关于NH3对KCl和NH4Cl溶解度的影响的研究:显微镜视图
Ao Wang1, Xiaofu Guo1,2, Fei Li1,2
1Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China. lifei2008_ok@126.com.
Physical chemistry chemical physics : PCCP
|June 3, 2025
概括
将氨 (NH3) 添加到化 (KCl) 和化 (NH4Cl) 溶液中会改变它们的可溶性. 这项研究揭示了氨如何影响KCl和NH4Cl溶解度的微观机制,这对于优化从海水中提取至关重要.
科学领域:
- 物理化学 物理化学
- 解决方案化学 解决方案化学
- 材料科学 材料科学 材料科学
背景情况:
- 化 (KCl) 是一种重要的肥料,从海水中提取它通常涉及化 (NH4Cl) 作为化剂.
- 通过简单的蒸发从NH4Cl溶液中分离纯KCl是具有挑战性的,因为相位图的限制.
- 以前的研究表明,添加氨 (NH3) 可以在这些系统中诱导KCl结晶.
研究的目的:
- 阐明氨对KCl和NH4Cl在水溶液中的可溶性产生影响的微观机制.
- 了解氨在促进KCl结晶中的作用,以改善分离过程.
主要方法:
- 在室温下对KCl-NH3-H2O和NH4Cl-NH3-H2O溶液进行系统研究.
- 利用同步射线X射线散射 (XRS) 探测结构变化.
- 采用拉曼光谱和分子动力学 (MD) 模拟来进行补充分析.
主要成果:
- 随着氨度的增加,XRS显示KCl溶解度下降,这与原子间峰值强度的变化有关.
- 在NH4Cl-NH3-H2O溶液中增强的峰值强度表明N (A) -O (W) 和N (N) -N (A) 相互作用增加,这表明氨作为NH4+的溶剂起作用.
- MD模拟显示KCl-NH3-H2O中K-Cl协调和直接离子对接触增加,而NH4Cl溶解度在NH3中增加到23%.
结论:
- 将氨添加到KCl-NH3-H2O溶液中,会降低微小尺度上的KCl可溶性.
- 氨在NH4Cl-NH3-H2O系统中作为离子 (NH4+) 的溶剂,增加NH4Cl的溶解度.
- 了解这些微观相互作用是优化海水中的KCl分离和回收的关键.
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