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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. shu

ON THE MECHANISM OF EXTRACTION OF IRON(Ⅲ) FROM HYDROCHLORIC ACID SOLUTION BY 2-ETHYL-HEXYLPHOSPHONIC ACID MONO-2-ETHYLHEXYL ESTER

Li Deqian ,
Tu Yuanzhen

1.
Chanchun Institute of Applied Chemistry, Academia Sinica

Received Date: 4 May 1986
Available Online: 24 October 1986

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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