1) German invention
Found on
https://www.crosswordclues.com/clue/claus-process
The Claus process is the most significant gas desulfurizing process, recovering elemental sulfur from gaseous hydrogen sulfide. First patented in 1883 by the scientist Carl Friedrich Claus, the Claus process has become the industry standard. The multi-step Claus process recovers sulfur from the gaseous hydrogen sulfide found in raw natural gas and...
Found on
http://en.wikipedia.org/wiki/Claus_process
(from the article `sulfur`) ...pyrites, and smelter gases from the processing of copper, zinc, and lead ores. In most cases sulfur is separated from other gases as hydrogen ...
Found on
http://www.britannica.com/eb/a-z/c/94
No exact match found.
