Storage of carbon dioxide
released from lime

(22) 21.04.2023

(43) 02.11.2023

(57) The present invention relates to a method of producing calcium oxalate from calcium carbonate the method comprising 0 the steps of: (a) producing CO₂ by contacting calcium carbonate with at least one acid; (b) isolating the CO₂ produced from step (a); (c) contacting the isolated CO₂ with hydrogen to produce at least one formate; and (d) thermal treatment of the formate of step (c) to produce calcium oxalate and hydrogen.

(71) Evonik Operations GmbH, Essen (DE)

(84) ARIPO (BW, CV, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SC, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, 1E, IS, IT, LT, LU, LV, MC, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)