Resins
continue to occupy a place in the waterproof building market.
Unlike traditional concrete building materials, the polymerization
of resins requires initiators to support the required energy to drive
the reaction or reduce the polymerization threshold, which shows a
high reaction rate and low energy consumption in the polymerization
process. Azo compounds (azos) are energetic substances commonly used
in polymerization, but they can cause process hazards due to the amount
of heat release and accumulation of the resulting heat. To ensure
that similar hazards do not occur, the emerging azo initiators 2,2′-azobis(2-methylpropionamide)dihydrochloride
(AIBA), 2-cyanopropan-2-yliminourea (CABN), and 2,2′-azodi(2-methylbutyronitrile)
(AMBN) are explored. Depending on the process conditions, it is critical
to examine how chemical reactions from a laboratory behave at a large
scale. Kinetic models can be used to estimate fundamental safety parameters
suitable for assessing the reaction hazards and as control measures,
such as time to the maximum reaction rate under adiabatic conditions,
time to the conversion limit, and runaway determination for process
operation. The structure of this study is a combination of adiabatic
calorimeter data and a nonlinear adiabatic dynamics model with the
goal of helping to fill the void in research on thermal hazard analysis
of emerging azo initiators. The adiabatic data is used to analyze
the reaction mode characteristics of the azo compounds, and combined
with the external environment, the reaction and temperature parameter
changes of the azo compounds due to the reaction are discussed in
the actual situation.
Thermal equilibrium safety assessment of storage and transportation for 2,2'-Azobis(2,4dimethylvaleronitrile) initiator required for polymer resin in construction industries Chia-Feng Tsai & I-Jyh Wen | To cite this article: Chia-Feng Tsai & I-Jyh Wen | (2021) Thermal equilibrium safety assessment of storage and transportation for 2,2'-Azobis(2,4-dimethylvaleronitrile) initiator required for polymer resin in construction industries,
The application of polymerization initiators in a process can improve reaction efficiency and reduce energy loss. Azo compounds (azos) provide the required energy and promote polymerization for construction due to the heat release in the decomposition reaction. However, the heat release also brings related thermal hazards due to the lack of proper control. To reduce and avoid possible future hazards, the new azo initiators, 2,2′-Azobis(2-methylpropionamide)dihydrochloride (AIBA) is selected to explore the related thermal properties that are less studied by past literature. For the chemical process, its chemical reaction mechanism is extremely essential. In addition to being an influential foundation for process control, it is also used as a calculation basis for subsequent thermal hazard parameters, which is suitable for evaluating the degree of thermal hazard and emergency response. The assessment program includes kinetic model simulations and consecutive calculation on thermal safety parameters, such as TMRad and TCL for process operations. This study combines the thermogravimetric data with the nonlinear kinetics fitting on thermogram. The fitting results are derived back to the analysis formula which corresponds to the reaction mode to obtain the elementary reaction parameters and establish the kinetics process. The runaway mode and consequent thermal hazard parameters can also be obtained.
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