• Journal of the Korean Society of Safety
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• v.32 no.2
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• pp.66-71
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• 2017

The autoignition temperature (AIT) is crucial combustible characteristics which need attention in chemical process that handle hazardous materials. The AIT, also to as minimum spontaneous ignition temperature(MSIT), is the lowest temperature of a hot surface at which the substance will spontaneously ignite without any obvious sources of ignition such as a spark or flame. The AIT may be used as combustion property to specify operating, storage, and materials handling procedures for process safety. This study measured the AITs of n-propanol+acetic acid system from ignition delay time(time lag) by using ASTM E659 apparatus. The AITs of n-propanol and acetic acid which constituted binary system were $435^{\circ}C$ and $212^{\circ}C$, respectively. The experimental AITs of n-propanol+acetic acid system were a good agreement with the calculated AITs by the proposed equations with a few A.A.D.(average absolute deviation). In the case of n-propanol and acetic acid system, the minimum autoignition temperature behavior (MAITB), which is lower than the lower AIT, is shown among the two pure substances constituting the mixture.

• Journal of the Korean Society of Safety
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• v.23 no.6
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• pp.70-75
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• 2008

The values of the AIT(Autoignition temperature) for fire and explosion protection are normally the lowest reported. The minimum autoignition temperature behavior(MAITB) of flammable liquid mixtures is exhibited when the AIT of mixture is below the AIT of the individual components. The MAITB is an interesting experimental features, which can be significant from the perspective of industrial safety. In this study, the AITs of m-xylene+n-butyric acid and ethylbenzene+n-butanol systems were measured using ASTM E659-78 apparatus. The AITs of m-xylene, n-butyric acid, ethylbenzene and n-butanol which constituted two binary systems were $587^{\circ}C$, $510^{\circ}C$, $475^{\circ}C$ and $340^{\circ}C$ respectively. The m-xylene+n-butyric acid system is exhibited MAITB at 0.3 mole fraction of m-xylene, and its minimum autoignition temperature was $460^{\circ}C$.

• Journal of the Korean Institute of Gas
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• v.18 no.3
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• pp.31-37
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• 2014

The aim of this work is to provide new experimental data on the pyrolysis characteristics and the minimum ignition energy (MIE) by using the same high-density polyethylene (HDPE) powder in domestic HDPE dust explosion accident. To evaluate the explosion sensitivity of HDPE, thermo-gravimetric analysis (TGA), differential scanning calorimeter (DSC) and MIE apparatus (MIKE-3, K$\ddot{u}$hner) was conducted. The measurements showed the volume median diameter of $61.6{\mu}m$ but the particle number density of 98 % in the range $0.4{\sim}4{\mu}m$. The ignition temperature from the results of TGA and DSC in HDPE dust layers was observed in the range of $380{\sim}490^{\circ}C$. MIE was measured under 1 mJ in the HDPE dust concentration of $1200{\sim}1800g/m^3$, it was found that the ratio of particle number density in the range $0.4{\sim}4{\mu}m$ was very high (98%).

• Journal of the Korean Institute of Gas
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• v.23 no.6
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• pp.17-24
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• 2019

The combustion properties of the flammable substance used in industrial fields include lower/upper flash point, lower/upper explosion limit, autoignition temperature(AIT), fire point, and minimum oxygen concentration(MOC) etc.. The accurate assessment of these characteristics should be made for process and worker safety. In this study, tert-amylalcohol(TAA), which is widely used as a solvent for epoxy resins, oxidizers of olefins, fuel oils and biomass, was selected. The reason is that there are few researches on the reliability of combustion characteristics compared to other flammable materials. The flash point of the TAA was measured by Setaflash, Pensky-Martens, Tag, and Cleveland testers. And the AIT of the TAA was measured by ASTM 659E. The lower/upper explosion limits of the TAA was estimated using the measured lower/upper flash points by Setaflash tester. The flash point of the TAA by using Setaflash and Pensky-Martens closed-cup testers were experimented at 19 ℃ and 21 ℃, respectively. The flash points of the TAA by Tag and Cleveland open cup testers were experimented at 28 ℃ and 34 ℃, respectively. The AIT of the TAA was experimented at 437 ℃. The LEL and UEL calculated by using lower and upper flash point of Setaflash were calculated at 1.10 vol% and 11.95 vol%, respectively.