• Title/Summary/Keyword: n-dodecane

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Isothermal vapor-liquid equilibria of n-Dodecane-1-Decanol, n-Dodecane-1 -Dodecanol and 1-Decanol-1-Dodecanol systems by Head Space Analysis (Head Space Analysis에 의한 n-Dodecane-1-Decanol, n-Dodecane-1- Dodecanol과 1-Decanol-1-Dodecanol계의 등온 기액 평형)

  • Park, So-Jin;Kang, Yong;Lee, Tae-Jong;Choi, Myoung-Jai;Lee, Kyu-Wan
    • Journal of Energy Engineering
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    • v.2 no.2
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    • pp.225-230
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    • 1993
  • Isothermal vapor-liquid equilibrium data have been measured for binary systems n-dodecane-1-defanol, n-doderane-1-dodecanol, and 1-decanoi-1-dodecanol at 140$^{\circ}C$ by using head space gas chromatography (H.S.G.C) as a static method. The activity coefficients, calculated taking into acount the nonideality of the liquid phase, were correlated with the conventional g$\^$E/ model, Margules, van Laar, Wilson, NRTL equations. These equilibrium data were thermodynamically consistent by Rrdlich- kister test, among these data, system n-dodecane-1-detanoi has minimum azeotrope.

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Breakup and Ignition Observation of n-Dodecane Emulsion Single Droplet using Two Pulse Lasers (독립된 두 레이저를 이용한 n-Dodecane 에멀전 단일 액적의 분열 및 점화 현상의 관찰)

  • Jang, Gyu Min;Jung, Yongjin;Lee, Min Jung;Kim, Nam Il
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.213-214
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    • 2015
  • Breakup and ignition of single droplet were experimentally investigated using two independent Nd-YAG lasers. The emulsified fuel was made from n-dodecane and water while varying the relative volumetric fraction. As a result of visualization, breakup and ignition behaviors were dependent on the fraction. Luminosity from the secondary droplets increased as the water fraction decreased. Ignition did not occur below 80% of the n-dodecane fraction.

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Flash Point Calculation for n-Octane+n-Decane and n-Octane+n-Dodecane by UNIFAC Group Contribution Model (UNIFAC 그룹 기여 모델에 의한 n-Octnae+n-Decane 계와 n-Octane+n-Dodecane 계의 인화점 계산)

  • Ha, Dong-Myeong;Lee, Sungjin
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.86-91
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    • 2015
  • 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.

The Investigation of Combustible Hazard by Measurement of Flash Point and Autoignition Temperature of n-Dodecane (노말도데칸의 인화점과 최소발화온도 측정에 의한 연소위험성 고찰)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.25 no.2
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    • pp.120-125
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    • 2011
  • 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 $77^{\circ}$ and $80^{\circ}C$. The lower flash points of n-dodecane by using open cup tester were experimented $84^{\circ}C$ and $87^{\circ}C$. 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 $222^{\circ}C$.

Enhancement of Hyaluronic Acid Production by Batch Culture of Streptococcus zooepidemicus via the addition of n-Dodecane as an Oxygen Vector

  • Liu, Long;Yang, Haiquan;Zhang, Dongxu;Du, Guocheng;Chen, Jian;Wang, Miao;Sun, Jun
    • Journal of Microbiology and Biotechnology
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    • v.19 no.6
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    • pp.596-603
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    • 2009
  • This study aimed to examine the influence of adding an oxygen vector, n-dodecane, on hyaluronic acid (HA) production by batch culture of Streptococcus zooepidemicus. Owing to the high viscosity of culture broth, microbial HA production during 8-16 h was limited by the oxygen transfer coefficient $K_La$, which could be enhanced by adding n-dodecane. With the addition of n-dodecane to the culture medium to a final concentration of 5% (v/v), the average value of $K_La$ during 8-16 h was increased to $36{\pm}2h^{-1}$, which was 3.6 times that of the control without n-dodecane addition. With the increased $K_La$ and dissolved oxygen (DO) by adding 5% (v/v) of n-dodecane, a 30% increase of HA production was observed compared with the control. Furthermore, the comparison of the oxygen mass transfer in the absence and presence of n-dodecane was conducted with two proposed mathematical models. The use of n-dodecane as an oxygen vector, as described in this paper, provides an efficient alternative for the optimization of other aerobic biopolymer productions, where $K_La$ is usually a limiting factor.

Measurement of Lower Flash Point for Ternary Mixture, n-Nonane+n-Decane+n-Dodecane System (삼성분계 혼합물인 n-Nonane+n-Decane+n-Dodecane 계의 하부인화점 측정)

  • Ha, Dong-Myeong;Lee, Sungjin
    • Journal of the Korean Institute of Gas
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    • v.20 no.6
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    • pp.31-36
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    • 2016
  • 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 Raoult's law and empirical equation. The calculated data by empirical equation described the measured values more effectively than those calculated by Raoult's law.

Isobaric vapor-liquid equilibria for ternary and each corresponding binaries of the system n.Dodecane-1.Decanol-1.Dodecanol at 15 mbar (n.Dodecane-1.Decanol-1.Dodecanol 삼성분계 및 각 이성분계의 15 mbar 정합 기액평형)

  • 박소진;이태종
    • Journal of Energy Engineering
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    • v.2 no.3
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    • pp.308-314
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    • 1993
  • Both Vapor-liquid equilibrium data and boiling temperature have been measured for ternary and each corresponding binaries of n.dodecane-1.decanol-1.dodecanol mixture under constant pressure of 15 mbar. Measured vapor-liquid equilibrium data were correlated with the conventional g$\^$E/ model ; Margules, van Laar, Wilson, NRTL and UNIQUAC equations. Binary equilibrium data were thermodynamically tested by Redlich-Kister integral method and ternary data were also qualitatively checked by two point consistency test, suggested by McDermott-Ellis. Among the binary VLE data, only the system n.dodecane-1.decanol has minimum boiling azeotrope.

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Ignition Characteristics of n-Dodecane Fuel Droplet on a Hot Surface (n-Dodecane 연료의 고온면 점화특성)

  • Kim, Sung-Chan
    • Fire Science and Engineering
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    • v.24 no.1
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    • pp.116-121
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    • 2010
  • The present study has been performed to investigate the ignition characteristics of a n-dodecane fuel droplet on the hot surface. Simplified bench scale test setup was built to examine the effect of air flow on the ignition temperature of fuel droplet. IR pyrometric sensor was used to measure the surface temperature, the measured temperature using IR pyrometer was directly compared with k-type thermocouple. The ignition of n-dodecane fuel droplet was divided into two stage - cool flame and hot flame - with the air flow rate except the case of air flow rate 3.0 lpm. The ignition temperature and probability was greatly affected by the air flow rate and the MHSIT of the present study was about $300^{\circ}C$ for air flow rate of 0.5 lpm.