Chemical News

Sunday, October 7, 2007

LO-CAT Hydrogen Sulfide Oxidation System

The LO-CAT process is a patented, wet scrubbing, liquid redox system that uses a chelated iron solution to convert H2S to innocuous, elemental sulfur. It does not use any toxic chemicals and does not produce any hazardous waste byproducts. The environmentally safe catalyst is readily available and since it’s continuously regenerated in the process, less catalyst is used, more money is saved. This state-of-the-art technology is listed by the Environmental Protection Agency as maximum achievable control technology (MACT).

The LO-CAT technology is applicable to all types of gas streams including air, natural gas, amine gas, biogas, landfill gas, refinery fuel gas, etc. The liquid catalyst adapts easily to variations in flow and concentration. Flexible operation allows 100% turndown in gas flow and H2S concentrations. Units require minimal operator attention.

LO-CAT units can be designed for better than 99.9% removal efficiency.


The basic chemistry is identical for all three LO-CAT® system configurations. The LO-CAT® process absorbs H2S, ionizes H2S, oxidizes H2S to S, reduces iron, absorbs oxygen, then oxidizes iron. Hydrogen sulfide is thus converted to elemental sulfur using an environmentally safe chelated iron catalyst. The iron catalyst is held in solution by organic chelating agents that wrap around the iron ion in a claw-like fashion, preventing precipitation of either iron sulfide (FeS) or iron hydroxide [Fe(OH3)]. The LO-CAT process is based on reduction-oxidation (Redox) chemistry. Two different redox reactions take place -- one in the absorber section, which converts H2S to elemental sulfur, and one in the oxidizer section, which regenerates the catalyst.

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