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UNIFAC 그룹 기여 모델에 의한 n-Octnae+n-Decane 계와 n-Octane+n-Dodecane 계의 인화점 계산
하동명 ( Dong Myeong Ha ),이성진 ( Sungjin Lee ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.4
The flash point is used to categorize inflammable liquids according to their relative flammability. Such a categorization is important for the safe handling, storage, and transportation of inflammable liquids. The flash point temperature of two binary liquid mixtures(n-octane+n-decane and n-octane+n-dodecane) has been measured for the entire concentration range using Seta-flash closed cup tester based on the ASTM D3278 method. The closed cup flash point temperature was estimated using the UNIFAC(Universal Functional Activity Coefficient) group contribution model. The experimentally derived flash point was also compared with the predicted flash point from the UNIFAC model. The UNIFAC model is able to estimate the flash point fairly well for n-octane+n-decane mixture and n-octane+n-dodecane mixture.
이소프로필 알코올의 화재 및 폭발 특성치의 측정 및 고찰
하동명(Dong-Myeong Ha) 한국가스학회 2012 한국가스학회지 Vol.16 No.3
이소프로필 알코올의 안전한 취급을 위해 25℃에서 폭발한계를 고찰하였고, 실험장치를 이용하여 하부인화점, 상부인화점, 연소점 그리고 발화지연시간에 의한 발화온도를 측정하였다. 그 결과, 공정의 안전을 위한 이소프로필 알코올의 폭발 하한계는 2.0 vol%이고, 상한계는 12.0 vol%로 문헌을 통해 판단되었다. 하부인화점은 밀폐계에서 12~ 14℃와 개방식에서 18 ~ 19℃이었고, 상부인화점은 38℃로 측정되었다. ASTM E659 장치를 사용하여 측정된 최소자연발화온도는 463 ℃이었다. For the safe handling of isopropyl alcohol, the explosion limits were investigated. The lower flash points, upper flash points, fire point, and AITs(autoignition temperatures) by ignition time delay for isopropyl alcohol were experimented. By using literature data, the lower and upper explosion limits of isopropyl alcohol were recommended as 2.0 and 12.0 vol%, respectively. The lower flash points of isopropyl alcohol were experimented 12~14℃ by using closed-cup tester and 18~19℃ by using open cup tester. And the upper flash points of isopropyl alcohol was experimented 38℃ by using Setaflash closed-cup tester. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 apparatus was 46 3℃.
The Measurement of Lower Flash Point for tert-Pentanol+n-Decane System Using Tag Open-Cup Tester
Dong-Myeong Ha(하동명),Sungjin Lee(이성진) 한국가스학회 2012 한국가스학회지 Vol.16 No.5
인화점은 공기 속 가연성 증기의 농도가 연소하한계(lower flammability limit)에 도달할 때의 최적 온도이며, 산업현장에서 사용하는 물질들의 화재와 폭발의 위험성을 결정하는 중요한 물성치이다. 단일 성분의 인화점 정보는 여러 문헌에서 얻을 수 있으나, 이성분계 혼합물의 인화점은 충분히 제공되어 있지 않다. 본 연구에서는 tert-pentanol+n-decanel 계의 인화점을 Tag 개방식 장치를 이용하여 측정하였다. 실험값은 Raoult의 법칙과, Wilson식과 NRTL식을 활용한 최적화 기법에 의해 계산된 값들과 비교되었다. 최적화 기법에 의한 계산값이 Rauolt의 법칙에 의한 계산값 보다 실험값에 더욱 근접하였다. The flash point the lowest temperature at which the concentration of vapor of the substance in the air reaches the lower flammability limit(LFL), and is one of the most important physical properties used to determine the potential for fire and explosion hazards of industrial materials. The most published flash point data was for pure components and the flash points of the binary solutions that have flammable components, appear to be scarce in the literature. In the present study, the flash points of tert-pentanol+n-decane system were measured by Tag open-cup tester. The measured data were compared with the values calculated by the Raoult’s law and the optimization methods based on the Wilson and NRTL equations. The calculated values by optimization methods were found to be better than those based on the Raoult’s law.
하동명(Dong Myeong Ha),이성진(Sung Jin Lee) 한국가스학회 2009 한국가스학회지 Vol.13 No.4
MSDS 자료의 적정성을 고찰하기 위해 크실렌 이성질체에 대해 Pensky-Martens 밀폐식(ASTM D93), Setaflash 밀폐식(ASTM D3278), Tag 개방식(ASTM D1310), Cleveland 개방식(ASTM D92)장치 등을 이용하여 인화점을 측정하였으며, 또한 최소자연발화온도는 ASTM E659-78장치를 사용하여 측정하고, 문헌값들과 한국산업안전보건공단의 MSDS 자료와 비교하였다. 그 결과, 측정된 인화점과 최소자연발화온도는 이들과 차이를 나타내어 안전의 목적을 위해 연소특성치 고찰이 필요함을 알 수 있었다. In order to investigate the compatibility of data in MSDS(Material Safety Data Sheet), the flash point of xylene isomer was measured by using Pensky-Martens closed cup (ASTM D93), Setaflash closed cup(ASTM D3278), Tag open cup(ASTM D1310), and Cleveland open cup (ASTM D92) testers. Also, the AITs(autoignition temperatures) of xylene isomers were measured by using ASTM E659-78 tester. The measured the flash points and the AITs were compared with literatures and MSDS in KOSHA(Korea Occupational Safety and Health Agency). The measured the flash points and the AITs were different from those in literatures and MSDS. As a result, this paper is shown that it is needed to investigate combustion characteristics of xylene isomer for the fire safety objectives.
하동명(Dong-Myeong Ha) 한국가스학회 2011 한국가스학회지 Vol.15 No.2
사이클로헥산의 안전한 취급을 위해서 25℃에서 폭발한계와 폭발한계 온도의존성 그리고 하부인화점을 고찰하였다. 또한 발화지연시간에 의한 발화온도를 측정하였다. 공정의 안전을 위해서 노말헵탄의 폭발하한계는 1.0 Vol%, 상한계는 9.0 Vol%를 추천하였고, 하부인화점은 -20℃를 추천하였다. ASTM E659-78 장치를 사용하여 발화온도와 발화지연시간을 측정하였고, 여기서 측정된 최소자연발화온도는 255℃였다. 그리고 노말헵탄의 새로운 폭발한계 온도의존식을 제시하였으며, 제시된 식은 문헌값과 일치하였다. For the safe handling of cyclohexane, the explosion limit at 25℃ and the temperature dependence of the explosion limits were investigated. Flash point and AIT(autoignition temperature) for cyclohexane were experimented. By using the literatures data, the lower and upper explosion limits of cyclohexane recommended 1.0 Vol% and 9.0 Vol%, respectively. Moreover lower flash points of cyclohexane recommended -20℃. It was measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for cyclohexane, and the experimental AIT was 255℃. The new equations for predicting the temperature dependence of the explosion limits of cyclohexane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.