Method for the production of anhydrous alkali metal sulfide and alkali metal sulfide solution

Abstract

A method for producing an anhydrous alkali metal sulfide, which entails a) bubbling a solution of an alkali metal hydroxide in an aprotic organic solvent, such as N-alkylcaprolactam or N-alkylpyrrolidone, with hydrogen sulfide gas at a temperature between 50 and 250° C., thereby forming a product containing alkali metal hydrosulfide, and then b) terminating the hydrogen sulfide introduction after the system has come to contain substantially no water remaining therein, and heating the system, thereby effecting dehydrosulfurization to form the alkali metal sulfide.

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