Process of reacting silicone with hydrothermal or supercritical water

A process for reacting silicone with hydrothermal water at temperatures from 140° C. or supercritical water to give a solids mixture containing silicon,

• wherein the term “silicone” encompasses oligomeric or polymeric organosiloxanes in which silicon atoms are bonded via oxygen atoms and in which at least some of the silicon atoms carry one or more organic substituents, and also compositions comprising organosiloxanes.