Extractive Separation of 4-Hydroxylpyridine with Co-extractant of Di(2-ethylhexyl) Phosphoric Acid and Tri-n-butyl-Phosphate
作者单位：Institute of Environmental and Analytical Sciences College of Chemistry and Chemical EngineeringHenan University
会议名称：《河南省化学会2016年学术年会》
会议日期：2016年
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学]
基 金：the financial support provided by the Science & Technology Research Project of Henan province (132300410237 14B610008 and 142300410127)
关 键 词：4-Hydroxylpyridine Co-extractant Di(2-ethylhexyl) phosphoric acid Tri-n-butyl-Phosphate
摘 要：In our previous work, reactive extraction using di(2-ethylhexyl) phosphate acid(D2EHPA) has been successfully used for the separation of 4-Hydroxylpyridine(4HP) from the aqueous solution. This study investigates the separation of 4HP by synergistic extraction. Several factors including the extraction agents,p H value,the concentrations of co-extractant and 4HP, which influence the co-extraction of 4HP are also studied. The obtained results suggest that the co-extractant of D2 EHPA and tri-n-butyl-phosphate(TBP) could more effectively be used to extract 4HP. Optimum conditions of synergistic extraction are obtained as follows: the molar ratio of D2 EHPA to TBP(Rs) is 2:1, the aqueous equilibrium p H is found to be one of the key factors that sharply affect the distribution ratio(D)values and the best p H is 4-4.8. Moreover, the extraction mechanism is analyzed by the Fourier infrared spectrum, and it is found that the reactive extraction of 4HP by D2EHPA+TBP is mainly driven by two mechanisms: the ionic association synthetic salt and hydrogen bond association.