Study on Autocatalytic Decomposition of Dimethyl Sulfoxide (DMSO) II: Analysis of Intermediate Substances Obtained in the Induction Period and Investigations Regarding Formic Acid

2021 ◽  
Author(s):  
Yoshikuni Deguchi ◽  
Masafumi Kono ◽  
Yuto Koizumi ◽  
Yukino Watanabe ◽  
Michiya Fujita ◽  
...  
Keyword(s):  
Formic Acid ◽  
Induction Period ◽  
Dimethyl Sulfoxide ◽  
Autocatalytic Decomposition

THE KINETICS OF THE OXIDATION OF GASEOUS ACETALDEHYDE

1932 ◽  
Vol 7 (2) ◽  
pp. 149-161 ◽  
Author(s):  
W. H. Hatcher ◽  
E. W. R. Steacie ◽  
Frances Howland
Keyword(s):  
Carbon Dioxide ◽  
Formic Acid ◽  
Induction Period ◽  
Reaction Vessel ◽  
Oxidation Products ◽  
Main Reaction ◽  
Chain Mechanism ◽  
Subsequent Reaction ◽  
A Chain ◽  
Kinetics Of

The kinetics of the oxidation of gaseous acetaldehyde have been investigated from 60° to 120 °C. by observing the rate of pressure decrease in a system at constant volume. A considerable induction period exists, during which the main products of the reaction are carbon dioxide, water, and formic acid. The main reaction in the subsequent stages involves the formation of peroxides and their oxidation products. The heat of activation of the reaction is 8700 calories per gram molecule. The indications are that the reactions occurring during the induction period are heterogeneous. The subsequent reaction occurs by a chain mechanism. The chains are initiated at the walls of the reaction vessel, and are also largely broken at the walls.

Shelf-life prediction from induction period calorimetric measurements on materials undergoing autocatalytic decomposition

1990 ◽  
Vol 68 (11) ◽  
pp. 2111-2114 ◽  
Author(s):  
Lee D. Hansen ◽  
Delbert J. Eatough ◽  
Edwin A. Lewis ◽  
Robert G. Bergstrom ◽  
Damaris Degraft-Johnson ◽  
...  
Keyword(s):  
Shelf Life ◽  
Induction Period ◽  
Heat Generation ◽  
Life Prediction ◽  
Autocatalytic Reaction ◽  
Calorimetric Measurement ◽  
Autocatalytic Decomposition ◽  
Calorimetric Measurements ◽  
Shelf Life Prediction ◽  
Degradation Reaction

The shelf- or use-life of a material which decomposes by an autocatalytic reaction is shown to be inversely proportional to the rate of heat generation during the induction period of the degradation reaction. Calorimetric measurement of the rate of heat generation during the induction period takes only a few hours. It can often be done at or very near the actual storage or use temperature of the material. Measurements on Lovastatin (2-methylbutanoic acid 1,2,3,7,8,8a-hexahydro-3,7-dimethyl-8-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1-naphthalenylester) are used as an example of this application. Keywords: autocatalytic, calorimetry, oxidation, decomposition, Lovastatin, Mevacor.

scholarly journals Comparative studies of the slow combustion of methane, methyl alcohol, formaldehyde, and formic acid

1936 ◽  
Vol 154 (882) ◽  
pp. 297-328 ◽  
Keyword(s):  
Formic Acid ◽  
Induction Period ◽  
Comparative Studies ◽  
Volume Ratio ◽  
Reaction Vessel ◽  
Hydrocarbon Combustion ◽  
Slow Combustion ◽  
Temperature And Pressure ◽  
Gaseous Hydrocarbons ◽  
Oxygen Ratio

Although the occurrence of a well-defined “induction period” in the slow combustion of gaseous hydrocarbons is now well-established, and something is known about the variation of its duration with such factors as temperature, pressure, mixture-composition, and surface/volume ratio, we are still much in the dark as to its real significance in relation to the mechanism of hydrocarbon-combustion. It has been found that sometimes the induction period may be lengthened by increasing the surface/volume ratio of the reaction vessel, that it may be shortened by raising the temperature or increasing the pressure of the reacting medium, and that for any particular hydrocarbon its duration at a given temperature and pressure depends on the hydrocarbon-oxygen ratio, being always shortest with a 2: 1, i. e ., the alcohol-forming, ratio as was shown in Table III of the Bakerian Lecture of 1932 ( q. v .).

A Highly Durable, Self-Photosensitized Mononuclear Ruthenium Catalyst for CO2 Reduction

Synlett ◽  
2021 ◽  
Author(s):  
Kenji Kamada ◽  
Hiroko Okuwa ◽  
Taku Wakabayashi ◽  
Keita Sekizawa ◽  
Shunsuke Sato ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Reaction Time ◽  
Formic Acid ◽  
Induction Period ◽  
Isotope Labeling ◽  
Co2 Reduction ◽  
Tetradentate Ligand ◽  
Ru Complex ◽  
Carbon Dioxide Co2

A novel mononuclear ruthenium (Ru) complex bearing a PNNP-type tetradentate ligand is introduced here as a self-photosensitized catalyst for the reduction of carbon dioxide (CO2). When the pre-activation of the Ru complex by reaction with a base was carried out, an induction period of catalyst almost disappeared and the catalyst turnover numbers (TONs) over a reaction time of 144 h reached 307 and 489 for carbon monoxide (CO) and for formic acid (HCO2H), respectively. The complex has a long lifespan as a dual photosensitizer and reduction catalyst, due to the sterically bulky and structurally robust (PNNP)Ru framework. Isotope labeling experiments under 13CO2 atmosphere indicate that CO and HCO2H were both produced from CO2.

Study on Autocatalytic Decomposition of Dimethyl Sulfoxide (DMSO) III: Investigations Regarding the Main Decomposition

2021 ◽  
Author(s):  
Yoshikuni Deguchi ◽  
Masafumi Kono ◽  
Yuto Koizumi ◽  
Yukino Watanabe ◽  
Michiya Fujita ◽  
...  
Keyword(s):  
Dimethyl Sulfoxide ◽  
Autocatalytic Decomposition ◽  
Main Decomposition

Study on Autocatalytic Decomposition of Dimethyl Sulfoxide (DMSO)

2020 ◽  
Vol 24 (9) ◽  
pp. 1614-1620 ◽  
Author(s):  
Yoshikuni Deguchi ◽  
Masafumi Kono ◽  
Yuto Koizumi ◽  
Yu-ichiro Izato ◽  
Atsumi Miyake
Keyword(s):  
Dimethyl Sulfoxide ◽  
Autocatalytic Decomposition

scholarly journals Starch Formates: Synthesis and Modification

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4882
Author(s):  
Sascha Blohm ◽  
Thomas Heinze ◽  
Haisong Qi
Keyword(s):  
Fatty Acids ◽  
Formic Acid ◽  
Dimethyl Sulfoxide ◽  
Aprotic Solvents ◽  
Long Chain Fatty Acids ◽  
Melting Temperatures ◽  
Long Chain ◽  
Chain Fatty Acids

Starch can be efficiently converted into the corresponding formates homogeneously using N-formyl imidazole obtained by the reaction of 1,1′-carbonyldiimidazole and formic acid in dimethyl sulfoxide as a solvent. Starch formates are soluble in polar aprotic solvents, not susceptible against hydrolysis, and not meltable. Thermoplastics could be generated by conversion of starch formates with long-chain fatty acids exemplified by the conversion with lauroyl chloride in N,N-dimethylacetamide, leading to mixed starch laurate formates. The mixed esters show melting temperatures mainly dependent on the amount of laurate ester moieties.

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