液膜法提取分离对氨基苯甲酸的研究

由磷酸三丁酯(TBP)、表面活性剂和煤油为油相,氢氧化钠溶液为内水相,含对氨基苯甲酸(PABA)的水溶液为料液(外水相),组成了W/O/W型乳状液膜体系,用乳状液膜法对料液中的PABA进行了分离富集研究。探讨了PA-BA在水中的形态分布及其液膜分离的传质机理,考察了表面活性剂种类、TBP质量分数浓度、外水相pH值和内水相氢氧化钠浓度等因素,对PABA传质分离的影响。结果表明,采用适宜的乳状液膜体系,在最佳的操作条件下,对含PABA浓度为500 mol/L的料液进行分离富集时,仅经一级液膜分离过程,PABA的分离提取率可达99%。

Study on separation of p-aminobenzoic acid with emulsion liquid membranes

Tributyl phosphate,surfactants and kerosene oil were used as oil phase of emulsion liquid membranes,and the solution of sodium hydroxide was internal phase and the solution of para-aminobenzoic acid was the feed(i.e.outer phase).The separation of para-aminobenzoic acid with emulsion liquid membranes was studied from the feed.The shape distribution of para-aminobenzoic acid and the mechanism of mass transfer were investigated.The effects of some factors of surfactants,the concentration of tributyl phosphate,pH in outer phase and the concentration of sodium hydroxide in internal phase on the separation and mass transfer of para-aminobenzoic acid were studied.The results show that under the conditions of optimal operation,the extraction ratio of para-aminobenzoic acid is 99% from the feed containing 500 mg/L para-aminobenzoic acid treated with single stage process of emulsion liquid membranes.