Catalysis 2023 Issue

• Soot generated at RGG causing increased pressure drop and flow restriction. These demanding conditions had likely been sustained since the early stages of the catalyst run. This means that these performance test results are indicative of EcoMax TG catalyst that has been severely deactivated. Yet, the perfor - mance test results show excellent conversion of SO2 and CO, good conversion of COS, and exceptional conversion of CS 2. At the various test conditions, the concentration of COS in the reactor effluent was measured between 15-22 ppmv dry. Importantly, no SO2 or CS 2 was detected in the reactor effluent at any test condition (detection limit <1 ppmv dry). Overall, the refinery has reported a positive experience with EcoMax TG as it has enabled it to meet its emissions targets, with two notable added benefits – first, the catalyst requires significantly less investment than other tail gas catalyst options. Second, it aligns with the company’s and Evonik’s overall goals of incorporating sustainable practices. The use of a regenerated or rejuvenated hydroprocessing catalyst (EcoMax TG) in tail gas treating can deliver significant environmental and economic gains for operators Conclusion Given the challenges facing the global refining industry, refineries are looking to evaluate their current practices to see how they can fully utilise their resources to improve efficiency and minimise environmental impact to secure a sustainable long-term future. Recycling hydroprocessing catalysts and extracting their beneficial components for use in TGTUs offers an effec - tive, efficient, and economical way to help refiners address these challenges. Operators of TGTUs now have the option to use a more sustainable catalyst without sacrificing per - formance or quality or having to change production meth- ods radically. In summary, the use of a regenerated or rejuvenated hydroprocessing catalyst (EcoMax TG) in tail gas treating can deliver significant environmental and economic gains for operators. Taking into account the benefits this trusted technology can provide, it would be beneficial for refiners to increase the use of reactivated hydroprocessing catalysts in their TGTUs. Brian Visioli is the Global Director, SRU/TGU & Purification Adsor - bents with Evonik. He has provided technical expertise and guidance for sulphur recovery applications around the world for more than 10 years and authored two patents. He holds a BS in chemical engineer - ing from the University of Colorado at Boulder. Email: brian.visioli@evonik.com

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