Kinetic study of the thermal decomposition of 1,1-diphenylpropyl hydrogen phthalate ester in solution

1973 ◽  
Vol 38 (6) ◽  
pp. 1186-1190 ◽  
Author(s):  
Raphael M. Ottenbrite ◽  
James W. Brockington ◽  
Kenneth G. Rutherford
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Phthalate Ester ◽  
Hydrogen Phthalate

Low-temperature pyrolysis. II. An isotope study of the pyrolysis of the hydrogen phthalate ester of trans-1,2-dimethylcyclohexanol

1967 ◽  
Vol 45 (7) ◽  
pp. 679-681
Author(s):  
K. G. Rutherford ◽  
R. M. Ottenbrite
Keyword(s):  
Thermal Decomposition ◽  
Low Temperature ◽  
Phthalic Anhydride ◽  
Ion Pair ◽  
Phthalate Ester ◽  
Hydrogen Phthalate ◽  
Isotope Study ◽  
Sterically Hindered ◽  
Low Temperature Pyrolysis

The hydrogen phthalate ester of trans-l,2-dimethylcyclohexanol was prepared by using phthalic anhydride enriched in 18O. The ester was partially decomposed at 128°. An observed enrichment of 18O in the alcohol portion of the undecomposed ester supports an earlier postulate that an ion pair is involved in the thermal decomposition of this sterically hindered ester.

Kinetic study of the second stage of the dolomite thermal decomposition

2008 ◽  
Vol 33 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Haykel Galai ◽  
Michèle Pijolat ◽  
Françoise Valdivieso ◽  
Kais Nahdi ◽  
Malika Trabelsi-Ayadi
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Second Stage

scholarly journals Kinetic study on thermal decomposition of toluene in a micro fluidized bed reactor

2015 ◽  
Vol 106 ◽  
pp. 721-727 ◽  
Author(s):  
Chao Gai ◽  
Yuping Dong ◽  
Pengfei Fan ◽  
Zhaoling Zhang ◽  
Jingcui Liang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor

scholarly journals Kinetic study on thermal decomposition of woods in oxidative environment

Fuel ◽  
2009 ◽  
Vol 88 (6) ◽  
pp. 1024-1030 ◽  
Author(s):  
D.K. Shen ◽  
S. Gu ◽  
K.H. Luo ◽  
A.V. Bridgwater ◽  
M.X. Fang
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study

scholarly journals Study of thermal behavior of phytic acid

2013 ◽  
Vol 49 (2) ◽  
pp. 275-283 ◽  
Author(s):  
André Luis Máximo Daneluti ◽  
Jivaldo do Rosário Matos
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Mass Loss ◽  
Kinetic Study ◽  
Phytic Acid ◽  
Absorption Spectroscopy ◽  
Elemental Analysis ◽  
Reaction Order ◽  
Dehydration Process ◽  
Thermogravimetric Method

Phytic acid is a natural compound widely used as depigmenting agent in galenic cosmetic emulsions. However, we have observed experimentally that phytic acid, when heated to 150 ºC for around one hour, shows evidence of thermal decomposition. Few studies investigating this substance alone with regard to its stability are available in the literature. This fact prompted the present study to characterize this species and its thermal behavior using thermal analysis (TG/DTG and DSC) and to associate the results of these techniques with those obtained by elemental analysis (EA) and absorption spectroscopy in the infrared region. The TG/DTG and DSC curves allowed evaluation of the thermal behavior of the sample of phytic acid and enabled use of the non-isothermal thermogravimetric method to study the kinetics of the three main mass-loss events: dehydration I, dehydration II and thermal decomposition. The combination of infrared absorption spectroscopy and elemental analysis techniques allowed evaluation of the intermediate products of the thermal decomposition of phytic acid. The infrared spectra of samples taken during the heating process revealed a reduction in the intensity of the absorption band related to O-H stretching as a result of the dehydration process. Furthermore, elemental analysis results showed an increase in the carbon content and a decrease in the hydrogen content at temperatures of 95, 150, 263 and 380 °C. Visually, darkening of the material was observed at 150 °C, indicating that the thermal decomposition of the material started at this temperature. At a temperature of 380 °C, thermal decomposition progressed, leading to a decrease in carbon and hydrogen. The results of thermogravimetry coupled with those of elemental analysis allow us to conclude that there was agreement between the percentages of phytic acid found in aqueous solution. The kinetic study by the non-isothermal thermogravimetric method showed that the dehydration process occurred in two stages. Dehydration step I promoted a process of vaporization of water (reaction order of zero), whereas dehydration step II showed an order of reaction equal to five. This change in reaction order was attributed to loss of chemically bonded water molecules of phytic acid or to the presence of volatile substances. Finally, the thermal decomposition step revealed an order of reaction equal to one. It was not possible to perform the kinetic study for other stages of mass loss.

scholarly journals Kinetic Study of the Thermal Decomposition of Potassium Chlorate Using the Non-isothermal TG/DSC Technique

2016 ◽  
Vol 13 (2) ◽  
pp. 505-525 ◽  
Author(s):  
Mohsen Ravanbod ◽  
Hamid Pouretedal ◽  
Mohammad Amini ◽  
Reza Ebadpour
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Potassium Chlorate ◽  
Isothermal Tg

Kinetic study of the thermal decomposition of octamethylcyclotetrasiloxane on activated gamma alumina

2017 ◽  
Vol 5 (5) ◽  
pp. 4858-4865 ◽  
Author(s):  
Alexandru C. Sonoc ◽  
Chris Thurgood ◽  
Brant Peppley ◽  
David G. Kelly
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Gamma Alumina
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