Patent ID: 7833509

Claim:
A process for preparing hydrogen sulfide H 2 S by converting a reactant mixture which comprises gaseous sulfur and hydrogen over a solid catalyst ( 22 ), which comprises converting the reactant mixture at a pressure of from 0.5 to 10 bar absolute, a temperature of from 300 to 450° C. and a sulfur excess in a reactor, the sulfur excess corresponding to a ratio of excess sulfur to H 2 S prepared of from 0.2 to 3 kg of sulfur per kg of H 2 S prepared, wherein the reactant mixture is obtained by passing gaseous hydrogen through a sulfur melt ( 9 ) into a reactant region ( 10 ) of the reactor ( 1 ), the sulfur melt ( 9 ) having a temperature of from 300 to 450° C., wherein a line ( 30 ) is provided between the cooler ( 40 ) and the reactor ( 1 ), through which, the crude gas stream is passed in a direction from the reactor ( 1 ) into the cooler ( 40 ) and through which the recycled sulfur is passed in an opposite direction from the cooler ( 40 ) into the reactor ( 1 ).