关键词: 电渗析, 三羟甲基乙烷, 甲酸钠, 脱盐

Abstract: The content of sodium formate in trimethylolethane is one of the important indicators for product performance. Electrodialysis instead of ion exchange resin was used to remove sodium formate from trimethylolethane. The influence of operating conditions, such as operating voltage, initial concentration in dilute chamber, flow rate of dilute chamber, initial concentration in concentrated chamber on desalination effects were investigated. Desalination ratio could reached 95% at operating voltage 8V, dilute chamber initial concentration 0.15mol/L, dilute chamber flow rate 0.529cm/s, initial sodium formate concentration in concentrated chamber 0.01mol/L. Electrodialysis could be used to remove sodium formate from trimethylolethane effectively. For environmental and resource consumption concerns, electrodialysis is better than ion exchange resin for removing sodium formate from trimethylolethane.

Key words: electrodialysis, trimethylolethane, sodium formate, desalination