Kinetics of formation of ethylene oxide hydrate. Part II. Incongruent solutions and discussion

1968 ◽  
Vol 46 (24) ◽  
pp. 3867-3877 ◽  
Author(s):  
D. N. Glew ◽  
M. L. Haggett
Keyword(s):  
Heat Conduction ◽  
Ethylene Oxide ◽  
Oxide Hydrate ◽  
Early Stages ◽  
Kinetics Of Formation ◽  
Kinetics Of

Equations were developed to describe the experimental rates of formation of ethylene oxide hydrate from stirred, incongruent solutions. Heat conduction through the walls of the dilatometer bulb was rate-controlling. Results for congruent solutions were consistent with these equations during the early stages of hydrate growth.

Kinetics of formation of ethylene oxide hydrate. Part I. Experimental method and congruent solutions

1968 ◽  
Vol 46 (24) ◽  
pp. 3857-3865 ◽  
Author(s):  
D. N. Glew ◽  
M. L. Haggett
Keyword(s):  
Heat Transfer ◽  
Ethylene Oxide ◽  
Experimental Method ◽  
Hydrate Formation ◽  
Controlling Factor ◽  
Oxide Hydrate ◽  
Mechanical Stirring ◽  
Magnetic Stirring ◽  
Kinetics Of Formation ◽  
Kinetics Of

A dilatometer was constructed for studying the formation of ethylene oxide hydrate. In unstirred, congruent solutions heat transfer appeared to be the significant rate-controlling factor. Initial hydrate formation rates were independent of stirring at speeds greater than approximately 100 r.p.m. Magnetic stirring was inadequate due to hydrate build-up on the walls of the dilatometer bulb. Mechanical stirring eliminated this build-up and gave satisfactory results.

Kinetics of cyclization of S-ethoxycarbonylmethylisothiouronium chloride to 2-imino-4-thiazolidone

1979 ◽  
Vol 44 (3) ◽  
pp. 912-917 ◽  
Author(s):  
Vladimír Macháček ◽  
Said A. El-bahai ◽  
Vojeslav Štěrba
Keyword(s):  
Hydrochloric Acid ◽  
Dilute Hydrochloric Acid ◽  
Base Catalysis ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Rate Limiting ◽  
Kinetics Of

Kinetics of formation of 2-imino-4-thiazolidone from S-ethoxycarbonylmethylisothiouronium chloride has been studied in aqueous buffers and dilute hydrochloric acid. The reaction is subject to general base catalysis, the β value being 0.65. Its rate limiting step consists in acid-catalyzed splitting off of ethoxide ion from dipolar tetrahedral intermediate. At pH < 2 formation of this intermediate becomes rate-limiting; rate constant of its formation is 2 . 104 s-1.

Cyclization and acid-catalyzed hydrolysis of O-benzoylbenzamidoximes

1986 ◽  
Vol 51 (12) ◽  
pp. 2786-2797
Author(s):  
František Grambal ◽  
Jan Lasovský
Keyword(s):  
Reaction Rate ◽  
Kinetic Isotope ◽  
Acid Base Equilibrium ◽  
Mineral Acids ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Ph Scale ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

Kinetics of formation of 1,2,4-oxadiazoles from 24 substitution derivatives of O-benzoylbenzamidoxime have been studied in sulphuric acid and aqueous ethanol media. It has been found that this medium requires introduction of the Hammett H0 function instead of the pH scale beginning as low as from 0.1% solutions of mineral acids. Effects of the acid concentration, ionic strength, and temperature on the reaction rate and on the kinetic isotope effect have been followed. From these dependences and from polar effects of substituents it was concluded that along with the cyclization to 1,2,4-oxadiazoles there proceeds hydrolysis to benzamidoxime and benzoic acid. The reaction is thermodynamically controlled by the acid-base equilibrium of the O-benzylated benzamidoximes.

THE KINETICS OF THE THERMAL REACTIONS OF ETHYLENE OXIDE

1963 ◽  
Vol 41 (12) ◽  
pp. 2956-2961 ◽  
Author(s):  
M. Lynne Neufeld ◽  
Arthur T. Blades
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Ethylene Oxide ◽  
Thermal Reactions ◽  
Kinetics Of

The thermal reactions of ethylene oxide in the presence of an excess of propylene have been studied as a function of pressure and it has been found that there are two sets of products, acetaldehyde and free radicals, presumably methyl and formyl. These products are believed to arise from an excited acetaldehyde intermediate. Some evidence has been obtained for the occurrence of a surface-catalyzed rearrangement to acetaldehyde but the free radical products are uninfluenced by surface.

Effect of CTABr (surfactant) on the kinetics of formation of silver nanoparticles by Amla extract

2021 ◽  
Vol 329 ◽  
pp. 115537
Author(s):  
Nazia Iqbal ◽  
S.M. Shakeel Iqubal ◽  
Aejaz Abdullatif Khan ◽  
Tasneem Mohammed ◽  
Ali Mohamed Alshabi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Kinetics Of Formation ◽  
Kinetics Of
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