September 2013

Special Report: Refining Developments

Improved oxidation process increases sulfur recovery with Claus unit

Since its development in 1936, the “modified Claus” technology has been the preferred process used by refineries and gas processing plants for the recovery of sulfur from acid-gas streams. M..

Vazquez, R. G., Seeger, D., Thundyil, M., GTC Technology US LLC

Since its development in 1936, the “modified Claus” technology has been the preferred process used by refineries and gas processing plants for the recovery of sulfur from acid-gas streams. Modern sulfur plants include a burner and a thermal reactor tied to a waste-heat exchanger as the first and second process units followed by a catalytic reaction section consisting of two or more catalytic converters. If sulfur recovery higher than 98% is required to meet the low-sulfur emission standards set by legislation, a tail-gas cleanup process must be included in the design of the sulfur recovery unit (SRU). The modified Claus process, however, has a number of operating challenges that ar

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