The Chemistry Of Chromyl Compounds

Hartford, Winslow H.; Darrin, Marc

doi:10.1021/cr50019a001

Cited by 82 publications

(25 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the oxidation of the extraction solvent was investigated by following the evolution of Cr(III) concentration in the aqueous phase by UV-visible spectroscopy at 417 and 587 nm [10].…”

Section: Methods and Equipmentsmentioning

confidence: 99%

“…The intensity of this peak decreased over time. Figure 2b shows a peak located at 587 nm in the spectrum of the aqueous phase corresponding to Cr(III) [10]. The intensity of this peak increased over time.…”

Section: Equilibria Thermodynamic Constants At 25 °Cmentioning

confidence: 97%

“…Figure 2a shows a peak located at 417 nm in the spectrum of the organic phase attributed to Cr(VI) extracted by tri-n-octylamine [10]. The intensity of this peak decreased over time.…”

Section: Equilibria Thermodynamic Constants At 25 °Cmentioning

confidence: 99%

“…Cr(VI) is also present in the feed solution treated by the solvent extraction process implemented in the Niger plant for uranium production, and this metal species is also known to be a strong oxidant that can oxidize organic molecules such as alcohols, aldehydes or ketones [9][10][11][12][13]. Therefore, it is also of great interest to investigate the oxidation properties of Cr(VI) towards the extraction solvent used in the Niger plant, namely tri-n-octylamine in n-dodecane modified with 1-tridecanol.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Chemical Degradation of a Mixture of tri-n-Octylamine and 1-Tridecanol in the Presence of Chromium(VI) in Acidic Sulfate Media

Chagnes

Cote

2018

Metals

View full text Add to dashboard Cite

Abstract:The chemical degradation of an extraction solvent composed of a mixture of tri-n-octylamine (extractant) and 1-tridecanol (phase modifier) in n-dodecane in contact with an acidic aqueous sulfate solution containing chromium(VI) has been investigated. The kinetics of degradation and the degradation products have been determined. GC-MS analyses evidenced the formation of 1-tridecanal, di-n-octylamine, N,N,N-octen-1-yl-dioctylamine, and an unidentified degradation compound, which may have contained a double bond and a carboxylic acid function. The mechanisms of degradation have been discussed on the basis of these identified degradation compounds. The study of the degradation kinetics showed that an increase of tri-n-octylamine concentration in the organic phase is responsible for a decrease of the degradation rate, while an increase in sulfuric acid concentration in the aqueous phase leads to a strong increase in the degradation rate.

show abstract

Section: Methods and Equipmentsmentioning

confidence: 99%

Section: Equilibria Thermodynamic Constants At 25 °Cmentioning

confidence: 97%

“…Figure 2a shows a peak located at 417 nm in the spectrum of the organic phase attributed to Cr(VI) extracted by tri-n-octylamine [10]. The intensity of this peak decreased over time.…”

Section: Equilibria Thermodynamic Constants At 25 °Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemical Degradation of a Mixture of tri-n-Octylamine and 1-Tridecanol in the Presence of Chromium(VI) in Acidic Sulfate Media

Chagnes

Cote

2018

Metals

View full text Add to dashboard Cite

show abstract

“…Chromyl chloride, CrO,Cl,, has been used as an oxidant for hydrocarbons from time to time for many years, and its reactions with saturated and unsaturated molecules have been extensively studied (1)(2)(3)(4)(5)(6)(7)(8). In the course of recent investigations of the structure of the main product of the Etard reaction of chromyl chloride with toluene (9), it was found that this product could react with two molecules of a Lewis base to form complexes containing the elements of the hydrocarbon, chromyl chloride, and the base, in the approximate molar proportions 1 :2:2.…”

Section: Introductionmentioning

confidence: 99%

Reaction of chromyl chloride with donor molecules

Makhija¹,

Stairs²

1969

Can. J. Chem.

View full text Add to dashboard Cite

Reaction of chromyl chloride with various donor molecules led to solid products of compositions CrO2Cl2.2D (D = acetone or dimethylsulfoxide), 2CrO2Cl2.3D (D = tetrahydrofuran, 1,4-dioxan, or 4-picoline), CrO2Cl2.D (D = diethyl ether, triphenylphosphine, or triphenylarsine), and 2CrO2Cl2.(C6H5)3N. Acetonitrile failed to react. Infrared and ultraviolet spectra, X-ray diffraction and magnetic measurements, and the organic products obtained on hydrolysis were interpreted as showing that none of these complexes are Lewis adducts of chromyl chloride, but that all contain chromium(IV).

show abstract

Chromium Compounds

Page¹,

Loar²

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Chromium compounds and their important uses are described. Chemical properties of the low valence compounds, Cr(‐II) through Cr(I), and those of Cr(IV) and Cr(V) are discussed as are those of the commercially important oxidation states of Cr(II), Cr(III), and Cr(VI). Sodium chromate and dichromate production from imported chromite ore, and the production of other chromates, dichromates, and chromic acid are summarized. The manufacture of water‐soluble trivalent compounds is also given. Regulations concerning shipments, specifications, and analytical test methods are discussed as are the health and safety factors of chromium compounds. The environmental impact and waste management practices of chromium compounds is also of importance. Chromium compounds of various oxidation states are used commercially as pigments, in metal finishing, leather tanning, drilling muds, and in wood preservation. Chromium compounds are also used in alloys, batteries catalists, photosensitive gels, and as reagent grade chemicals.

show abstract

The Chemistry Of Chromyl Compounds

Cited by 82 publications

References 93 publications

Chemical Degradation of a Mixture of tri-n-Octylamine and 1-Tridecanol in the Presence of Chromium(VI) in Acidic Sulfate Media

Chemical Degradation of a Mixture of tri-n-Octylamine and 1-Tridecanol in the Presence of Chromium(VI) in Acidic Sulfate Media

Reaction of chromyl chloride with donor molecules

Chromium Compounds

Contact Info

Product

Resources

About