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Citation: WEI Feng-Yu, WEI Hong-Yi. Complexation Extraction Mechanism of p-Aaminophenol[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1155-1157. shu

Complexation Extraction Mechanism of p-Aaminophenol

WEI Feng-Yu ^, ,
WEI Hong-Yi

1.
School of Chemical Engineering, Hefei University of Technology, Hefei 230009

Corresponding author: WEI Feng-Yu,
Received Date: 22 October 2004
Available Online: 20 April 2005

Complexation extraction of p-aminophenol(PAP) with bis(2-ethylhexyl)phosphoric acid(P204),tri-octylamine(TOA) or tri-butyl phosphate(TBP) was studied.The heat of reaction for each extraction was respectively-9.20 kJ/mol,-5.57 kJ/mol,-3.47 kJ/mol.FTIR analysis of the organic phases showed that the extraction mechanism depended on the complexing agent.Lewis acidic complexing agent P204 and Lewis alkaline complexing agent TOA with alkaline functional group -NH₂ and acidic functional group -OH of PAP respectively form complexes via ionic association,and neutral complexing agents TBP and TOA with group -OH of PAP via hydrogenbond association.A relationship between the extraction reaction enthalpy and the extraction mechanism was found.
- p-aminophenol,
- complexation extraction,
- extraction mechanism,
- extraction reaction heat
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