• Bulletin of the Korean Chemical Society
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• 제32권8호
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• pp.2805-2808
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• 2011

• 대한화학회지
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• 제25권2호
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• pp.124-126
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• 1981

• Bulletin of the Korean Chemical Society
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• 제30권8호
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• pp.1887-1890
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• 2009

• 대한화학회지
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• 제36권3호
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• pp.472-474
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• 1992

• Bulletin of the Korean Chemical Society
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• 제32권10호
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• pp.3783-3786
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• 2011

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1990년도 제2차 학술발표초록집
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• pp.49-49
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• 1990

• Bulletin of the Korean Chemical Society
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• 제13권4호
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• pp.441-444
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• 1992

• Bulletin of the Korean Chemical Society
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• 제31권7호
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• pp.1988-1992
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• 2010

4-Amino-1,2,4-triazole copper complex (4-ATzCu) was synthesized, and its thermal behaviors, nonisothermal decomposition reaction kinetics were studied by DSC and TG-DTG techniques. The thermal decomposition reaction kinetic equation was obtained as: $d\alpha$ / dt =$10^{22.01}$ (1-$\alpha$)[-ln(1-$\alpha$)]$^{1/3}$ exp($-2.75\times10^4$ /T). The standard mole specific heat capacity of the complex was determined and the standard molar heat capacity is 305.66 $J{\cdot}mol^{-1}{\cdot}K^{-1}$ at 298.15 K. The entropy of activation $({\Delta}S^{\neq})$, enthalpy of activation $({\Delta}H^{\neq})$, and Gibbs free energy of activation $({\Delta}G^{\neq})$ are calculated as 171.88 $J{\cdot}mol^{-1}{\cdot}K^{-1}$ 225.81 $kJ{\cdot}mol^{-1}$ and 141.18 $kJ{\cdot}mol^{-1}$, and the adiabatic time-to-explosion of the complex was obtained as 389.20 s.

• Korean Chemical Engineering Research
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• 제53권2호
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• pp.253-261
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• 2015

DMT(dimethylterephthalate)와 DEG(diethylene glycol)의 에스테르 교환반응을 통하여 BHEET(bis-hydroxyethoxyethyl-terephthalate)을 생성하는 반응에 대하여 조사하였다. BHEET는 polyurethanr foam의 원료인 폴리에스터 폴리올의 단량체이다. DMT를 이용한 기존의 에스테르 교환 반응은 반응 중 생성 MeOH이 제거되는 반회분식 반응기를 사용하였다. 따라서 이러한 kinetics 연구에서는 역반응이 고려되지 않는다. 본 실험에서는 촉매로는 zinc acetate를 사용하였고, 소형 회분식 반응기를 통하여 DMT와 MeOH의 양을 정량하여 생성되는 MHEET와 BHEET를 추정하였다. 이 반응들에서 역반응을 고려한 보다 정확한 반응 kinetics를 조사하였다. 제안된 모델의 예측 값들이 실험값들과 잘 일치함을 보였다.

• Korean Chemical Engineering Research
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• 제55권4호
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• pp.574-577
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• 2017

In Indonesia, vetiver oil is one commodity that plays an important role in the country's foreign exchange earnings. Currently, the extraction of essential oil from vetiver still uses conventional methods. Therefore, the aim of this study was to know and verify the kinetics and mechanism of microwave hydrodistillation of vetiver based on two models. In this study, microwave hydrodistillation was used to extract essential oils from vetiver. The extraction was carried out in nine extraction cycles of 20 min to 3 hours. The rate constant, the equilibrium extraction capacity, and the initial extraction rate were calculated using the two models. Kinetics of oil extraction from vetiver by microwave hydrodistillation proved that the extraction process was based on the second-order extraction model. The second-order model was satisfactorily applied, with high coefficients of correlation ($R^2=0.9427$), showing that it well described the process.