Effect of temperature on the reaction of alkenes with diazoacetic ester in the presence of copper sulfate

A. P. Meshcheryakov; I. E. Dolgii

doi:10.1007/bf00906583

Reaction of olefins with diazoacetic ester in presence of a copper sulfate catalyst

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science ◽

10.1007/bf01179189 ◽

1960 ◽

Vol 9 (5) ◽

pp. 864-867 ◽

Cited By ~ 1

Author(s):

A. P. Meshcheryakov ◽

I. E. Dolgii

Keyword(s):

Copper Sulfate ◽

Diazoacetic Ester

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Unusual reaction of alkenylfurans with diazoacetic ester in the presence of copper sulfate

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science ◽

10.1007/bf00857433 ◽

1971 ◽

Vol 20 (7) ◽

pp. 1496-1496

Author(s):

O. M. Nefedov ◽

V. M. Shostakovskii ◽

M. Ya. Samoilova ◽

M. I. Kravchenko

Keyword(s):

Copper Sulfate ◽

Unusual Reaction ◽

Diazoacetic Ester

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The Effect of Temperature on the Molluscacidal Activity of Copper Sulfate

Science ◽

10.1126/science.114.2968.521 ◽

1951 ◽

Vol 114 (2968) ◽

pp. 521-523 ◽

Cited By ~ 7

Author(s):

D. O. Hoffman ◽

R. Zakhary

Keyword(s):

Copper Sulfate ◽

Effect Of Temperature

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Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution

Metals ◽

10.3390/met10010007 ◽

2019 ◽

Vol 10 (1) ◽

pp. 7

Author(s):

Kirill A. Karimov ◽

Denis A. Rogozhnikov ◽

Evgeniy A. Kuzas ◽

Andrei A. Shoppert

Keyword(s):

Copper Sulfate ◽

Raw Materials ◽

Sulfate Solution ◽

Effect Of Temperature ◽

Arsenic Sulfide ◽

Copper Sulfate Solution ◽

X Ray ◽

Shrinking Core ◽

Multicomponent Solutions ◽

Kinetics Of

The overall decrease in the quality of mineral raw materials, combined with the use of arsenic-containing ores, results in large amounts of various intermediate products containing this highly toxic element. The use of hydrometallurgical technologies for these materials is complicated by the formation of multicomponent solutions and the difficulty of separating copper from arsenic. Previously, for the selective separation of As from copper–arsenic intermediates a leaching method in the presence of Cu(II) ions was proposed. This paper describes the investigation of the kinetics of arsenic sulfide-containing materials leaching by copper sulfate solution. The cakes after leaching of arsenic trisulfide with a solution of copper sulfate were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDS). The effect of temperature (70–90 °C), the initial concentration of CuSO4 (0.23–0.28 M) and the time on the As recovery into the solution was studied. The process temperature has the greatest effect on the kinetics, while an increase in copper concentration from 0.23 to 0.28 M effects an increase in As transfer into solution from 93.2% to 97.8% for 120 min of leaching. However, the shrinking core model that best fits the kinetic data suggests that the process occurs by the intra-diffusion mode with the average activation energy of 44.9 kJ/mol. Using the time-to-a-given-fraction kinetics analysis, it was determined that the leaching mechanism does not change during the reaction. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X) − 1/3 − 1] = 4560000Cu3.61e−44900/RT t.

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Nucleation of Disorder in Fe3Al Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100061574 ◽

1967 ◽

Vol 25 ◽

pp. 312-313

Author(s):

P. R. Swann ◽

W. R. Duff ◽

R. M. Fisher

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Annealing Temperature ◽

Antiphase Domain ◽

Effect Of Temperature ◽

Domain Structures ◽

Transmission Electron ◽

Domain Boundaries ◽

Higher Temperature ◽

The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

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The effect of temperature on high-resolution TEM image contrast

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139573 ◽

1995 ◽

Vol 53 ◽

pp. 640-641

Author(s):

T. Geipel ◽

W. Mader ◽

P. Pirouz

Keyword(s):

Form Factor ◽

Inelastic Scattering ◽

Accurate Method ◽

Waller Factor ◽

Effect Of Temperature ◽

Specimen Thickness ◽

Influence Of Temperature ◽

Debye Waller Factor ◽

Influence Of Temperature On ◽

Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

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