Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study

Milosavljević, Milan; Marinković, Aleksandar D.; Veljković, Vlada B.; Milenković, Dragan

doi:10.1007/s00706-011-0596-1

Cited by 2 publications

(1 citation statement)

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“…However, because an evident disadvantage of xanthates is their poor selectivity, thionocarbamates are considered more effective collectors for sulfide ores; they also have good selectivity, low dosage and toxicity and are extensively applied worldwide [3,4]. As a result, the preparation, modification and performance of thionocarbamates have gained increasing attention since their use in mineral flotation [5][6][7][8][9]. Glembotskii [10] reported that the collecting ability of thionocarbamate is directly influenced by the electron density of the reactive center (sulfur atom) such that it is enhanced when the electron density of the reactive center is raised by the electron-donating group.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Ether Thionocarbamates and Study on Their Flotation Performance for Chalcopyrite

et al. 2016

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Novel ether thionocarbamates, O-butoxy isopropyl-N-ethoxycarbonyl thionocarbamate (BIPECTC) and O-(2-butoxy-1-methylethoxy) isopropyl-N-ethoxycarbonyl thionocarbamate (BMIPECTC), were synthesized in this study. Their collecting efficiencies in the flotation of chalcopyrite were investigated using flotation tests, adsorption measurements, ultraviolet spectra (UV) and Fourier transform-infrared spectroscopy (FT-IR) and density functional theory (DFT) calculations. The synthesized ether thionocarbamates showed better frothing properties than methyl-isobutyl-carbinol (MIBC) and stronger affinity to chalcopyrite compared with O-isopropyl-N-ethyl thionocarbamate (IPETC) and O-isobutyl-N-ethoxycarbonyl thionocarbamate (IBECTC). UV spectra analysis showed that the ether thionocarbamates react with Cu 2+ , with the exception of Fe 2+ , Ni 2+ , Zn 2+ and Pb 2+ . Additionally, it was further confirmed by FTIR spectra that a chemical reaction occurs between copper ion and BIPECTC and BMIPECTC. The adsorption capacity measurements revealed that chalcopyrite exhibits good adsorption ability for ether thionocarbamates at an approximate pH of 8-10, which agrees with the flotation tests. The quantum chemistry calculation results indicated that the ether thionocarbamates exhibit stronger collecting ability for copper mineral in terms of frontier molecular orbital analysis, binding model simulation with copper ions and the molecular hydrophobicity compared with IPETC and IBECTC. The computational results are in very good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%