January 2003

Special Report: Gas Processing Developments

Consider optimized iron-redox processes to remove sulfur

New processing developments are overcoming operational obstacles of older units

Nagl, G. J., Gas Technology Products Division, Merichem Chemical & Refinery Services LLC; Heguy, D. L., Gas Technology Products LLC

The liquid redox technology is a firmly established method since the 1920s. The most widely used method is the "iron redox" process or the "chelated-iron" process; it efficiently removes sulfur in the form of hydrogen sulfide (H2S) from sour-gas streams. Typical processing applications include natural gas and associated-gas processing plants, refinery-fuel gas and more. Older systems can achieve 99.9+% H2S removal rate and treat a wide variety of gas types at varying processing conditions. This established technology offers substantial turndown capability with regard to H2S concentration, gas flowrate and production of i

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