February 2009

Special Report: Clean Fuels

Improve operations of your Claus unit

New maintenance and operating procedures extend efficiency and service of sulfur recovery catalysts

ZareNezhad, B., Ministry of Science, Research and Technology, Semnan University

Thermal aging, hydrothermal aging, pore and surface blockage, sulfate poisoning and sulfur condensation are the most common causes of catalyst deactivation in Claus sulfur recovery units (SRUs). The Claus process is widely used to convert hydrogen sulfide (H2S) to sulfur. The operating requirements for Claus plants are dictated by processing operations of refineries and increasingly stringent emission control regulations. The Claus units must manage the ever increasing H2S loads generated by other refinery processing units. Refiners seek improved reliability of the Claus unit and its catalyst to manage higher sulfur loading for the refinery. Background. In the Claus process, recovery of el

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