Abstract: This research focused on the application of reverse osmosis membrane to treat the condensate water containing formic acid，acetic acid，propionic acid，butyric acid，pentanoic acid，carproic acid，isobutyric acid and 2-methyl-butyric acid. The effects of water temperature，pressure and pH on retention rate of organic acids，as well as the retention mechanism were discussed. The results indicated the concentration of butyric acid，pentanoic acid and 2-methyl-butyric acid in producing water were below detection limit when the experimental conditions of water temperature at 20— 40 ℃，pressure at 0.5—1.5 MPa，pH at 4—10. The retention rate of formic acid，acetic acid，propionic acid and carproic acid decreased with the increase of water temperature and increased with the increase of pressure and pH. The water production rate increased when both water temperature and pressure increased. The mechanic screening of reverse osmosis membrane and the charge effect between organic acid and membrane should have important influences on the retention effect of organic acids.

Key words: reverse osmosis membrane, organic acid, condensate water, retention rate

摘要： 采用反渗透膜对某制药厂含甲酸、乙酸、丙酸、丁酸、戊酸、己酸、异丁酸和2-甲基丁酸的凝结水进行处理，研究了进水温度、压力和pH值对凝结水中有机酸截留效果的影响，讨论了反渗透膜对有机酸的截留机理。研究结果表明：温度为20～40 ℃、压力为0.5～1.5 MPa、pH值为4～10时，产水中丁酸、戊酸、己酸和2-甲基丁酸的浓度低于检测限，甲酸、乙酸、丙酸和异丁酸的截留率随着压力和pH值增加而增大，随着温度升高而降低；产水率随着压力增大、温度升高而增大，不受pH值变化影响。说明反渗透膜对有机酸的机械筛除作用及膜与有机酸之间的电荷作用对有机酸的截留具有重要影响。

关键词: 反渗透膜, 有机酸, 凝结水, 截留率