NH_4Cl(s)焙烧氯化Sm_2O_3(s)及其动力学研究  

Chlorination of Sm_2O_3 with NH_4Cl Roasting Method and Its Kinetics

作　　者：褚意新[1] 时文中[2] 左春山[2] 朱国才[3] 徐启杰[2] Chu Yixin Shi Wenzhong Zuo Chunshan Zhu Guocai Xu Qijie(College of Pharmacy,Henan University of Chinese Medicine,Zhengzhou 450046,China Department of Chemistry and Chemical Engineering,Huanghuai University,Zhumadian 463000,Henan China Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 102201,China)

机构地区：[1]河南中医药大学药学院,郑州450046 [2]黄淮学院化学与制药工程学院,河南驻马店463000 [3]清华大学核能与新能源研究院,北京102201

出　　处：《河南科学》2016年第11期1808-1811,共4页Henan Science

基　　金：河南省基础理论与前沿技术研究计划资助项目(092300410123)

摘　　要：研究了采用氯化铵焙烧氯化氧化钐的热力学、反应过程、适宜条件和动力学.结果表明:氯化铵焙烧氯化氧化钐(单斜)在热力学上是可行的,反应自发进行的最低温度为521.8 K,当温度高于576.89 K时Sm_2O_3(s)完全转化为SmCl_3(s);氯化反应的适宜条件为n_(NH_4Cl)∶n_(Sm_2O_3)=12∶1、T=350±10℃和t=40 min,氯化率为100%,使用2倍理论量的氯化铵是提高氯化率的关键;氯化反应动力学符合Bagdasarrym模型,反应进度遵从Erofeev方程,反应的表观活化能Ea为58.275 k J·mol^(-1),频率因子A_0为1.48×10~4,反应过程是界面化学反应控制.Chlorination of Sm2O3 with NH4Cl roasting method is researched. The research content in this workincludes thermodynamic feasibility,reaction process,suitable conditions and chlorination reaction kinetics. Theexperimental results indicate that the reaction is feasible in the thermodynamics. Initial temperature of chlorinationreaction is 521.8 K and chlorination reaction is basically completed in the theory about 576.89 K. Suitable conditionsof chlorination reaction are as follows：the best ratio of nNH4C∶l nSm2O3 =12∶1,the temperature of 350±10 ℃,the time of40 min and the chlorinating rate of 100% . The key to increase the rate of chlorination is used 2 times of thetheoretical amount of ammonium chloride. Kinetic results indicate that chlorination reaction kinetics accords withBagdasarrym model and the reaction process is followed Erofeev equation when the apparent activation energy ofreaction is 58.275 kJ·mol^-1 and the frequency factor is 1.48×10^4. The reaction process is controlled by the interfacechemical reaction.

关 键 词：氧化钐 氯化钐 氯化铵 反应过程 动力学 

分 类 号：O643.1[理学—物理化学] TF111.13[理学—化学]