• Title/Summary/Keyword: 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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Effect of Dodecane on the Surface Structure and the Electronic Properties of Pentacene on Modified Si (001)

  • Kim, Beom-sik;Kang, Hee Jae;Seo, Soonjoo;Park, Nam Seok
    • Applied Science and Convergence Technology
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    • v.25 no.2
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    • pp.28-31
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    • 2016
  • The structural and the electronic properties of pentacene on modified Si (001) were investigated using scanning tunneling microscopy (STM), atomic force microscopy (AFM) and ultraviolet photoelectron spectroscopy (UPS). Dodecane was used to modify Si (001) substrates and then pentacene was deposited on dodecane/Si (001). Our STM results show a uniform distribution of aggregated dodecane molecules all over the clean Si (001). The surface structure of pentacene on dodecaene/Si (001) examined by AFM is analogous to that of pentacene on $SiO_2$. The UPS data showed that the work function of pentacene on clean Si (001) and pentacene on modified Si (001) with dodecane was 6.41 and 5.57 eV, respectively. Our results prove that dodecane results in the work function difference between pentacene on clean Si (001) and pentacene on dodecane/Si (001).

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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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.

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 $222^{\circ}C$.

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.

A PRACTICAL METHOD FOR THE DISPOSAL OF RADIOACTIVE ORGANIC WASTE

  • Kim, Kil-Jeong;Shon, Jong-Sik;Ryu, Woo-Seog
    • Nuclear Engineering and Technology
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    • v.39 no.6
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    • pp.731-736
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    • 2007
  • Radioactive organic wastes containing acetone, alcohol, and particularly tributyl phosphate (TBP)/dodecane contaminated with uranium are extracted from the PUREX process and the decontamination of related equipment. An evaporation method that utilizes existing DU oxidation apparatuses and ventilation systems and a typical muffle furnace installed with an aspirating system are adopted. A separation method using phosphoric acid especially for the TBP/dodecane waste is also studied and evaluated. The results show that a simple evaporation process is utilizable for wastes containing acetone or alcohol with a lower boiling point. A modified muffle furnace is more appropriate to dispose directly of organic wastes having a higher boiling point, such as TBP/dodecane, without generating a condensed waste solution. It is recommended that, when the uranium concentration of TBP/dodecane waste is much higher than stipulated levels, separation technology should be applied to remove uranium from the mixture. Each type of solvent after separation can then be considered disposable below the regulatory limit in the modified furnace discussed in this study.

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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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.

Separation of Zirconium and Hafnium from Zirconium Oxychloride (ZOC) Synthesis of Kalimantan Zircon Sand Concentrate Using Extraction Method with tributyl phosphate (TBP)-Dodecane in Nitric Acid Medium

  • Kharistya Rozana;Ariyani Kusuma Dewi;Herry Poernomo;Won-Chun Oh;Karna Wijaya
    • Korean Journal of Materials Research
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    • v.34 no.5
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    • pp.247-253
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    • 2024
  • The separation of zirconium and hafnium using tributyl phosphate (TBP)-Dodecane extractants in nitric acid medium was performed. Zirconium oxychloride, used as extraction feed, was obtained from the synthesis of Kalimantan zircon sand concentrate smelted using NaOH. The extraction process was carried out by dissolving chloride-based metals in nitric acid media in the presence of sodium nitrate using TBP-Dodecane as an extractant. Some of the extraction parameters carried out in this study include variations in organic phase and aqueous phase (O/A), variations in contact time, and variations in nitric acid concentration. Extraction was carried out using a mechanical shaker according to the parameter conditions. X-ray fluorescence (XRF) was used for elemental (Zr and Hf) composition analysis of the aqueous solution. The results showed that zirconium was separated from hafnium at optimum conditions with an organic/aqueous ratio of 1:5, contact time of 75 min, and an HNO3 concentration of 7 M. The resulting separation factor of zirconium and hafnium using TBP-Dodecane was 14.4887.