Process for the disposal of sulfur in the liquid state which comprises: a) transforming elemental sulfur into sulfanes having the general formula H.sub.2S.sub.n+1, wherein n is a number from 1 to 7; b) optionally mixing elemental sulfur in powder form with the liquid sulfanes, up to such a concentration as to guarantee the pumpability of the mixture; c) injecting the sulfanes liquid at room temperature into geological formations having a temperature lower than 150.degree. C.