乳液液膜法对水中对氨基苯甲酸分离富集的研究

A study on separation of p-aminobenzoic acid from wastewater using emulsion liquid membranes

用以磷酸三丁脂(TBP)为流动载体的乳液液膜体系对水中的对氨基苯甲酸(PABA)的分离富集进行了研究,考察了影响液膜分离富集PABA的各种因素,同时对PABA在不同pH值水溶液中的存在形态、PABA在液膜分离富集中的传质机理等进行了分析讨论。结果表明在适宜的乳液液膜操作条件下,对含有500mg/L对氨基苯甲酸的料液,经过一级液膜提取分离,对氨基苯甲酸的提取率可达99%,提取分离效果良好。

The separation and enrichment of p-aminobenzoic acid （PABA） using liquid emulsion membranes containing tributyl phosphate （TBP） was studied. The effects of the pH value of the external phase, the concentrations of surfactant L-113A and mobile carrier TBP in oil membrane phase, and the concentration of sodium hydroxide in the internal phase on the extraction ratio were studied respectively. And the mechanism of mass transfer of PABA and the existing states of PABA in solution of different pH were also discussed. The result indicated that, under the optimal operation conditions, the extraction ratio of PABA from the analogue waste water was able to reach 99% using the single stage membrane process when the concentration of PABA was 500 mg·L^-1 in waste water.