复分解法合成硝酸钾工艺改进  

Improvement of Synthesis of Potassium Nitrate by Double Decomposition

作　　者：袁桂梅[1] 张祺 王晓琴[1] 周倩 Yuan Guimei;Zhang Qi;Wang Xiaoqin;Zhou Qian(College of Science,China University of Petroleum(Beijing),Beijing,102249,China)

机构地区：[1]中国石油大学(北京)理学院,北京102249

出　　处：《中国现代教育装备》2022年第3期133-135,共3页China Modern Educational Equipment

基　　金：北京市高等学校教育教学改革项目“新工科背景下基于EPT-TEO理念的数理化公共基础课程群‘金课’建设”(编号:XM10720200132);中国石油大学(北京)教育教学改革项目“《无机化学和分析化学实验》创新创业类课程建设”(编号:XM10720170670)。

摘　　要：以KCl和NaNO_(3)为原料,利用复分解反应原理合成KNO_(3)。本实验根据溶解度的不同,在高温下通过热过滤除掉溶解度小的NaCl,再将滤液冷却、过滤得到KNO_(3)晶体产品,用莫尔法测定Cl含量并计算KNO_(3)纯度。针对此实验中溶液的浓缩程度、热过滤方式以及重结晶过程中存在的问题进行了改进。KNO_(3)crystals are synthesized by metathesis reaction with KCl and NaNO_(3)precursors.In this experiment,NaCl could be removed by hot filtration at high temperatures due to its smaller solubility.When the filtrate cools down,the second crystal product-KNO_(3)could be filtered and obtained,then measures chlorine content by using Mohr and calculates KNO_(3)purityfinally.In this paper,we report a way to address the problems during the process of solution concentration,hot filtration and recrystallization.We have demonstrated improved qualities of KNO_(3)crystals through this process.

关 键 词：复分解法 溶液浓缩 过滤方式 重结晶 

分 类 号：G642[文化科学—高等教育学] TQ131.13-4[文化科学—教育学]