The Experts below are selected from a list of 2403 Experts worldwide ranked by ideXlab platform
Yihwen Wang - One of the best experts on this subject based on the ideXlab platform.
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Thermal explosion simulation and incompatible reaction of dicumyl peroxide by calorimetric technique
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Sunju Shen, Jen-hao Chi, Yihwen WangAbstract:Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstable reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially thermal hazard characteristics. In order to analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (Δ H _d) and exothermic onset temperature ( T _0), were measured via differential scanning calorimetry (DSC). Thermal Runaway phenomena were then thoroughly investigated by DSC. The thermokinetics of DCPO mixed with acids or bases were determined by DSC, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Solid thermal explosion (STE) and liquid thermal explosion (LTE) simulations of TSS were applied to determine the fundamental thermal explosion Behavior in large tanks or drums. Results from curve fitting indicated that all of the acids or bases could induce exothermic reactions at even an earlier stage of the experiments. In order to diminish the extent of hazard, hazard information must be provided to the manufacturing process. Thermal hazard of DCPO mixed with nitric acid (HNO_3) was more dangerous than with other acids including sulfuric acid (H_2SO_4), phosphoric acid (H_3PO_4), and hydrochloric acid (HCl). By DSC, T _0, heat of decomposition (Δ H _d), and activation energy ( E _a) of DCPO mixed with HNO_3 were calculated to be 70 °C, 911 J g^−1, and 33 kJ mol^−1, respectively.
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thermal explosion simulation and incompatible reaction of dicumyl peroxide by calorimetric technique
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Shenghung Wu, Sunju Shen, Yihwen WangAbstract:Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstable reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially thermal hazard characteristics. In order to analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (ΔHd) and exothermic onset temperature (T0), were measured via differential scanning calorimetry (DSC). Thermal Runaway phenomena were then thoroughly investigated by DSC. The thermokinetics of DCPO mixed with acids or bases were determined by DSC, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Solid thermal explosion (STE) and liquid thermal explosion (LTE) simulations of TSS were applied to determine the fundamental thermal explosion Behavior in large tanks or drums. Results from curve fitting indicated that all of the acids or bases could induce exothermic reactions at even an earlier stage of the experiments. In order to diminish the extent of hazard, hazard information must be provided to the manufacturing process. Thermal hazard of DCPO mixed with nitric acid (HNO3) was more dangerous than with other acids including sulfuric acid (H2SO4), phosphoric acid (H3PO4), and hydrochloric acid (HCl). By DSC, T0, heat of decomposition (ΔHd), and activation energy (Ea) of DCPO mixed with HNO3 were calculated to be 70 °C, 911 J g−1, and 33 kJ mol−1, respectively.
Sunju Shen - One of the best experts on this subject based on the ideXlab platform.
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Thermal explosion simulation and incompatible reaction of dicumyl peroxide by calorimetric technique
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Sunju Shen, Jen-hao Chi, Yihwen WangAbstract:Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstable reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially thermal hazard characteristics. In order to analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (Δ H _d) and exothermic onset temperature ( T _0), were measured via differential scanning calorimetry (DSC). Thermal Runaway phenomena were then thoroughly investigated by DSC. The thermokinetics of DCPO mixed with acids or bases were determined by DSC, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Solid thermal explosion (STE) and liquid thermal explosion (LTE) simulations of TSS were applied to determine the fundamental thermal explosion Behavior in large tanks or drums. Results from curve fitting indicated that all of the acids or bases could induce exothermic reactions at even an earlier stage of the experiments. In order to diminish the extent of hazard, hazard information must be provided to the manufacturing process. Thermal hazard of DCPO mixed with nitric acid (HNO_3) was more dangerous than with other acids including sulfuric acid (H_2SO_4), phosphoric acid (H_3PO_4), and hydrochloric acid (HCl). By DSC, T _0, heat of decomposition (Δ H _d), and activation energy ( E _a) of DCPO mixed with HNO_3 were calculated to be 70 °C, 911 J g^−1, and 33 kJ mol^−1, respectively.
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thermal explosion simulation and incompatible reaction of dicumyl peroxide by calorimetric technique
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Shenghung Wu, Sunju Shen, Yihwen WangAbstract:Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstable reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially thermal hazard characteristics. In order to analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (ΔHd) and exothermic onset temperature (T0), were measured via differential scanning calorimetry (DSC). Thermal Runaway phenomena were then thoroughly investigated by DSC. The thermokinetics of DCPO mixed with acids or bases were determined by DSC, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Solid thermal explosion (STE) and liquid thermal explosion (LTE) simulations of TSS were applied to determine the fundamental thermal explosion Behavior in large tanks or drums. Results from curve fitting indicated that all of the acids or bases could induce exothermic reactions at even an earlier stage of the experiments. In order to diminish the extent of hazard, hazard information must be provided to the manufacturing process. Thermal hazard of DCPO mixed with nitric acid (HNO3) was more dangerous than with other acids including sulfuric acid (H2SO4), phosphoric acid (H3PO4), and hydrochloric acid (HCl). By DSC, T0, heat of decomposition (ΔHd), and activation energy (Ea) of DCPO mixed with HNO3 were calculated to be 70 °C, 911 J g−1, and 33 kJ mol−1, respectively.
Shenghung Wu - One of the best experts on this subject based on the ideXlab platform.
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thermal hazard analyses of organic peroxides and inorganic peroxides by calorimetric approaches
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Shenghung Wu, Hungcheng Chou, Yihao Huang, Jaojia HorngAbstract:Abstract Organic peroxides (OPs) and inorganic peroxides (IPs) are usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent in low density polyethylene (LDPE), polyvinyl chloride (PVC), controlled-rheology polypropylene (CR-PP), and styrene industries. Worldwide, due to their unstably reactive natures, OPs and IPs have caused many serious thermal explosions and Runaway reaction incidents. This study was conducted to elucidate its essentially hazardous characteristics. To analyze the Runaway Behavior of OPs and IPs in the traditional process, thermokinetic parameters including heat of decomposition (ΔHd), exothermic onset temperature (T0), self-accelerating decomposition temperature (SADT), time to maximum rate (TMR), critical temperature (Tc), etc., were measured by calorimetric approaches involving differential scanning calorimetry (DSC), vent sizing package 2 (VSP2), and calculation method. Safety and health handling information of hazardous materia...
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thermal explosion simulation and incompatible reaction of dicumyl peroxide by calorimetric technique
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Shenghung Wu, Sunju Shen, Yihwen WangAbstract:Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstable reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially thermal hazard characteristics. In order to analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (ΔHd) and exothermic onset temperature (T0), were measured via differential scanning calorimetry (DSC). Thermal Runaway phenomena were then thoroughly investigated by DSC. The thermokinetics of DCPO mixed with acids or bases were determined by DSC, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Solid thermal explosion (STE) and liquid thermal explosion (LTE) simulations of TSS were applied to determine the fundamental thermal explosion Behavior in large tanks or drums. Results from curve fitting indicated that all of the acids or bases could induce exothermic reactions at even an earlier stage of the experiments. In order to diminish the extent of hazard, hazard information must be provided to the manufacturing process. Thermal hazard of DCPO mixed with nitric acid (HNO3) was more dangerous than with other acids including sulfuric acid (H2SO4), phosphoric acid (H3PO4), and hydrochloric acid (HCl). By DSC, T0, heat of decomposition (ΔHd), and activation energy (Ea) of DCPO mixed with HNO3 were calculated to be 70 °C, 911 J g−1, and 33 kJ mol−1, respectively.
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evaluation of Runaway reaction for dicumyl peroxide in a batch reactor by dsc and vsp2
Journal of Loss Prevention in The Process Industries, 2009Co-Authors: Shenghung Wu, Meiling Shyu, I YetpoleAbstract:Abstract Dicumyl peroxide (DCPO) is usually employed as an initiator for polymerization, a source of free radicals, a hardener, and a linking agent. In Asia, due to its unstably reactive nature, DCPO has caused many thermal explosions and Runaway reaction incidents in the manufacturing process. This study was conducted to elucidate its essentially hazardous characteristics. To analyze the Runaway Behavior of DCPO in a batch reactor, thermokinetic parameters, such as heat of decomposition (ΔH d ), exothermic onset temperature ( T 0 ), maximum temperature rise ((d T d t −1 ) max ), maximum pressure rise ((d P d t −1 ) max ), and self-heating rate, were measured via differential scanning calorimetry (DSC) and vent sizing package 2 (VSP2). Meanwhile, adiabatic thermal Runaway phenomena were then thoroughly investigated by VSP2. The thermokinetics of DCPO mixed with acids or bases was determined by DSC/VSP2, and the experimental data were compared with kinetics-based curve fitting of thermal safety software (TSS). Results from curve fitting indicated that all of the above-mentioned acids or bases could induce exothermic reactions at even an earlier stage of the experiments. To diminish the degree of hazard, hazard information must be provided to the manufacturing process.
Zhenpo Wang - One of the best experts on this subject based on the ideXlab platform.
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overcharge to thermal Runaway Behavior and safety assessment of commercial lithium ion cells with different cathode materials a comparison study
Journal of Energy Chemistry, 2021Co-Authors: Zhenpo Wang, Lvwei Huang, Xiaoqing Zhu, Jing Yuan, Hsin Wang, Yituo WangAbstract:Abstract In this paper, overcharge Behaviors and thermal Runaway (TR) features of large format lithium-ion (Li-ion) cells with different cathode materials (LiFePO4 (LFP), Li[Ni1/3Co1/3Mn1/3]O2 (NCM111), Li[Ni0.6Co0.2Mn0.2]O2 (NCM622) and Li[Ni0.8Co0.1Mn0.1]O2 (NCM811)) were investigated. The results showed that, under the same overcharge condition, the TR of LFP Li-ion cell occurred earlier compared with the NCM Li-ion cells, indicating its poor overcharge tolerance and high TR risk. However, when TR occurred, LFP Li-ion cell exhibited lower maximum temperature and mild TR response. All NCM Li-ion cells caught fire or exploded during TR, while the LFP Li-ion cell only released a large amount of smoke without fire. According to the overcharge Behaviors and TR features, a safety assessment score system was proposed to evaluate the safety of the cells. In short, NCM Li-ion cells have better performance in energy density and overcharge tolerance (or low TR risk), while LFP Li-ion cell showed less severe response to overcharging (or less TR hazards). For NCM Li-ion cells, as the ratio of nickel in cathode material increases, the thermal stability of the cathode materials becomes poorer, and the TR hazards increase. Such a comparison study on large format Li-ion cells with different cathode materials can provide deeper insights into the overcharge Behaviors and TR features, and provide guidance for engineers to reasonably choose battery materials in automotive applications.
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thermal Runaway Behavior during overcharge for large format lithium ion batteries with different packaging patterns
Journal of energy storage, 2019Co-Authors: Lvwei Huang, Zhaosheng Zhang, Zhenpo Wang, Lei Zhang, Xiaoqing Zhu, David D DorrellAbstract:Abstract Lithium-ion batteries are the main energy storage unit for electric vehicles. The prevention of thermal Runaway is essential for ensuring safe operation of these batteries. Different cell packaging patterns have an influence on the thermal Runaway Behavior of lithium-ion batteries during overcharging. In this paper, prismatic and pouch lithium-ion battery cells with the same capacity and chemistries are used to experimentally investigate the internal failure mechanisms and associated external characteristics during overcharging. The entire overcharge process is divided into five stages according to the voltage and temperature curves. The results indicate that the pouch battery cell exhibits better thermal Behavior characteristic and overcharge tolerance when compared to the prismatic battery cell in stages I to III. However, the prismatic battery cell has better thermal Runaway buffering characteristic, smaller deformation and longer early warning time. This is due to the use of a safety valve which results in subsided damage caused by thermal Runaway. Their maximum surface temperature differences increase linearly with the overcharge process, until thermal Runaway occurs and rapid rise to the highest temperature point takes place. These results provide an insight into the safety and thermal management design of battery systems.
Lvwei Huang - One of the best experts on this subject based on the ideXlab platform.
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overcharge to thermal Runaway Behavior and safety assessment of commercial lithium ion cells with different cathode materials a comparison study
Journal of Energy Chemistry, 2021Co-Authors: Zhenpo Wang, Lvwei Huang, Xiaoqing Zhu, Jing Yuan, Hsin Wang, Yituo WangAbstract:Abstract In this paper, overcharge Behaviors and thermal Runaway (TR) features of large format lithium-ion (Li-ion) cells with different cathode materials (LiFePO4 (LFP), Li[Ni1/3Co1/3Mn1/3]O2 (NCM111), Li[Ni0.6Co0.2Mn0.2]O2 (NCM622) and Li[Ni0.8Co0.1Mn0.1]O2 (NCM811)) were investigated. The results showed that, under the same overcharge condition, the TR of LFP Li-ion cell occurred earlier compared with the NCM Li-ion cells, indicating its poor overcharge tolerance and high TR risk. However, when TR occurred, LFP Li-ion cell exhibited lower maximum temperature and mild TR response. All NCM Li-ion cells caught fire or exploded during TR, while the LFP Li-ion cell only released a large amount of smoke without fire. According to the overcharge Behaviors and TR features, a safety assessment score system was proposed to evaluate the safety of the cells. In short, NCM Li-ion cells have better performance in energy density and overcharge tolerance (or low TR risk), while LFP Li-ion cell showed less severe response to overcharging (or less TR hazards). For NCM Li-ion cells, as the ratio of nickel in cathode material increases, the thermal stability of the cathode materials becomes poorer, and the TR hazards increase. Such a comparison study on large format Li-ion cells with different cathode materials can provide deeper insights into the overcharge Behaviors and TR features, and provide guidance for engineers to reasonably choose battery materials in automotive applications.
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thermal Runaway Behavior during overcharge for large format lithium ion batteries with different packaging patterns
Journal of energy storage, 2019Co-Authors: Lvwei Huang, Zhaosheng Zhang, Zhenpo Wang, Lei Zhang, Xiaoqing Zhu, David D DorrellAbstract:Abstract Lithium-ion batteries are the main energy storage unit for electric vehicles. The prevention of thermal Runaway is essential for ensuring safe operation of these batteries. Different cell packaging patterns have an influence on the thermal Runaway Behavior of lithium-ion batteries during overcharging. In this paper, prismatic and pouch lithium-ion battery cells with the same capacity and chemistries are used to experimentally investigate the internal failure mechanisms and associated external characteristics during overcharging. The entire overcharge process is divided into five stages according to the voltage and temperature curves. The results indicate that the pouch battery cell exhibits better thermal Behavior characteristic and overcharge tolerance when compared to the prismatic battery cell in stages I to III. However, the prismatic battery cell has better thermal Runaway buffering characteristic, smaller deformation and longer early warning time. This is due to the use of a safety valve which results in subsided damage caused by thermal Runaway. Their maximum surface temperature differences increase linearly with the overcharge process, until thermal Runaway occurs and rapid rise to the highest temperature point takes place. These results provide an insight into the safety and thermal management design of battery systems.
