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Monetizing coke-oven gas, while capturing CO2

By Gerald Ondrey |

A process that converts process gases, generated during the production of metallurgical coke, into marketable chemicals is being developed in a pilot plant installed on the works site of thyssenKrupp Steel Europe AG (www.thyssenkrupp-steel-europe.com) in Duisburg, Germany. The process is being developed in a collaborative project by the Schwelgern coke plant (KBS), plant-engineering company thyssenKrupp Industrial Solutions AG (Essen; www.thyssenkrupp-industrial-solutions.com) and Berlin Technical University (TU Berlin; all Germany; www.tu-berlin.de). In the conventional treatment of coke-oven gas (COG), H2S and NH3 are scrubbed from COG with aqueous ammonia solutions (de-acidified water, stripped water) by the CyclaSulf process. The rich absorption solution (enriched water) is pumped to the regeneration, H2S/NH3-desorption column. The head product of the H2S/NH3-desorption is acid gas, which is rich with H2O, NH3 (20–30 vol.%), CO2 (15–25 vol.%) and H2S. The rate of H2O, NH3 and CO2 in acid gas is nearly equimolar, which makes it possible to synthesize crystalline ammonium bicarbonate. In the new, patented process (flowsheet), the acid gas from the CyclaSulf process is first compressed (by acid-gas-condensate jet flow) in…
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