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A less-expensive process to recover CO2 from PSA offgas

By Gerald Ondrey |

At Achema 2012 (June 18–22; Frankfurt am Main, Germany), Union Engineering A/S (Fredericia, Denmark; www.union.dk) will be presenting its patented FlashCO2 process — both at the exhibition (Hall 9.1, Stand E29) and in a congress lecture (Monday, June 18th at 11:30 in the room Illusion 2). FlashCO2 enables liquid CO2 to be produced from H2 plants at a direct operating cost of around €20–30/ton — significantly lower than the €30–40/ton required using conventional chemical absorption processes, says Michael Mortensen, Union Engineering’s chief sales officer. FlashCO2 was developed to capture CO2 from the medium-rich CO2 offgas being purged from pressure-swing adsorption (PSA) units, which are typically used for product purification in H2 plants. FlashCO2 (diagram) combines conventional physical adsorption (using chilled methanol) and liquefaction technologies, and eliminates the requirement for steam stripping. Despite the relatively low CO2 concentration in H2 PSA offgas (40–55%), the integrated double-loop design makes the plant capable of producing food- and beverage-grade CO2 at costs competitive with more conventional CO2 sources, such as ammonia and bioethanol production. Also,…
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