Process for producing sodium polysulphides from the elements sodium and sulphur

Abstract From the Canadian patent

The present invention relates to a process for producing pure sodium polysulphides directly from the elements sodium and sulphur. For this purpose the sodium and the sulphur under a protective gas, are dosed in a stoichiometric ratio corresponding to the desired polysulphide alternately into a melt of a polysulphide, while stirring vigorously in portions, measured such that on adding the sodium the reaction mixture remains in the state of a stirrable suspension and that on adding the sulphur the latter completely reacts to a polysulphide having the desired or a higher sulphur content.