Large scale isolation of sulfur for commercial purposes is carried out through two main processes: the Claus process, and the Frasch process. The Clause process extracts sulfur from hydrogen sulfide that is produced through hydro-desulfurization of natural gas and petroleum; there are two steps two the Claus process. In the first step, the thermal process, hydrogen sulfide gas is heated in a combustion chamber to 1562 °F. Air is injected into the chamber to complete the reaction and produce sulfur dioxide and water. In the second step of the Claus process, the catalytic step, sulfur dioxide is reacted with hydrogen sulfur in a heated combustion chamber. Cooling temperatures cause condensation, and pure elemental sulfur and water are the products of the reactions.
The Fracsh process of sulfur isolation uses sulfur from underground reserves. During this process, holes are dug down into the sulfur deposits, pipes are interested into the holes, and superheated steam is forced down the pipes into the sulfur. The sulfur melts, and it is removed by pumping more air down a central pipe bringing the sulfur up to the surface.
