A thermodynamic analysis of the oxygen-heating calcium carbide synthesis process, where the endothermic calcium carbide synthesis is coupled with exothermic coke combustion, was conducted in order to select appropriate process conditions, in terms of reaction mechanisms, stoichiometry and heat coupling system. The results indicate that: (1) calcium carbide is most likely to be formed via a one-step mechanism (CaO+3C→CaC2+CO); (2) Four different systems having different ratios of feedstocks were analyzed and showed common features in that the equilibrium conversion rate increased with an increase in temperature or a decrease in pressure, and the conversion of the side reaction proceeding with calcium carbide initially increased, and then decreased with increasing temperature; (3) The heat matching feeds and matching conditions depend on the throughput and the purity of calcium carbide; coupling calcium carbide synthesis with coke combustion in a reactor is feasible under appropriate conditions.
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References
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