Abstract
Abstract Experimental results are presented from the combustion of toluene with CO 2 and H 2 S gas in H 2 /O 2 –N 2 flames at an equivalence ratio of Φ = 3 (Claus condition). The results from the combustion of 100% H 2 S, H 2 S/C 7 H 8 and H 2 S/C 7 H 8 /CO 2 acid gases are also reported. The results showed a decrease in mole fraction of H 2 S and simultaneous evolution of SO 2 in H 2 S/H 2 /O 2 –N 2 flame. In contrast, combustion of H 2 S/C 7 H 8 acid gas showed faster initial SO 2 formation to a maximum mole fraction, but the formed SO 2 decomposed further downstream in the reactor. This is in further contrast to that of H 2 S/C 7 H 8 /CO 2 acid gas combustion, where CO 2 acted as an oxidizer (released atomic oxygen) that furthered SO 2 formation. The results also revealed the formation of CH 4 , C 2 H 2 and CS 2 with the addition of toluene. The presence of CO 2 enhanced the formation of mercaptans (COS and CS 2 ) and decomposition of formed hydrocarbons in the reactor. These results help to identify conditions under which hydrocarbons and mercaptans (COS and CS 2 ) are formed, and how they can be mitigated during sulfur and energy recovery from acid gases.
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