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Journal of Thermal Analysis and Calorimetry
Authors: Liu Yongjun, Ding Yangjun, Nan Zhaodong, Sun Haitao, and Zhang Honglin

Abstract  

The power-time curves of bacterial growth at different temperatures were determined by using the 2277 Thermal Activity Monitor (Sweden). From these curves, the growth rate constant (μ) and activation energy (E a) were calculated. According to the transition state theory of reaction dynamics, the activation entropy (ΔS), activation Gibbs free energy (ΔG) and equilibrium constant (K ) of the activation state could be calculated. These results permitted thermodynamic analysis of the bacterial growth metabolism.

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Abstract  

Many investigations and researches studied the reaction ability between high explosive RDX and RDX with other chemicals. However, accidents still occur and operating problems exist among the RDX manufacturing process. This study utilized inherent safety concepts and DSC thermal analysis to assess the incompatible reaction hazards of RDX during usage, handling, storage, transporting and manufacturing. This assessment includes thermal curve observations and kinetic evaluations. A decomposition mechanism of the incompatible reaction is proposed. Among all the contaminants evaluated in this study, the existence of ferrous chloride tetrahydrate, ferric chloride hexahydrate and nitric acid shifted the main endothermic and exothermic reactions of RDX. These contaminants further advanced the exothermic temperature onset average by about 53, 46 and 61C, respectively. The summarized results suggest that ferric oxide, ferrous chloride tetrahydrate, ferric chloride hexahydrate, acetone solution and nitric acid can influence the reaction and thermokinetic properties of RDX. These chemicals could induce potential hazards by causing temperature control instability, heating and cooling systems failure, and produce an unexpected secondary explosion. According to the conclusions of this study, potential incompatible RDX hazards during usage and manufacturing could be avoided.

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used to study any chemical changes occurring in a processed powder. The objective of this study was to analyze the phase transitions of ingredients and their influence on the thermokinetic properties of powder milk baby formulas using DSC as

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. Martinez-dlCruz , L , Pfeiffer , H . Effect of the oxygen addition on the thermokinetic properties of CO 2 chemisorption on Li 2 ZrO 3 . Ind Eng Chem Res . 2010 ; 49 : 9038 – 9042 . 10.1021/ie1005417 . 49

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