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Citation: Zhang Da-Li, Ke Jia-Jun, Lu Li-Zhu. Mutual Action of Di(2ethlhexyl)dithiophosphoric Acid and Trioctylamine and the Mechanism of Zinc Ion Extraction by them[J]. Acta Physico-Chimica Sinica, ;2001, 17(02): 189-192. doi: 10.3866/PKU.WHXB20010221 shu

Mutual Action of Di(2ethlhexyl)dithiophosphoric Acid and Trioctylamine and the Mechanism of Zinc Ion Extraction by them

1.
Institute of Chemical Metallurgy,Chinese Academy of Science,Beijing　100080

Received Date: 31 July 2000
Available Online: 15 February 2001

The extraction of zinc by di(2ethylhexyl)dithiophosphoric acid(D2EHDTPA)trioctylamine(TOA) was investigated.Conductance titration and interfacial pressure measurement showed that when D2EHDTPA and TOA were mixed they reacted and formed an electrolyte of ionic pairs.The extraction of zinc by the electrolyte was of antisynergistic nature,and the reaction was Zn2＋＋2BHA(O) → ZnA2(O)＋2B(O)＋2H＋ (subscript (o) stand for “oil phase”).The zinc extraction was an endothermic reaction ,the heat of reaction was 130.1 kJ•mol－1.Some phenomena of interface concerned were also discussed.
- Zinc;Solvent extraction;Antisynergism;Thio-substituted organophosphoric acid;Trioctylamine;Interface properties
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