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以焦炭作还原剂,利用天然金红石和氯气制备四氯化钛。在1173到1273 K的温度范围内,对肯尼亚天然金红石颗粒在间歇式流化床中的氯化反应热力学和动力学进行研究。体系的热力学分析显示:生成CO的反应在高温下占主导地位;若生成CO反应的比率η越大,且随着体系反应受温度的影响加剧,高温下反应的吉布斯自由能越负;同时,η增大,产物中TiCl4分压对反应的吉布斯自由能的影响趋于减小。应用气-固多相反应理论和流化床两相模型建立反应的数学模型,计算了气泡相和乳相中模型的各种参数,床层高度范围内氯气的平均浓度为0.3 mol/m3。结果表明:天然金红石氯化反应主要在乳相中进行,反应速率主要由界面反应控制。
Coke as reducing agent, the use of natural rutile and chlorine preparation of titanium tetrachloride. In the temperature range of 1173 to 1273 K, the thermodynamics and kinetics of chlorination of natural rutile particles from Kenya in a batch fluidized bed were investigated. The thermodynamic analysis of the system shows that the reaction of CO formation dominates at high temperature. If the ratio η of the CO reaction is larger, the Gibbs free energy of the reaction becomes more negative with the increase of reaction temperature. At the same time, η increases and the influence of TiCl4 partial pressure on the Gibbs free energy of the reaction tends to decrease. The gas-solid multiphase reaction theory and the fluidized bed two-phase model were used to establish the mathematical model of the reaction. Various parameters of the model in bubble phase and emulsion phase were calculated. The average chlorine concentration in the bed height range was 0.3 mol / m3. The results show that the chlorination reaction of natural rutile is mainly carried out in the milk phase, and the reaction rate is mainly controlled by the interfacial reaction.