氯化铵焙烧氯化氧化钆及其动力学研究  

Study on Chlorination of Gd_2O_3 with NH_4Cl Roasting Method and Its Kinetics

作　　者：时文中[1] 褚意新[2] 左春山[1] 

机构地区：[1]黄淮学院化学与制药工程学院,河南驻马店463000 [2]河南中医药大学药学院,河南郑州450046

出　　处：《广州化工》2016年第20期37-39,共3页GuangZhou Chemical Industry

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

摘　　要：研究了氯化铵焙烧法氯化氧化钆制备无水氯化钆的适宜条件和动力学。结果表明：采用氯化铵焙烧氯化氧化钆制备无水氯化钆的适宜条件为nNH4Cl∶nGd2O3=12∶1、T=340~350℃和t=40 min,氧化钆的氯化率为100%;氯化铵与氧化钆的物质的量之比是影响氯化率的最主要因素,使用过量的氯化铵是制备高纯度无水氯化钆的关键。氯化反应是气-固多相区域反应,动力学曲线符合Bagdasarrym模型,反应进度遵从Erofeev方程ln[-ln（1-αRE）]=lnk＋nlnt,反应的表观活化能Ea为68.254 k J·mol^-1,频率因子A0为1.3×10^5,氯化反应的过程限制环节属于界面化学反应控制。Chlorination of Gd2O3 with NH4Cl roasting method was researched and the research content was investigated,including suitable conditions and kinetics. The experimental results indicated that suitable conditions of the chlorination reaction were as follows： the best ratio of nNH4Cl∶ nGd2O3 was 12 ∶ 1,temperature was 340 ~ 350 ℃,in 40 min,chlorinating rate was 100%. The most main influence factor of chloride rate was the molar ratio of NH4 Cl and Gd2O3,the key of the preparation of high purity anhydrous gadolinium chloride was the use of excessive ammonium chloride. Chlorination reaction was gas-solid multiphase area reaction,the kinetics curve accords with Bagdasarrym model,reaction process followed Erofeev equation ln[-ln（ 1-αRE） ]=lnk＋nlnt,apparent activation energy Ea of reaction was 68. 254 k J·mol^-1,frequency factor A0 was 1. 3× 10^5,the restrictive link of reaction process was controlled by the interface chemical reaction.

关 键 词：氯化铵 氧化钆 焙烧 氯化反应 动力学 

分 类 号：O643.1[理学—物理化学] TF111.13[理学—化学]