引用本文:
李德谦, 屠元珍. 2-乙基己基膦酸单(2-乙基己基)酯从盐酸溶液中萃取铁(Ⅲ)的机理[J]. 应用化学,
2016, 4(5): 15-19.
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.
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.
2-乙基己基膦酸单(2-乙基己基)酯从盐酸溶液中萃取铁(Ⅲ)的机理
摘要:
本文研究了HEH[EHP]的正辛烷溶液在不同浓度(0-10M)的盐酸介质中萃取铁(Ⅲ)的平衡规律,借助红外光谱测定和斜率法、饱和法研究了不同盐酸浓度下的萃取平衡反应,计算了浓度平衡常数。研究了温度对萃取平衡的影响,计算了萃取平衡反应的热力学函数。
English
ON THE MECHANISM OF EXTRACTION OF IRON(Ⅲ) FROM HYDROCHLORIC ACID SOLUTION BY 2-ETHYL-HEXYLPHOSPHONIC ACID MONO-2-ETHYLHEXYL ESTER
Abstract:
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.
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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