Authors:Shang-Hao Liu, Chun-Ping Lin, and Chi-Min Shu
by the National Fire Protection Association (NFPA) [ 7 ].
We investigated the thermokineticparameters for CHP, DTBP, and TBPB by differential scanning calorimetry (DSC) [ 8 ]. The activation energy ( E a ) for CHP, DTBP, and TBPB at different
Authors:Lung-Chang Tsai, Yun-Ting Tsai, Chun-Ping Lin, Shang-Hao Liu, Tsung-Chih Wu, and Chi-Min Shu
examined using a thermal dynamic calorimeter (differential scanning calorimetry, DSC) and isothermal microcalorimeter (thermal activity monitor III, TAM III) to evaluate basic exothermic decomposition and various thermokineticparameters. Furthermore
Information about the kinetics and thermal
decomposition of hydrogen peroxide (H2O2)
has been required for safety reasons, due to its broad applications in many
chemical industries. To determine the inherent hazards during H2O2
manufacturing, transportation, disposal, usage, and so on, this study deliberately
selected various H2O2 concentrations
and analyzed them by differential scanning calorimetry (DSC). In addition,
thermokinetic parameters were not only established for each of these reactions,
but also aimed at comprehensive, kinetic models with various tests conducted
at different heating rates.
To build up a comprehensive kinetic
model, various tests were conducted by heating rates of 1, 2, 4, 10C
min–1, respectively. According to dynamic
DSC tests, the experimental curves show that H2O2
decomposition has one exothermic peak and may start to decompose under 47–81C.
The total heat of decomposition is about 192–1079 J g–1.
Not only can these results prevent accidents caused by H2O2
during storage and transportation, but also assess its inherent hazards and
thereby design procedures for emergency response while runaway reactions occurring.
Authors:Kuang-Hua Hsueh, Wei-Ting Chen, Yung-Chuan Chu, Lung-Chang Tsai, and Chi-Min Shu
are not well understood. Due to the hazardous consequences of decomposition of BTBPC and its extensive use in the industry, we made efforts to understand the runaway reaction phenomena by evaluating the thermokineticparameters.
In this study
goals of this study were to obtain reliably accurate thermokineticparameters that can be applied to industrial manufacturing processes and incompatible reactions to avoid a reaction disaster.
The thermal activity monitor III (TAM III) [ 8 , 9
Authors:Mei-Li You, Jo-Ming Tseng, Ming-Yang Liu, and Chi-Min Shu
Pooling lauroyl peroxide (LPO) with nitric acid, we used differential scanning calorimetry (DSC) to assess the thermokinetic
parameters, such as exothermic onset temperature (T0), heat of decomposition (ΔHd), frequency factor (A), and the other safety parameters. When LPO was contaminated with nitric acid (HNO3), we found the exploder 1-nitrododecane. Obvious products were sensitive and hazardous chemicals. Concentration reaching
1–12 N HNO3 emitted a large amount of heat. This study combined with curve-fitting method to elucidate its unsafe characteristics and
thermally sensitive structure to help prevent runaway reactions, fires and explosions in the process environment. According
to the findings and the concept of inherently safer design, LPO runaway reactions could be adequately prevented in the relevant
Authors:Xia Yang, Lei Feng, Kang-Zhen Xu, Hui-Zhou Gao, Chao Jia, Cheng-Cheng Liu, Jian-Min Xiao, Le Zhai, Li-Sheng Zhou, and Ke-Wu Yang
determination of the differential heat of adsorption [ 11 ], and Yang et al. explored inhibition of two cephalosporins on E. coli [ 12 ]. Recently, we reported the determination of thermokineticparameters of penicillin G hydrolysis catalyzed by MβL L1 from
Authors:Y.-P. Chou, H.-Y. Hou, R.-H. Chang, M.-L. You, J.-Y. Peng, and C.-M. Shu
Cumene hydroperoxide (CHP) and its derivatives have caused many serious explosions and fires in Taiwan as a consequence of
thermal instability, chemical contamination, and even mechanical shock. It has been employed in polymerization for producing
phenol and dicumyl peroxide (DCPO). Differential scanning calorimetry (DSC) was used to analyze the thermal hazard of CHP
in the presence of sodium hydroxide (NaOH), sulfuric acid (H2SO4), and sodium bisulfite (Na2SO3). Thermokinetic parameters for decomposition, such as exothermic onset temperature (T0), maximum temperature (Tmax), and enthalpy (ΔH), were obtained from the thermal curves. Isothermal microcalorimetry (thermal activity monitor, TAM) was employed to investigate
the thermal hazards during CHP storage and CHP mixed with NaOH, H2SO4, and Na2SO3 under isothermal conditions in a reactor or container. Tests by TAM indicated that from 70 to 90 °C an autocatalytic reaction
was apparent in the thermal curves. According to the results from the TAM test, high performance liquid chromatography (HPLC)
was, in turn, adopted to analyze the result of concentration versus time. By the Arrhenius equation, the activation energy
(Ea) and rate constant (k) were calculated. Depending on the process conditions, NaOH was one of the incompatible chemicals or catalysts for CHP. When
CHP is mixed with NaOH, the T0 is induced earlier and the reactions become more complex than for pure CHP, and the Ea is lower than for pure CHP.
Authors:Hui-Zhou Gao, Qi Yang, Xiao-Yan Yan, Zhu-Jun Wang, Ji-Li Feng, Xia Yang, Sheng-Li Gao, Lei Feng, Xu Cheng, Chao Jia, and Ke-Wu Yang
understand the procedure of β-lactam containing antibiotics hydrolysis catalyzed by MβLs, this paper first reports the determination of thermokineticparameters of penicillin G hydrolysis catalyzed by MβL L1 from Stenotrophomonas maltophilia by
Authors:Yu-Chuan Chou, Tung-Feng Hsieh, Yu-Chen Hsieh, Chun-Ping Lin, and Chi-Min Shu
Multi-walled carbon nanotubes (MWCNTs) have remarkable properties. However, their thermal stability characteristics, which
may represent potential hazards during the production or utilization stage, concern unsafe or unknown properties researches.
Our aim was to analyze the thermokinetic parameters of different heating rates by differential scanning calorimetry (DSC)
and thermogravimetric analyzer (TG), and then to compare thermal decomposition energy parameters under various conditions
by well-known kinetic equations. MWCNTs were acidified via nitric acid (HNO3) in various concentrations from 3 to 15 N and were characterized by means of Fourier transform infrared (FTIR) spectrometry.
For original and modified MWCNTs, we further identified the thermal degradation characteristics of the functional group by
TG-FTIR. Finally, we established an effective and prompt procedure for receiving information on thermal decomposition characteristics
and reaction hazard of MWCNTs that could be applied as an inherently safer design during normal or upset operation.