Control of a process for producing free sulfur from hydrogen sulfide is accomplished by manipulating the flow rate of a feed stream containing oxygen to a furnace in such a manner that a desired proportion of the hydrogen sulfide fed to the furnace is converted to sulfur dioxide. The flow rate of a feed...http://www.google.fr/patents/US4100266?utm_source=gb-gplus-shareBrevet US4100266 - Control system for a sulfur process
