Extraction of chromium(VI) from acid solutions by tri-iso-octylamine.

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概要

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• Triisooctylamine (TIOA) was used to extract Cr(VI) from several acid solutions of HCl, HBr, HNO<SUB>3</SUB> and HClO<SUB>4</SUB>. The results were divided into two groups according to the acid solutions used: HCl and HBr, or HNO<SUB>3</SUB> and HClO<SUB>4</SUB>. Chromium(VI) is extracted according to an ion-exchange reaction which has been found for amine-Cr(VI) extraction systems. However, the ion-exchange mechanism holds only at low acidities. At high acidities, Cr(VI) is coextracted with HCl or HBr by TIOA.<BR>It was found that TIOA extracts Cr(Vl) as Cr<SUB>2</SUB>O<SUB>7</SUB><SUP>2–</SUP> from HClO<SUB>4</SUB> solution and as HCrO<SUB>4</SUB><SUP>–</SUP> from HCl, HBr, and NHO<SUB>3</SUB> solutions. An extraction model which could explain the distribution equilibria was proposed, and the extraction constants were then determined.

• The Society of Chemical Engineers, Japanの論文

著者

• Kuo Jen-feng

  Department Of Chemical Engineering National Cheng-kung University

• Chen Chuh-Yung

  Department of Chemical Engineering, National Cheng Kung University

• Huang Yaou-Huei

  Department of Chemical Engineering, National Cheng Kung University

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• The Performance of a Continuous Loop Tubular Reactor for Emulsion Polymerization of Styrene
• Extraction of chromium(VI) from acid solutions by tri-iso-octylamine.
• Chromium(VI) Complexation with Triisooctylamine in Organic Solvents.

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