Synthesis gas ("syngas"), a gaseous mixture comprised mostly of H2 and CO, is produced by coal gasification. Syngas is utilized in the production of an array of chemicals and energy products including but not limited to methanol, ammonia, synthetic fuel (Fischer-Tropsch products), electricity, steel-making, synthetic natural gas (SNG), and hydrogen. The H2/CO ratio required for downstream product generation is adjustable with operational modifications and additional gas shift processes. Generally, the syngas contains unwanted compounds such as hydrogen sulfide, cyanides, and ammonia. Downstream processes are used to remove the unwanted compounds and to adjust the H2/CO ratio to its desired amount. These water-gas-shift reactions, acid gas removal technologies like RECTISOL® or amine-based designs, pressure-swing-adsorption and membrane separation can all be employed as required.

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