文献类型：期刊文献

英文题名：Efficient Extraction of Phosphoric Acid with a Trialkyl Amine-Based Solvent Mixture

作者：Chen, Hang[1];Sun, Ze[1];Song, Xingfu[1];Yu, Jianguo[1]

机构：[1]E China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China

年份：2016

卷号：61

期号：1

起止页码：438

外文期刊名：JOURNAL OF CHEMICAL AND ENGINEERING DATA

收录：;EI(收录号：20160501860745);WOS:【SCI-EXPANDED(收录号:WOS:000368564600050)】；

基金：The authors acknowledge the financial support provided by National Natural Science Foundation of China under Grant 21206038, by a Specialized Research Fund for the Doctoral Program of High Education for New Lecturers under Grant 20120074120014, and by the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Phase equilibria - Mixtures - Organic solvents - Atmospheric pressure - Chlorine compounds - Extraction

摘要：Production of phosphoric acid by using wet process technology in China is challenging due to high impurities (P2O5 present is less than 25 wt %). Extraction of phosphoric acid from such low concentration mixtures needs to be improved. Moreover, the separation of chloride and phosphate ions is also important for the subsequent production of phosphate fertilizers. In this study, an organic solvent composed of trialkyl amine (N235), isoamyl alcohol, and sulfonated kerosene was developed to extract phosphoric acid. Pseudoternary phase equilibria, two phase densities, and the viscosities were determined at 298.15 K and atmospheric pressure. Results show that unlike other common organic solvents, the proposed solvent exhibits relatively higher extraction capacity even at low phosphoric acid concentration (P2O5 less than 25 wt %). The separation factor of chloride and phosphate ions reaches up to 39.45 and is several orders of magnitude lager than other common organic solvents including alcohols, cyclohexane, and tri-n-butyl phosphate (TBP). In addition, the solubility of organic solvent in the aqueous phase is close to zero, while the water content in the organic phase keeps nearly constant at a low concentration of around 5 wt %. All of these indicated that the developed solvent mixture is efficient for the extraction of phosphoric acid.