Temperature dependence of alkaline-hydrolysis reactions of phenyl dimethylphosphinothionates and acetates in mixtures of water with tetrahydrofuran

1984 ◽  
Vol 33 (8) ◽  
pp. 1576-1578 ◽  
Author(s):  
E. L. Zhdankovich ◽  
V. A. Baranskii ◽  
G. D. Eliseeva ◽  
M. G. Voronkov
Keyword(s):  
Temperature Dependence ◽  
Alkaline Hydrolysis ◽  
Hydrolysis Reactions

KINETICS OF THE AQUEOUS ALKALINE HOMOGENOUS HYDROLYSIS OF HIGH EXPLOSIVE 1, 3,5,7-TETRAAZA- 1, 3,5,7-TETRANITROCYCLOOCTANE (HMX)

1994 ◽  
Vol 30 (3) ◽  
pp. 53-61 ◽  
Author(s):  
Harro M. Heilmann ◽  
Michael K. Stenstrom ◽  
Rolf P. X. Hesselmann ◽  
Udo Wiesmann
Keyword(s):  
Temperature Dependence ◽  
Alkaline Hydrolysis ◽  
Rate Constants ◽  
Elevated Temperatures ◽  
Second Order ◽  
Order Rate ◽  
Subsequent Calculation ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Order Rate Equation

In order to get basic data for the design of a novel treatment scheme for high explosives we investigated the kinetics for the aqueous alkaline hydrolysis of 1,3,5,7-tetraaza-1,3,5,7-tetranitrocyclooctane (HMX) and the temperature dependence of the rate constants. We used an HPLC procedure for the analysis of HMX. All experimental data could be fit accurately to a pseudo first-order rate equation and subsequent calculation of second-order rate constants was also precise. Temperature dependence could be modeled with the Arrhenius equation. An increase of 10°C led to an average increase in the second-order rate constants by the 3.16 fold. The activation energy of the second-order reaction was determined to be 111.9 ±0.76 kJ·moJ‒1. We found the alkaline hydrolysis to be rapid (less than 2.5% of the initial HMX-concentration left after 100 minutes) at base concentrations of 23 mmol oH‒/L and elevated temperatures between 60 and 80°C.

scholarly journals Humic Acids Aggregates as Microheterogeneus Reaction Media: Alkaline Hydrolysis Reactions

2021 ◽  
Author(s):  
Antonio Cid ◽  
L. García-Río ◽  
Juan C. Mejuto ◽  
A. Saavedra
Keyword(s):  
Humic Acids ◽  
Chemical Stability ◽  
Alkaline Hydrolysis ◽  
Water Solution ◽  
Kinetic Behavior ◽  
Pseudophase Model ◽  
Reaction Media ◽  
Hydrolysis Reactions

The influence of humic aggregates in water solution upon the chemical stability under basic conditions of different substrates has been reviewed. The kinetic behavior of each substrate has been modelized in terms of micellar pseudophase model.

The Temperature Dependence of Transition State Volumes in Hydrolysis Reactions

1971 ◽  
Vol 49 (23) ◽  
pp. 3840-3845 ◽  
Author(s):  
Moyra J. Mackinnon ◽  
J. B. Hyne
Keyword(s):  
Transition State ◽  
Temperature Dependence ◽  
Rate Data ◽  
Partial Volume ◽  
Solvation Effects ◽  
Volume Formula ◽  
Hydrolysis Reactions

The temperature dependence of the transition state volume, [Formula: see text], in a number of hydrolysis reactions is derived from pressure/rate data and partial volume temperature dependence. The values obtained for [Formula: see text] vary from near zero for p-methylbenzyl chloride to about 0.3 ml mol−1 deg−1 for isopropyl bromide. The interpretation of the experimental and derived values for these hydrolyses is discussed in terms of charge development with accompanying solvation effects about the solute.

Stereochemical features of diterpene alkaloids in acylation and alkaline hydrolysis reactions

1975 ◽  
Vol 11 (3) ◽  
pp. 392-394
Author(s):  
M. N. Sultankhodzhaev ◽  
M. S. Yunusov ◽  
S. Yu. Yunusov
Keyword(s):  
Alkaline Hydrolysis ◽  
Diterpene Alkaloids ◽  
Hydrolysis Reactions

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

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