摘要
研究了氯化铵焙烧氯化氧化钕的热力学、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钕在热力学上是可行的;氯化反应自发进行的最低温度为425 K,反应进行完全(K≥10~5)的理论温度为456 K;氯化铵首先与氧化钕反应生成2NH_4Cl·NdCl_3(s)中间复合物,而后2NH_4Cl·Nd Cl_3(s)受热分解为NdCl_3(s);氯化反应的适宜条件为n_(NH_4Cl)∶n_(Nd_2O_3)=12∶1、氯化温度320~340℃、氯化时间30 min,氯化率100%;过量的氯化铵是提高氯化率的关键;氯化反应的表观活化能Ea为52.73 k J·mol^(-1),频率因子A0为7.9×103.
NdCl3（s）is prepared in this work with roasting NH4Cl（s）and Nd2O3（s）. The reaction thermodynamics and its optional reaction condition as well as the reaction kinetics are investigated in this work. Initial temperature of chlorination reaction is 425 K and chlorination reaction is basically completed in the theory about 456 K. During the process,a intermediate of 2NH4Cl ·NdCl3（s）is produced,subsequently,the intermediate is decomposed after roasting at 320-340℃after 30 min to produce NdCl3（s）,and the best ratio is nNH4Cl∶nNd2O3=12∶1. The experimental results indicate that excess NH4Cl（s）is the key role to ensure the reaction yield,with the optional reaction ratio, the yields is nearly 100%. Kinetic results indicate that the activation energy is 52.73 kJ · mol^-1 and frequency factor A0 is 7.9×10^3.
作者
时文中
褚意新
左春山
朱国才
徐启杰
Shi Wenzhong Chu Yixin Zuo Chunshan Zhu Guocai Xu Qijie(School of Chemistry ＆ Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, Henan China College of pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 102201, China)
出处
《河南科学》
2016年第10期1657-1661,共5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)
关键词
氧化钕
氯化钕
氯化铵
反应过程
动力学
neodymium oxide
neodymium chloride
ammonium chloride
reaction process
kinetics
