Extraction of p -aminophenol by D2EHPA, Alamine336 and their mixture were studied under various initial pH ranging 3-10.Both extractants extracted neutral form of p -aminophenol. When the pH value was between p K a1 a...Extraction of p -aminophenol by D2EHPA, Alamine336 and their mixture were studied under various initial pH ranging 3-10.Both extractants extracted neutral form of p -aminophenol. When the pH value was between p K a1 and p K a2 ,a maximum distribution ratio appeared. This pH dependence can be explained by varying the molar fraction of neutral PAP with pH value. The mixed solvent of D2EHPA and Alamine336 had a higher distribution ratio than either Alamine336 or D2EHPA alone, i.e. ,the extraction of p -aminophenol with the mixed solvent showed the synergistic effect,and the molar concentration ratio of D2EHPA to Alamine336 at 1∶1.5 was the synergistic point.展开更多
文摘Extraction of p -aminophenol by D2EHPA, Alamine336 and their mixture were studied under various initial pH ranging 3-10.Both extractants extracted neutral form of p -aminophenol. When the pH value was between p K a1 and p K a2 ,a maximum distribution ratio appeared. This pH dependence can be explained by varying the molar fraction of neutral PAP with pH value. The mixed solvent of D2EHPA and Alamine336 had a higher distribution ratio than either Alamine336 or D2EHPA alone, i.e. ,the extraction of p -aminophenol with the mixed solvent showed the synergistic effect,and the molar concentration ratio of D2EHPA to Alamine336 at 1∶1.5 was the synergistic point.
