| http://www.w3.org/ns/prov#value | - The crude gas purification system removes the NH3, CO2, H2 S, SO2, COS and other impurities to produce a purified synthesis gas containing essentially only methane, H2 and CO. The purified synthesis gas must be essentially free of sulfur compounds, i.e., less than 5 ppm and preferably less than 0.1 ppm, in order to prevent poisoning of the down-stream Fischer-Tropsch catalyst.
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