Abstract
The cement and lime industries are major contributors to the anthropogenic CO 2 emissions to the atmosphere. By combining the CO 2-releasing calcination of CaCO 3 with the CO 2-consuming dry-reforming of CH 4, and by further combining these endothermic reactions with the exothermic partial oxidation of CH 4, a single thermo-neutral process can be designed for co-producing CaO and syngas in an authothermal reactor. Syngas can be further processed to H 2, methanol, or Fischer–Tropsch chemicals. The conditions for thermo-neutrality are determined by thermo chemical equilibrium calculations. Such combined processes could achieve considerable CO 2 emission avoidance as well as fuel saving relative to the conventional production of CaO and syngas. A preliminary evaluation indicates favorable economics for the co-production of CaO and hydrogen or methanol from CaCO 3+O 2+H 2O and natural gas (NG) or coal.
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