Reactive Extraction of p-Nitrophenol Using Tributylphosphate in Solvent Naphtha or n-Octanol
详细信息 查看全文
- 作者：Bing Cui ; Jing-Chao Gong ; Mu-Hua Duan ; Zhi-Xian Chang ; Ling-Ling Su ; Wen-Jing Liu ; De-Liang Li
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2016
- 出版时间：February 11, 2016
- 年：2016
- 卷：61
- 期：2
- 页码：813-819
- 全文大小：434K
- ISSN：1520-5134
文摘
In this work, the reactive extraction equilibrium of p-nitrophenol (PNP) using tributylphosphate (TBP) dissolved in solvent naphtha and n-octanol has been studied, respectively. The effects of equilibrium pH (pHeq), initial TBP, and PNP concentrations on the distribution ratio (D) and the degree of extraction were discussed. The TBP/solvent naphtha showed higher D values than that of TBP/n-octanol. The larger D values were also observed at pHeq in the range of 2–5.5. pHeq had negligible influences on the structure of TBP/PNP complexes based on IR spectra analysis. TBP mainly reacted with the neutral form of PNP by forming 1:1 (TBP/PNP) complexes through a hydrogen bond between phosphoryl in TBP and hydroxyl in PNP. The model parameters were calculated by fitting the experimental data. D values calculated from the model were in good agreement with experimental ones. In addition, the back-extraction rate was found to be reached 99.9% using 50 mmol·kg–1 NaOH as stripping agent.