October 2005

Environment/Process Technology

Re-evaluate recycling options for the Claus unit

This simulation-based study finds that significant sulfur recovery capacity is attainable through recycling

Nagpal, S., Fluor; Sen, P. K., Engineers India Ltd.

What are the effects of recycling sulfur dioxide (SO2) on the Claus sulfur recovery unit (SRU)? Environmental laws restrict air emissions; thus, facility operators are hard pressed to remove and recover sulfur-containing compounds. The authors explore recycling the SO2-containing process stream for tail-gas treatment, including the Claus unit operation. This case history provides several good operating examples to consider when optimizing tail-gas treatment. THE STUDY A simulation-based evaluation of the effect of SO2 recycle on the Claus SRU is presented. A Gibbs-free energy minimization-based model was used. Findings from this study shows that significant capacity enhancemen

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