Flammability properties analysis of methylphenol-carbonate in diphenylcarbonate production process |
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Authors: | Y -M Chang C -M Shu |
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Institution: | (1) Doctoral Program, Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou, Yunlin, Taiwan, 64002, Republic of China |
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Abstract: | Diphenylcarbonate (DPC) has been regarded as a potential substitute material for highly toxic phosgene, reacting with bisphenol
A (BPA) in a phosgene-free process to produce polycarbonate (PC). For synthesizing DPC, methylphenylcarbonate (MPC) was the
critical intermediate with potential flammability in a transesterification reaction from dimethylcarbonate (DMC) and phenol.
Under the National Fire Protection Association (NFPA) criterion, MPC is viewed as one sort of combustible liquid (Class IIIB).
Once it fires or burns during storage, operation or transportation, it can cause a serious fire and explosion. However, researches
are still scanty in mentioning the basic but crucial fire and explosion features of MPC to date. A sound background of material
safety properties is essential for safe handling; in particular, flammability information is extremely crucial for a specific
chemical during a unit operation to prevent any fire and explosion hazards. In this study, we investigated the explosion limits
(LEL, UEL), maximum explosion pressure (P
max), maximum rate of explosion pressure rise ((dP/dt)max), and gas or vapor explosion constant (K
g) of MPC, according to its practical operating conditions (1 atm, 250°C, 21 vol.% O2) and by means of a 20 L vessel (20-L-Apparatus).
By surveying and defining the experimental data through flammability tests, these basic but crucial safety-related parameters
on flammability characteristics of MPC were proposed, so as to advance understanding and to avoid fire and explosion accidents
for such relevant processes. |
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Keywords: | 20-L-Apparatus diphenylcarbonate (DPC) explosion hazards fire hazards flammability characteristics methylphenylcarbonate (MPC) |
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