摘要
研究了NH_4Cl(s)焙烧氯化Pr_2O_3(s)制备PrCl_3(s)的热力学可行性、反应过程、适宜条件和动力学.结果表明:NH_4Cl(s)焙烧氯化Pr_2O_3(s)制备PrCl_3(s)在热力学上是可行的;氯化反应的过程为NH_4Cl(s)先与Pr_2O_3(s)生成2NH_4Cl·PrCl_3(s),然后NH_4Cl·PrCl_3(s)渐渐分解为PrCl_3(s);氯化反应的起始温度为457.35 K,497 K时反应进行完全;T≥643 K时PrCl_3(s)开始水解为Pr OCl(s);氯化焙烧温度理论上应控制在T≤643 K.制备PrCl_3(s)的适宜条件为n(NH_4Cl)∶n(Pr_2O_3)=12∶1、T=(623±10)K和t=40 min,氯化率为100%;氯化反应动力学符合Bagdasarrym模型,反应进度遵从Erofeev方程,氯化反应的表观活化能48.246 k J·mol^(-1),频率因子A_0为2.28×10~3,反应过程限制环节是界面化学反应控制.
Chlorination of Pr2O3 was studied by using NH4Cl^-roasted method using NH4 Cl and Pr2O3 as raw materials. The thermodynamics,the reaction process,suitable conditions and analytical dynamics of chlorination of Pr2O3 were researched. The results showed that thermodynamics analysis of chlorination of Pr2O3 was reasonable,and NH4 Cl priored Pr2O3 to producing 2NH4Cl·PrCl3,then decomposing into PrCl3. The spontaneous temperature of chlorination of Pr2O3 was 457.35 K,and finished one was 497 K.A suitable reaction condition was the 12 ∶ 1 of n（ NH4Cl） ∶ n（ Pr2O3）,（ 623±10） K,40 min,and100% chlorination rate. The analytical dynamics was agreement with corresponded to Bagdasarrym mold,the reaction progress conformed Erofeev equation,the apparent activation energy was 48.246 k J·mol^-1,and frequency factor（ A0） was 2.28×10^3. The reaction process was an interface chemical reaction.
出处
《化学研究》
CAS
2017年第1期97-101,共5页
Chemical Research
基金
河南省基础理论与前沿技术研究计划资助项目(092300410123)
