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http://dx.doi.org/10.9713/kcer.2019.57.6.790

Characteristics of Dust Explosion in Dioctyl Terephthalic Acid Manufacturing Process  

Lee, Chang Jin (Department of New Energy Engineering, Seoul National University of Science & Technology)
Kim, Lae Hyun (Department of Chemical & Biomolecular Engineering, Seoul National University of Science & Technology)
Publication Information
Korean Chemical Engineering Research / v.57, no.6, 2019 , pp. 790-803 More about this Journal
Abstract
The dioctyl terephthalic acid (DOTP) process produces plastic plasticizers by esterification of terephthalic acid with powder in the form of octanol. In this study, the dust explosion characteristics of terephthalic acid directly injected into the manhole in the form of powder in the presence of flammable solvent or vapor in the reactor of this process were investigated. Dust particle size and particle size distribution dust characteristics were investigated, and pyrolysis characteristics of dust were investigated to estimate fire and explosion characteristics and ignition temperature. Also, the minimum ignition energy experiment was performed to evaluate the explosion sensitivity. As a result, the average particle size of terephthalic acid powder was $143.433{\mu}m$. From the thermal analysis carried out under these particle size and particle size distribution conditions, the ignition temperature of the dust was about $253^{\circ}C$. The lower explosive limit (LEL) of the terephthalic acid was determined to be $50g/m^3$. The minimum ignition energy (MIE) for explosion sensitivity is (10 < MIE < 300) mJ, and the estimated minimum ignition energy (Es) based on the ignition probability is 210 mJ. The maximum explosion pressure ($P_{max}$) and the maximum explosion pressure rise rate $({\frac{dP}{dt}})_{max}$ of terephthalic acid dust were 7.1 bar and 511 bar/s, respectively. The dust explosion index (Kst) was 139 mbar/s, corresponding to the dust explosion grade St 1.
Keywords
Dust explosion; p-terephthalic acid; Minimum ignition energy (MIE); Plasticizer;
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