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Difference between revisions of "Gas fermentation"
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=== Pre-treatment === | === Pre-treatment === | ||
The input gas stream, containing the main constituents CO, H<sub>2</sub>, CO<sub>2</sub>, can also contain impurities such as particulates, tar, BTEX (aromatics grouped as benzene, toluene, ethylene, xylenes), sulfur compounds (e.g., H<sub>2</sub>S and COS), halogens, and other inhibiting gases. These are generated e.g., during [[gasification]] or [[pyrolysis]] and can be present in fluctuating quantities. Gas-fermenting microorganisms are able to grow in the presence of low levels of impurities, however, some impurities necessitate near complete removal. Particulates can be removed by cyclone separators and filters. Tars can be condensed and removed by quenching hot syngas, or can be reformed by heating at 800-900°C using | The input gas stream, containing the main constituents CO, H<sub>2</sub>, CO<sub>2</sub>, can also contain impurities such as particulates, tar, BTEX (aromatics grouped as benzene, toluene, ethylene, xylenes), sulfur compounds (e.g., H<sub>2</sub>S and COS), halogens, and other inhibiting gases. These are generated e.g., during [[gasification]] or [[pyrolysis]] and can be present in fluctuating quantities. Gas-fermenting microorganisms are able to grow in the presence of low levels of impurities, however, some impurities necessitate near complete removal. Particulates can be removed by cyclone separators and filters. Tars can be condensed and removed by quenching hot syngas, or can be reformed by heating at 800-900°C in accompaniment with [[heterogeneous catalysis]] using nickel or dolomite , generating additional syngas. | ||
== Process and technologies== | == Process and technologies== | ||