煤炭转化2017，Vol.40Issue(5)：74-80,7.
低温合成碳化钙的热力学分析与实验验证
Thermodynamical Analysis and Experimental Test of Calcium Carbide Synthesis
摘要
Abstract
In order to explore the possibility of the synthesis of calcium carbide at low temperature,the thermodynamics of calcium carbide synthesis from calcium oxide and carbon were studied,and the influence of reaction conditions on the CaC2 theoretical equilibrium concentration were discussed.Thermodynamic analysis results indicate that the lowest critical productiontemperature of CaC2 is the Taman temperature of CaO (1 442 ℃) and the reaction is very slow because of the restricted diffusion of the reactants.When the temperature is 1 882 ℃,CaC2 can be synthesized from solid CaO and C.With the increase of CaC2 content,solid CaO would change into liquid and the critical temperature of production will drop to 1 753 ℃.When the temperature is 2 222 ℃,CaC2 can act as an auto-catalyst to promote the formation of calcium carbide.When the content of CaO is excessive,the Ca vapor can not be absorbed by C in time,which can cause the loss of Ca and the quality reduction of calcium carbide.The further results show that the theoretical equilibrium molar fraction of CaC2 reaches 92.9 ％ when the temperature is 1 700 ℃ and CO pressure is 0.01 MPa.The thermodynamic analysis is verified by the experiments and CaC2 is synthesized when the temperature is 1 620 ℃ at Ar atmosphere.关键词
碳化钙/低温合成/热力学/理论摩尔分数/临界反应温度Key words
calcium carbide/low-temperature synthesis/thermodynamics/theoretical molar fraction/critical reaction temperature分类
化学化工引用本文复制引用
刘思源,陈思远,姜标,赵虹..低温合成碳化钙的热力学分析与实验验证[J].煤炭转化,2017,40(5):74-80,7.基金项目
上海市科学技术委员会基金资助项目(15DZ1206800). （15DZ1206800）
