(319h) Exploring the Potential of Ni3S2 Based Sulfur Looping Process for Efficient Production of H2 from H2s: A Thermodynamic and Kinetic Study
AIChE Annual Meeting
Tuesday, November 15, 2022 - 2:10pm to 2:26pm
In this work, process analysis of sulfur looping was performed, and the results were compared against Claus process to establish the commercial feasibility of the process. Parametric studies were carried out on the sulfur looping process in ASPEN to obtain the reaction and feed conditions for both the sulfidation and regeneration steps. The thermodynamic results obtained were validated using relevant thermogravimetric experiments and X-ray diffraction analysis. After the conditions were determined through the combination of process simulations and experiments, system evaluation parameters such as overall H2S conversion, H2 and sulfur yield were calculated for the sulfur looping process and compared against the baseline Claus process. The thermodynamic performance was further quantified by carrying out energy and exergy analysis. Results indicate that for >99% H2S conversion, ~2.4% higher sulfur yield is obtained for the sulfur looping process with 100% selectivity towards H2 generation (no steam formation). Moreover, a significant increase of ~19% and ~8% in overall energy and exergy efficiencies, respectively was observed for sulfur looping process due to H2 production and requirement of fewer processing units. This work further corroborates the superior potential of the novel sulfur looping scheme to replace the existing Claus process as it overcomes its drawbacks and creates a valuable product from a toxic industrial waste. The findings from this study can be used to develop an economical and environmentally sustainable process.
 Jangam, Kalyani V., Anuj S. Joshi, Yu-Yen Chen, Shailaja Mahalingam, Ashin A. Sunny, and Liang-Shih Fan. "Synergistic decomposition of H2S into H2 by Ni3S2 over ZrO2 support via a sulfur looping scheme with CO2 enabled carrier regeneration." Chemical Engineering Journal 426 (2021): 131815.