LaCl_3·7H_2O脱水过程研究

Study on Dehydration Process of LaCl_3·7H_2O

利用热分析仪研究了LaCl_3·7H_2O在不同升温速率、不同气氛下的脱水过程。结果表明,当升温速率为10℃/min时,在空气氛围下脱水过程分为三个阶段:在42.0～119.2℃、119.2～174.7℃、174.7～218.4℃三个温度范围内分别失去2、4、1个结晶水分子。当升温速率为10℃/min时,在CO2氛围下LaCl_3·7H_2O脱水过程也分为三个阶段:在38.3～109.9℃、109.9～161.2℃、161.2～196.2℃三个温度范围内分别失去3、3、1个结晶水分子。快速升温和提高反应气氛的氧化性均有利于LaCl_3·7H_2O的脱水过程。

The dehydration process of LaCl3 · 7H2 O at different heating rates in different atmospheres was studied by thermal analyzer. The results show that the dehydration process at 10 ℃/min heating rate in air atmosphere is divided into three stages：42.0-119.2 ℃ ,119.2-174.7 ℃ and 174.7-218.4 ℃ with crys- tal water loss of 2 molecules,4 molecules and 1 molecule,respectively. The dehydration process at 10 ℃/ min heating rate in CO2 atmosphere is also divided into three stages：38.3-109.9 ℃ ,109.9-161.2 ℃ and 161.2-196.2 ℃ with crystal water loss of 3 molecules,3 molecules and 1 molecule,respectively. Both rap- id temperature rise and increased oxidation of the reaction atmosphere are beneficial to the dehydration process of LaCl3 · 7H2O.