scholarly journals Kinetic study on nicotinium dichromate oxidation of para-substituted acetophenones and evaluation of thermodynamic parameters

2021 ◽  
Vol 10 (4) ◽  
Keyword(s):  
Kinetic Study ◽  
Thermodynamic Parameters

Efficient anionic dye adsorption on natural untreated clay: Kinetic study and thermodynamic parameters

Desalination ◽  
2011 ◽  
Vol 275 (1-3) ◽  
pp. 74-81 ◽  
Author(s):  
Emna Errais ◽  
Joelle Duplay ◽  
Fadila Darragi ◽  
Inès M'Rabet ◽  
Amélie Aubert ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Thermodynamic Parameters ◽  
Dye Adsorption ◽  
Anionic Dye

Tautomerism of 5-nitro-2-furylnitromethane

1981 ◽  
Vol 46 (12) ◽  
pp. 3122-3127
Author(s):  
Iva Sroková ◽  
Pavel Vetešník ◽  
Adolf Jurášek ◽  
Jaroslav Kováč
Keyword(s):  
Kinetic Study ◽  
Temperature Dependence ◽  
Thermodynamic Parameters ◽  
Rate Constants ◽  
Strong Acid ◽  
Ion Pair ◽  
Aprotic Solvents ◽  
Protic Solvents ◽  
Parallel Reactions ◽  
Experimental Values

UV study of properties of 5-nitro-2-furylnitromethane (I) in various solvents has shown that this compound is a very strong acid (pKa 3.98) forming an ion pair in protic solvents (water, alcohols) and existing exclusively as nitro-form in aprotic solvents (tetrachloromethane, chloroform, n-hexane, diethyl ether, dioxane). Kinetic study of tautomerism in water has given experimental values of combined rate constants of parallel reactions. Thermodynamic parameters of the tautomeric transformations have been calculated from temperature dependence of the rate constants.

Potential of macauba endocarp (Acrocomia aculeate) for bioenergy production: Multi-component kinetic study and estimation of thermodynamic parameters of activation

2021 ◽  
pp. 179134
Author(s):  
José Luiz Francisco Alves ◽  
Jean Constantino Gomes da Silva ◽  
Guilherme Davi Mumbach ◽  
Ricardo Francisco Alves ◽  
Rennio Felix de Sena ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Thermodynamic Parameters ◽  
Bioenergy Production

Chalcones as Analytical Reagents of Aluminum: Stability, Thermodynamic and Kinetic Study

2015 ◽  
Vol 229 (3) ◽  
Author(s):  
Vanesa A. Muñoz ◽  
Carolina G. Kretek ◽  
M. Paulina Montaña ◽  
Nora  B. Pappano ◽  
Nora  B. Debattista ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Thermodynamic Parameters ◽  
Stability Constants ◽  
Driving Force ◽  
Biological Properties ◽  
Polyphenolic Compounds ◽  
Formation Reaction ◽  
Long Time ◽  
Analytical Reagents ◽  
The Stability

AbstractChalcones, a group of polyphenolic compounds, has been studied for a long time due to their biological properties and their ability as analytical reagents. In this work the stability and thermodynamic parameters concerning the fotmation in ethanolic medium of two chalcone–aluminium complexes (2′,3-dihydroxychalcone-Al(III) and 2′,4′,3-trihydroxychalcone-Al(III)) were studied and a kinetic study of the formation reaction was aslo performed. Both systems showed 1:1 L : M stoichiometry and stability constants at four temperatures were determined. Thermodynamic parameters indicate that both formation reactions are endothermic and driving force is entropic. Kinetic study revealed that 2′,4′,3-trihydroxychalcone-Al(III) formation is faster than 2′,3-dihydroxyclacone-Al(III), a factor which can be interesting when proposing new analytical reagents.

Kinetic and Thermodynamic Study of the Acid-Catalysed Hydrolysis of Diethylmalonate in Dioxane-Water Mixtures

1984 ◽  
Vol 39 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Adel N. Asaad ◽  
Fayez Y. Khalil
Keyword(s):  
Kinetic Study ◽  
Acid Hydrolysis ◽  
Thermodynamic Parameters ◽  
Reaction Rate ◽  
Organic Content ◽  
Solvent Composition ◽  
Molecular Dipole ◽  
Selectivity Principle ◽  
Hydrolysis Of ◽  
Kinetic And Thermodynamic Study

A kinetic study of the acid-hydrolysis of diethylmalonate in water and dioxane-water mixtures covering the range 0-95% (w/w) of dioxane is reported. The reaction rate is inversely proportional to the organic content of the medium up to about 80% (w/w) then, after passing through a minimum, it becomes directly proportional as the dioxane cosolvent is further added. The kinetic ratio k1/k2 is independent of the solvent composition. The observed activation energies, thermodynamic parameters and radii of the activated complexes along the whole range of solvent composition, for the two consecutive steps of the reaction, are computed. Electrostatic theories favour an interaction in which an ion and a molecular dipole are involved. Application of the reactivity-selectivity principle (RSP) to the present reaction in comparison with that for diethylsuccinate. under different conditions of temperature and solvent composition, is presented.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

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