Separation of Amine Salts by Electrodialysis
Amines, especially alkanolamines, are widely employed as absorbents to immobilize CO2, SO2, and other air pollutants. However, the amine salts formed in these pollution control systems will deteriorate the operation efficiency and stability if accumulated in the circulation, and cause a second pollution and waste of resources if discharged without treatment. This paper reported a technique—bipolar membrane based electrodialysis (BMED), which was used to separate and regenerate amines in situ. The sulfates of piperazine (Pz), monoethanolamine (MEA), diethanolamine (DEA), and N,N-dimethylethanolamine (DMEA) were chosen as the model amine salts for experiments, and the process cost was estimated to be 1.08, 0.48, 0.32, and 0.30 $/kg for Pz, MEA, DEA, and DMEA, respectively. Compared with ion exchange and conventional electrodialysis, BMED is a better choice since it can not only separate and regenerate the absorbents and keep the circulation steady and stable for a much longer time, but also achieve the recycling of resources and avoid second pollution. Furthermore, BMED will be more economically attractive as the bipolar membrane cost decreases and pollution control is strengthened.
Separation Organic amine salts Bipolar membrane Electrodialysis
Chuanhui Huang Tongwen Xu
Laboratory of Functional Membranes, School of Chemistry and Material Science,University of Science and Technology of China, Hefei 230026 P.R.China
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）