November 2005

Special Report: Plant Safety and Environment

Update your sulfur management program

Flexibility of liquid redox processing can optimize refinery sulfur handling

Nagl, G. J., Gas Technology Products Division, Merichem Chemical & Refinery Services LLC

Sulfur recovery via iron-based, liquid redox processing is well established and a commercially proven approach to refinery sulfur management. The attractive inherent feature of iron-based, liquid redox processing is its ability to process many gas streams such as fuel gas, amine acid gas and sour-water stripper (SWS) gas. Consequently, for refineries with Claus plants, the liquid redox process can be used as a tail-gas treatment unit, with or without a hydrogenation/ hydrolysis unit. Also, SWS gas can be directly processed with this method; relieving some processing burden of the Claus unit. The inherent characteristics of liquid redox processing include 100% turndown in respect to

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