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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.
삼성분계 혼합물인 n-Nonane+n-Decane+n-Dodecane 계의 하부인화점 측정
하동명(Dong-Myeong Ha),이성진(Sungjin Lee) 한국가스학회 2016 한국가스학회지 Vol.20 No.6
인화점은 액체 용액의 가장 중요한 인화성 지표 중 하나이다. 인화점은, 가연성 증기의 공기 속 농도가 점화가 발생하기에 충분할 때의 온도 중 가장 낮은 온도이다. 본 연구에서는 삼성분계 액체 용액인, n-nonane+n-decane+n-dodecane acid 계의 인화점을 Seta flash 밀폐식 장치를 사용하여 측정하였다. 실험값은 라울의 법칙을 활용한 방법과 실험식에 의한 계산값과 비교되었다. 그 결과 실험식에 의한 계산값이 라울의 법칙에 의한 계산값 보다 측정값을 잘 모사하였다. The flash point is one of the most important indicators of the flammability of liquid solutions. The flash point is the lowest temperature at which there is enough concentration of flammable vapor to form an ignitable mixture with air. In this study the flash points of ternary liquid solutions, n-nonane+n-decane+n-dodecane system, were measured using Seta flash closed cup tester. The measured values were compared with the calculated values using Raoults law and empirical equation. The calculated data by empirical equation described the measured values more effectively than those calculated by Raoults law.
노말도데칸의 인화점과 최소발화온도 측정에 의한 연소위험성 고찰
하동명 한국화재소방학회 2011 한국화재소방학회논문지 Vol.25 No.2
For the safe handling of n-dodecane, the explosion limits were investigated and the lower flash points and AITs (autoignition temperatures) by ignition delay time were experimented. By using the literatures data, the lower and upper explosion limits of n-dodecanee recommended 0.6 Vol.% and 4.7 Vol.%, respectively. The lower flash points of n-dodecane by using closed-cup tester were experimented 77℃and 80℃. The lower flash points of n-dodecane by using open cup tester were experimented 84℃ and 87℃. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-dodecane. The experimental AIT of n-dodecane was 222℃. 노말도데칸의 안전한 취급을 위해서 25에서 폭발한계를 고찰하였고, 하부인화점과 발화지연시간에 의한발화온도를 측정하였다. 공정의 안전을 위해서 노말도데칸의 폭발하한계는 0.60Vol.%, 상한계는 4.7Vol.%를 추천하였고, 하부인화점은 밀폐계에서 77℃과 80℃와 개방식에서 84~87℃로 측정되었다. ASTM E659-78 장치를 사용하여 자연발화온도와 발화지연시간을 측정하였고, 최소자연발화온도는 222℃ 측정되었다.
이태호,문성용,김성현,이기봉 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Analyzing the products obtained from the catalytic reaction of jet fuels is challenging because the fuelsconsist of several components. It is crucial to select suitable model compounds as representatives of thefuel to study its catalytic reaction, and methylcyclohexane (MCH) and n-dodecane were selectedconsequently. Further, the change in the products obtained from the reaction (catalyzed by commercialHZSM-5 in aflow reactor under a supercritical condition (550 C and 5 MPa)) was investigated by varyingthe ratios of MCH and n-dodecane in the blended fuels. Although the fuel conversion and gas yield wereproportional to the n-dodecane fraction in the fuel, the yield of aromatic compounds at each time, whichwas relative to the yield at the initial time, did not indicate any relation with it. The relative yields of thearomatic hydrocarbons obtained from the blended fuel reduced much slower than those obtained fromthe pure fuels. Particularly, the fuel containing an n-dodecane mass fraction of 0.2 exhibited the lowestreduction rate regarding the relative yields of aromatic hydrocarbons. The change in the relative yields ofthe products regarding the fuels was not crucial to coke formation.
초임계 조건에서 질량 유량 변화에 따른 원통관내 n-dodecane의 열분해 반응에 관한 수치적 연구
이승혁(Seunghyeok Lee),왕위엔강(Yuangang Wang),손채훈(Chae Hoon Sohn) 한국연소학회 2021 한국연소학회지 Vol.26 No.4
Numerical simulation on thermal decomposition reaction of n-dodecane in a cylindrical tube is conducted by changing mass flow rate. Thermal decomposition mechanism adopted in the present study is the proportional product distribution (PPD) model for n-dodecane, which is a 1-step global mechanism. All of simulations are performed atr the same temperature of 665 K and pressure of 3 MPa with the wall heated at 580 W. The mass flow rate of n-dodecane increases from 3 to 4 kg/h. In addition, numerical simulations with kinetics mechanisms with and without pyrolysis are conducted and their results of reactive flow fields are compared with each other. The physical properties of the mixture produced by n-dodecane decomposition are evaluated along the tube. The conversion rate of the fuel and the volume of endothermic reaction decreases as the mass flow increases.
Kim, T.,Song, K.H.,Yoon, H.,Chung, J.S. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.40
<P>The steam reforming of n-dodecane over 35 wt% Ni supported on alumina (Ni-Al2O3) and yttrium-stabilized zirconia (Ni-YSZ) at 800 degrees C for 10 h with a steam-to-carbon ratio of 3 was tested in the presence and absence of 10 wt% of K2Ti2O5 (KTO) particles. The suppression of coke formation by KTO was investigated using various characterizations, including BET, TPO, TGA, TEM, and EELS. After the addition of 10 wt% of KTO particles by ball milling, Ni-YSZ exhibited stable performance with negligible coke formation at space velocities of less than 20,000 h(-1). The addition of KTO to Ni-Al2O3 did not yield any improvements because the majority of Ni particles in alumina pores are not directly in contact with the KTO phase. The dispersion of finely divided KTO particles on the surfaces of both Ni and the support effectively suppressed coke formation by steam gasification of the deposited coke into CO and H-2. First, the gradual accumulation of coke during the course of the reaction deactivated the Ni sites, which presented activity for the steam reforming of methane. The Ni and acidic sites, which were effective for the hydrogenolysis of n-dodecane to methane and ethylene (or ethane in the presence of KTO), were eventually deactivated. An overall reaction pathway was then proposed based on the results. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
김중연(Joongyeon Kim),박선희(Sun Hee Park),전병희(Byung-Hee Chun),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
극초음속 항공기 기술의 발전은 비행체 속도를 증가시키기 위해 진행되어 왔다. 하지만 비행체의 속도가 증가할수록 엔진에서 발생되는 열과 공기와의 마찰열이 증가하게 된다. 이러한 열적부하 처리를 위해 탄화수소형 흡열연료를 이용한 비행체 냉각에 대한 연구가 미국, 프랑스, 러시아 등 선진국에서 이루어지고 있다. 흡열연료(Endothermic fuels)는 열분해 또는 촉매분해와 같은 흡열반응(Endothermic reaction)을 통해 열을 흡수하는 액체 탄화수소 비행체 연료이다. 본 연구에서는 흡열연료의 모델연료로써 methylcyclohexane, n-octane, n-dodecane을 선정하여 흡열특성 연구를 진행하였다. 실험조건은 흡열연료가 사용되는 각 연료의 초임계 조건이며 온도별 분해율 분석, 열분해 생성물분석, 흡열량 계산을 수행하였다. 본 연구의 목표는 모델연료의 흡열특성을 규명함으로써 실제 비행체에 널리 사용되는 케로신 연료의 흡열특성 예측에 기여하는 것이다. Hypersonic aircraft technologies have been developed with increase in flight speeds. As hypersonic flight speeds increase, heat loads on an aircraft and it"s engine increase. Researches on cooling technologies using endothermic fuels are progressing in the USA, France, and Russia to treat the heat loads. Endothermic fuels are liquid hydrocarbon aircraft fuels which are able to absorb the heat loads by undergoing endothermic reactions, such as thermal and catalytic cracking. In this study, methylcyclohexane, n-octane, and n-dodecane were selected as model endothermic fuels and experiments in endothermic properties were implemented. Experimental conditions were supercritical phase of each model fuels in which actual endothermic fuels were exposed. The object of this study is to identify endothermic properties of the model endothermic fuels and to predict endothermic properties of actual fuels such as kerosene fuels.
김중연(Joongyeon Kim),박선희(Sun Hee Park),전병희(Byung-Hee Chun),김성현(Sung Hyun Kim),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han) 한국추진공학회 2011 한국추진공학회지 Vol.15 No.5
Researches on hypersonic aircraft technologies have been carried out to increase flight speeds. However, increase in flight speeds causes heat loads that could lead structural change of aircraft’s component. Researches on cooling technologies using endothermic fuels are progressing in the USA, France and Russia to treat the heat loads. Endothermic fuels are liquid hydrocarbon aircraft fuels which are able to absorb the heat loads by undergoing endothermic reactions, such as thermal and catalytic cracking. In this study, methylcyclohexane, n-octane, and n-dodecane were selected as model endothermic fuels and experiments in endothermic properties were implemented. Experimental conditions were supercritical condition of each model fuels in which actual endothermic fuels were exposed. The object of this study is to identify endothermic properties of the model endothermic fuels and to predict endothermic properties of actual fuels such as kerosene fuels.
n-dodecane과 수소를 환원제로 하는 은 알루미나 촉매 기반 HC-SCR에 대한 실험적 연구
하종주(Jongju Ha),전광민(Kwang Min Chun),송순호(Soonho Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study investigated the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with hydrocarbon in the presence of excess oxygen using silver alumina catalyst which are known to exhibit efficient NOx reduction at high temperatures. In this study, hydrocarbon-SCR experiment is conducted for hydrogen addition effect and hydrocarbon concentration effect.