September 2008

Special Report: Refining Developments

Dealing with increased hydrogen sulfide and ammonia resulting from higher desulfurization severity

New process most-effectively stretches sulfure recovery capacity

Anderson, M.C., Thiosolv LLC

Higher hydrotreating severity to meet cleaner fuels standards has increased the amount of sulfur and ammonia (NH3) that must be processed by the sulfur recovery system.1 A new process is a safe, cost-effective alternative to oxygen enrichment to increase the capacity of the sulfur recovery unit (SRU) to handle the increased load. Increased sulfur loadings. When hydrodesulfurization (HDS) severity is increased to reduce distillate sulfur to new specifications of 10 ppm for ultra-low-sulfur diesel (ULSD), the incremental amount of sulfur produced may be relatively small compared to the previous loading on the Claus unit. The relative increase in NH3 production is much larger. Older sulfur spec

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