Biogas hydrogen sulfides

Sweetening. Another significant purification appHcation area for adsorption is sweetening. Hydrogen sulfide, mercaptans, organic sulfides and disulfides, and COS need to be removed to prevent corrosion and catalyst poisoning. They ate to be found in H2, natural gas, deethanizer overhead, and biogas. Often adsorption is attractive because it dries the stream as it sweetens. 

Biogas is normally composed of 60 to 70 percent methane and from 30 to 40 percent carbon dioxide with small amounts of hydrogen sulfide and other impurities. Because its major constituent is methane its properties closely approximate those of pure methane. The critical pressure of methane is 4710 kPa at -82.3 C. 

The exiting stream entered a separation tank where the biogas (CH4 + CO2) was removed from the liquid phase. The biogas then passed a bubble flask for visual observation, and finally a hydrogen sulfide scrubber before being measured in a gasometer. Ahead of the gasometer, samples could be withdrawn for gas analysis. 

Anaerobic Digestion - The complex process by which organic matter is decomposed by anaerobic bacteria. The decomposition process produces a gaseous byproduct often called "biogas" primarily composed of methane, carbon dioxide, and hydrogen sulfide. 

Hydrogen sulfide is present within natural gas and biogas, as well as being found in sufficient quantities in syngas to warrant removal [32,33]. The permeability of H2S through a range of polymeric membranes and their selectivity to CO2 is shown in Figure 11.3. 

Commercially, MCFCs are proposed by several vendors for biogas from anaerobic digestion processes of organic residues [37] and opportunity fuels such as landfill gas. These gases raise the issue of hydrogen sulfide poisoning, which is discussed in Section 3.2.2. 

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A Novel Enzymatic Technology for Removal of Hydrogen Sulfide from Biogas... 

A NOVEL ENZYMATIC TECHNOLOGY FOR REMOVAL OF HYDROGEN SULFIDE FROM BIOGAS... 

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