluble in the organic solvent. Cleaning the solid Na2S by adopting an organic solvent, and performing vacuum drying to obtain anhydrous Na2S; the simple chemical formula of the phosphine sulfur compound is R3PS, and the R3PS is R1R2R3PS; the simple chemical formula of the phosphino compound is R3P, and R3P is R1R2R3P; r1, R2 and R3 are respectively and independentl