Extraction of chromium(VI) from sulphuric acid solutions by means of tri-n-octylamine

Deptula, C.

doi:10.1016/0022-1902(68)80560-3

Cited by 24 publications

(9 citation statements)

References 11 publications

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“…Table 5 reports the parameters obtained from the fitting of experimental data to the rearranged equilibrium expressions. The equilibrium parameter of the reaction given by Eqn (16) can be calculated through Eqn (25) using the values of the equilibrium parameters of reactions (21) and (22) and obtaining a value of K 16 = 1.46, which is very close to K 16 = 1.52, a value that was obtained previously from the fitting of the experimental data to the stoichiometric reaction given by Eqn (16).…”

Section: Tertiary System: Chromium Sulfate and Chloride Anions In Sumentioning

confidence: 98%

“…HCr 2 O 7 − , Cr 2 O 7 2− and HCrO 4 − . 25,33,34 In the studied range of chromium concentration and pH, chromium is mainly present as hydrogen chromate (HCrO 4 − ) and dichromate (Cr 2 O 7 2− ) while the presence of other chromium species can be considered negligible. For this reason, the extraction reactions for both species were taken into account.…”

Section: Tertiary System: Chromium Sulfate and Chloride Anions In Sumentioning

confidence: 99%

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Removal of anionic pollutants from groundwaters using Alamine 336: chemical equilibrium modelling

Bringas

Román

Ortiz

2006

J of Chemical Tech & Biotech

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Section: Tertiary System: Chromium Sulfate and Chloride Anions In Sumentioning

confidence: 98%

Section: Tertiary System: Chromium Sulfate and Chloride Anions In Sumentioning

confidence: 99%

Removal of anionic pollutants from groundwaters using Alamine 336: chemical equilibrium modelling

Bringas

Román

Ortiz

2006

J of Chemical Tech & Biotech

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“…The extraction of HCr 2 O 7 -anion as complex ion pair has been reported in similar extraction systems in which chromium is extracted from highly acidic solutions 11,15,20 . …”

Section: Distribution Isotherm and Stoichiometrymentioning

confidence: 99%

Extraction and Transport of Chromium(VI) Through a Bulk Liquid Membrane Containing Triphenylphosphine

Sahmoune

Mitiche

2004

Annali di Chimica

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The solvent extraction of chromium(VI) in chloroform, dichloromethane, dichloroethane and its transport through a chloroformic bulk liquid membrane from sulphuric acid solutions with the neutral extractant triphenylphosphine (TPP) were studied. It was highlighted that the TPP extractant is an interesting complexing and efficient carrier for transport of chromium(VI) as [(HTPP)HCr2O7] complex from a 2M sulphuric acid solutions. It has a high ability to concentrate the chromium(VI) in the receiving phase according to the Donnan equilibrium. The co-extraction and the co-transport of sulphuric acid is very low and has no effect on the transport efficiency. The transport rate depends mainly on the initial concentration of the extractant.

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“…Sengupta et al studied the extraction of Cr(VI) by tri-n-octylamine (TOA) from different inorganic acids solutions. The extracted species is HCrO À 4 from HCl solution and Cr 2 O 2À 7 or HCr 2 O À 7 from sulfuric acid solution [16,17]. Lo and Shiue [12] investigated the extraction of chromium(VI) from aqueous solutions of 0.1 M ionic strength by Aliquat 336 in a mixture of kerosene and xylene.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of chromium(VI) from hydrochloric acid solution with trialkylamine/kerosene

Cui

Ren

et al. 2015

Desalination and Water Treatment

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The extraction equilibrium of Cr(VI) with trialkylamine (N235, R 3 N, R = C 8 -C 10 ) using kerosene as the diluent was investigated. The influence of various analytical parameters such as pH, equilibrium time, temperature, extractants, and diluents was systematically evaluated. The structure of organic solution was identified by Fourier transform infrared spectroscopy (FTIR). The results indicated that 99.99% Cr(VI) was extracted by N235 in kerosene under the optimum separation conditions. Results also observed that the relative affinities of different anions to N235 were in the order of NO À 3 < PO 3À 4 < SO 2À 4 < Cl − . Thermodynamic functions revealed that the extraction process was exothermic in nature, and the enthalpy (ΔH) associated with the extraction process was calculated to be −35.95 kJ mol −1 at 298 K. Slope method analysis showed that the log D vs. log [N235] plots were straight lines with slope nearly 3.0 with kerosene, n-heptane, and n-dodecane as the diluents, but mole method analysis indicated that the molar ratio between N235 and hexavalent chromium ion in the extracted complex was identified to be 1. The loaded organic solvent was regenerated with NaOH, NaNO 3 , NaHCO 3 , and N 2 H 4 · H 2 SO 4 . The regenerated solvent could be reused in succeeding extraction of chromium(VI). FTIR confirmed that the structure of the loading organic solution can be destroyed in light.

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Extraction of chromium(VI) from sulphuric acid solutions by means of tri-n-octylamine

Cited by 24 publications

References 11 publications

Removal of anionic pollutants from groundwaters using Alamine 336: chemical equilibrium modelling

Removal of anionic pollutants from groundwaters using Alamine 336: chemical equilibrium modelling

Extraction and Transport of Chromium(VI) Through a Bulk Liquid Membrane Containing Triphenylphosphine

Solvent extraction of chromium(VI) from hydrochloric acid solution with trialkylamine/kerosene

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