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Citation: Shen Jinglan, Xi Zhengkai, Gao Zili, Sun Sixiou, Li Fenghua, Liu Jiming. KINETICS OF SOLVENT EXTRACTION PROCESS Ⅰ.EXTRACTION OF CHROMIUM(Ⅲ) WITH HEH(EHP) FROM SULFATE SOLUTION[J]. Chinese Journal of Applied Chemistry, ;1984, 1(4): 60-67. shu

KINETICS OF SOLVENT EXTRACTION PROCESS Ⅰ.EXTRACTION OF CHROMIUM(Ⅲ) WITH HEH(EHP) FROM SULFATE SOLUTION

1.
Department of Chemistry, Shandong University, Jinan

Received Date: 18 April 1984
Available Online: 12 June 1984

Kinetics of the extraction of chromium(Ⅲ) with HEH(EHP) in kerosene solution from aqueous sulfate solution has been studied. To interpret the experimental results of the influence of the concentration of chromium(Ⅲ),extractant,hydrogen ion and sulfate radical on the rate of extraction, a mecha-nism for the extraction is proposed Cr(OH)₂⁺+(HA)_I_k-1???19840411???(Cr(OH)₂A)_I+H⁺ (Cr(OH)₂A)₁+(H₂A₂)_o_k-1???19840411???(CrA₃)_o+2H₂O For Cr(Ⅲ)exists in various forms in aqueous solution [Cr(Ⅲ)]total=[Cr⁺³]+[Cr(OH)²⁺]+[Cr(OH)₂⁺]+[CrSO₄⁺] the rate of the extraction can be expressed as followsR=(k₁K₂[Cr(Ⅲ)][HA]_I[H₂A₂]。)/(k_-1[H⁺]+k₂[H₂A₂]。)(1/β₁β₂)(H⁺]²+1/β₂[H⁺]+1+a/β₁β₂[H⁺][SO-4^2-])-(k_-1k_-2[CrA₃]。[H⁺]/(k_-1[H⁺]+k₂[H₂A₂]。)), Kinetics of the extraction of chromium(Ⅲ) with HEH(EHP) in kerosene solution from aqueous sulfate solution has been studied. To interpret the experimental results of the influence of the concentration of chromium(Ⅲ),extractant,hydrogen ion and sulfate radical on the rate of extraction, a mecha-nism for the extraction is proposed Cr(OH)₂⁺+(HA)_I_k-1(Cr(OH)₂A)_I+H⁺ (Cr(OH)₂A)₁+(H₂A₂)_o_k-1(CrA₃)_o+2H₂O For Cr(Ⅲ)exists in various forms in aqueous solution [Cr(Ⅲ)]total=[Cr⁺³]+[Cr(OH)²⁺]+[Cr(OH)₂⁺]+[CrSO₄⁺] the rate of the extraction can be expressed as followsR=(k₁K₂[Cr(Ⅲ)][HA]_I[H₂A₂]。)/(k_-1[H⁺]+k₂[H₂A₂]。)(1/β₁β₂)(H⁺]²+1/β₂[H⁺]+1+a/β₁β₂[H⁺][SO₄^2-])-(k_-1k_-2[CrA₃]。[H⁺]/(k_-1[H⁺]+k₂[H₂A₂]。))
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