The thermal behaviour of dicarboxylic acids in various atmospheres

Muraishi, Kazuo; Suzuki, Yukihiko

doi:10.1016/0040-6031(94)80059-6

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…Thermal analysis confirmed that both MAL and SA lost weight after melting, suggesting decomposition, and the boiling of MAL, and/or conversion of MAL into fumaric acid, as reported in the literature (34)(35)(36)(37). Since MAL and SA rapidly decomposed after the crystal melted, cocrystal preparation using a melting method as previously reported (38) would be difficult.…”

Section: Cocrystal Screening and Solid Analysissupporting

confidence: 81%

Dissolution Improvement and the Mechanism of the Improvement from Cocrystallization of Poorly Water-soluble Compounds

Shiraki¹,

Takata²,

Takano³

et al. 2008

Pharm Res

169

109

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Section: Cocrystal Screening and Solid Analysissupporting

confidence: 81%

Dissolution Improvement and the Mechanism of the Improvement from Cocrystallization of Poorly Water-soluble Compounds

Shiraki¹,

Takata²,

Takano³

et al. 2008

Pharm Res

169

109

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“…This mechanism does not include possible side reactions. For example gas chromatographic data 30 indicate the presence of CO that is likely a product of the thermal decomposition of acetic acid formed in the main step of decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…Although heating of some organic compounds results in vaporization without decomposition, malonic acid is known − ,− to decompose in accord with the following mechanism: This mechanism does not include possible side reactions. For example gas chromatographic data indicate the presence of CO that is likely a product of the thermal decomposition of acetic acid formed in the main step of decomposition.…”

Section: Resultsmentioning

confidence: 99%

Thermal Decomposition Kinetics of Malonic Acid in the Condensed Phase

Stanford

Vyazovkin

2017

Ind. Eng. Chem. Res.

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This study reexamines an early literature report of an unusual phenomenon of a dramatic difference in the activation energy for the thermal decomposition of malonic (propanedioic) acid in the liquid and solid states. The study has been carried out via thermogravimetric analysis (TGA) to probe possible differences between the kinetics in three condensed phases: solid, liquid, and supercooled liquid. An advanced isoconversional method has been applied to determine the activation energy, preexponential factor, and reaction model. The activation energy as well as preexponential factor for the decomposition processes in all three condensed phases have been determined to be practically the same: E = 110 ± 10 kJ mol −1 and log(A/min −1 ) = 13 ± 1. In all phases, the reaction kinetics has been found to follow the reaction order model. The reaction order values have been similar for the liquid and supercooled liquid phases but markedly smaller for the solid-phase decomposition. The results obtained have not confirmed the phenomenon reported in the early literature. A practically important conclusion of the present study is that the liquid-phase kinetic data can be used to obtain a reasonable estimate for the thermal stability of this compound in the solid phase.

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“…A comparison of the average particle size and the mean crystallite size, determined from the X-ray diffraction data, indicates a polycrystalline nature of the particles. Three dicarboxylic acids used in this study have a common formula HOOC(CH 2 ) n COOH (n¼ 0, 1, and 4, for oxalic, malonic, and adipic acid, respectively) and differ from each other in chain lengths, which results in different thermal behaviours [24]. Fig.…”

Section: Resultsmentioning

confidence: 99%

The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite

Kuzmanović

Jugović

Mitrić

et al. 2015

Ceramics International

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Olivine-type LiFePO 4 composite powders with carbon were synthesized by freeze drying and subsequent thermal annealing. The main purpose of the research is to explore how various dicarboxylic acids as carbon sources influence the electrochemical properties of the resulting composites. Three dicarboxylic acids (oxalic, malonic, and adipic) were used as a carbon source. The synthesis was followed by X-ray powder diffraction, scanning electron microscopy, particle-size analysis, and electrochemical experiments. It is shown that the amount of the in situ formed carbon depends on the thermal behaviour of the acids in inert atmosphere rather than on their carbon content. Cyclic voltammetry experiments and galvanostatic cycling illustrate the behaviour of different powders: the powder obtained with oxalic acid yields the highest discharge capacity at small currents, while the one obtained with adipic acid shows better high-current response. Malonic acid has turned out to be a poor carbon source and it consequently yields powder with poor electrochemical performance.

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The thermal behaviour of dicarboxylic acids in various atmospheres

Cited by 16 publications

References 11 publications

Dissolution Improvement and the Mechanism of the Improvement from Cocrystallization of Poorly Water-soluble Compounds

Dissolution Improvement and the Mechanism of the Improvement from Cocrystallization of Poorly Water-soluble Compounds

Thermal Decomposition Kinetics of Malonic Acid in the Condensed Phase

The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite

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