Citation: Li Deqian, Tu Yuanzhen. ON THE MECHANISM OF EXTRACTION OF IRON(Ⅲ) FROM HYDROCHLORIC ACID SOLUTION BY 2-ETHYL-HEXYLPHOSPHONIC ACID MONO-2-ETHYLHEXYL ESTER[J]. Chinese Journal of Applied Chemistry, ;2016, 4(5): 15-19.
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The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)???19870505-1???Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)???19870505-2???HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)???19870505-3???HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)???19870505-4???FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements., The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements.
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