Recovery Costs Less

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Courtesy of Xebec Adsorption Inc.

Bal K. Kaul, Ajit Sapre and Lei Zhang, ExxonMobil Research and Engineering Co. and Daryl Musselman and Surajit Roy, Quest Air Technologies, describe a new low cost H2 recovery process.

Hydrogen recovery from fuel gas and hydrogen containing purge gas streams in refinery and chemical processes offers many potential benefits including process uplift, reduced hydrogen costs, avoidance of H2 plant expansion, and emission reductions, but it requires a cost effective separations technology to be economical. Rapid cycle pressure swing adsorption (RCPSA) technology offers a more compact, less expensive and more energy efficient solution for H2 recovery compared to conventional PSA technology. RCPSA technology was jointly developed by ExxonMobil Research and Engineering Company (EMRE) and QuestAir Technologies and resulted in a large scale commercial product, the QuestAir H-6200, currently in commercial demonstration at an ExxonMobil refinery.

Figure 1 shows a full scale commercial unit deployed at an ExxonMobil refinery site. This unit was completely fabricated on a skid in a shop and then transported to the refinery site for tie-ins. Full shop fabrication provides significant cost benefits and allows for better quality control in terms of meeting local site codes, etc. Unlike conventional PSA, the H-6200 plant is compact enough to be entirely skid mounted. The small size and simplicity leads to reduced installation costs, and makes it possible to expand processing capacity to match incremental increases in hvdroaen demand. For the ExxonMobil

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