Method of preparing Na2S (III)

摘要

A method of preparing sodium monosulfide by means of reacting sodium and sulfur under protective gas, wherein sodium monosulfide is placed in a first stage in a receiver in a finely distributed, solid state, the initial material is preheated to 120 DEG -150 DEG C. and sulfur and sodium are alternately added in the required amount ratio under intensive mixing, whereby the temperature of the reation mixture is maintained at 120 DEG -250 DEG C., and in a second stage the formed initial product is allowed to continue to react or postreact under continuation of the mixing at 250 DEG -480 DEG C., until a Na2S content of at least 95% by weight has been attained.