Xylene addition effects in thermal stage of claus reactors

Salisu Ibrahim, Ahmed S. AlShoaibi, Ashwani K. Gupta

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Experimental results are presented on the effect of xylene addition to H2S/O2 flames at equivalence ratio of 3.0 (Claus Condition) with respect to H2S and complete combustion of xylene. The results from the combustion of H2S/xylene mixture is compared with the baseline case of 100% H2S combustion to isolate the role of xylene addition in the Claus reactor. Combustion of H2S alone showed a decrease in its mole until it reached to an asymptotic minimum mole fraction value. This resulted in the formation of SO2 to a maximum mole fraction which subsequently decomposed from the formation of elemental sulfur through its reaction with H2S. Addition of small amount of xylene (0.5% and 1%) increased the asymptotic minimum value of H2S as well as the formation of H2 which provided oxidation competition between the formed H2 and H2S. Presence of xylene also triggered the formation of CH4 and CO which provided pathway on the formation of COS and CS2. The oxidation of CH4 and CO by SO2 and other sulfur radicals reduced the maximum mole fraction of SO2 but increased the subsequent rate of SO2 decomposition to increase the formation rate of elemental sulfur. These results show the direct impact of trace amounts of xylene in the feed stream on sulfur formation to reveal direct impact on the Claus reactor performance for sulfur capture.

Original languageBritish English
Title of host publicationFuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance; Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues
ISBN (Electronic)9780791846087
StatePublished - 2014
EventASME 2014 Power Conference, POWER 2014 - Baltimore, United States
Duration: 28 Jul 201431 Jul 2014

Publication series

NameAmerican Society of Mechanical Engineers, Power Division (Publication) POWER


ConferenceASME 2014 Power Conference, POWER 2014
Country/TerritoryUnited States


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