Unlike many gases that originate from air separation, where the list of potential impurities to deal with is relatively short, carbon dioxide (CO2) is commercially produced from an ever-increasing range of feedgas sources. The CO2 present is basically a ‘waste product’ from that source.
Examples include the burning of various types of fuels, products of acid neutralisation or chemical synthesis, natural wells, and also many types of biomass sources through the fermentation or organic degradation process (for example, biogas).
Potential CO2 impurities
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