欢迎访问过程工程学报, 今天是

›› 2014, Vol. 14 ›› Issue (6): 943-946.

• 反应与分离 • 上一篇    下一篇

氧化镁-氯化铵-水体系中氧化镁蒸氨机理

刘海豪 李明玉 贾光林   

  1. 暨南大学环境学院 暨南大学环境学院 暨南大学环境学院
  • 收稿日期:2014-09-29 修回日期:2014-10-29 出版日期:2014-12-20 发布日期:2014-12-20
  • 通讯作者: 李明玉

Distillation Mechanism of Ammonia by MgO in MgO-NH4Cl-H2O System

LIU Hai-hao LI Ming-yu JIA Guang-lin   

  1. Environmental School, Jinan University Environmental School, Jinan University Environmental School, Jinan University
  • Received:2014-09-29 Revised:2014-10-29 Online:2014-12-20 Published:2014-12-20
  • Contact: LI Ming-yu

摘要: 研究了MgO-NH4Cl-H2O体系中MgO蒸氨机理,考察了蒸氨效率与蒸氨时间的关系,用XRD分析了蒸氨过程体系中的固相组分,研究了MgO的水化及其作用,探讨了MgO蒸氨机理. 结果表明,MgO于蒸氨30 min内完全水化为Mg(OH)2;蒸氨机理可分为MgO水化完全前和水化完全后两阶段,水化完全前,MgO水化为体系提供了大量OH-,促进了蒸氨反应,此时OH-, MgO与Mg(OH)2共同起蒸氨作用;水化完全后,主要是Mg(OH)2起蒸氨作用.

关键词: 氯化铵, 氧化镁, 水化, 蒸发, 机理

Abstract: The distillation mechanism of ammonia by MgO in MgO-NH4Cl-H2O system was studied, the effect of time on the yield of ammonia and the solid-phase component and hydration of MgO in the system were investigated. The results show that MgO completely turns into Mg(OH)2 within 30 min in the system where the distillation mechanism of ammonia should be distinguished as two stages. The hydration of MgO provides much OH- to promote the ammonia distillation reaction in the first stage, with OH-, MgO and Mg(OH)2 participating in ammonia distillation together. After the hydration is completed, Mg(OH)2 plays the main role in ammonia distillation reaction in the second stage.

Key words: NH4Cl, MgO, hydration, distillation, mechanism

中图分类号: