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비이온성 계면활성제의 합성에 관한 연구 (제3보). 슈크로오스에스테르의 합성에 관한 동력학적 고찰
남기대,손주환,Ki Dae Nam,Joo Hwan Sohn 대한화학회 1981 대한화학회지 Vol.25 No.4
The reaction rates for the transesterification reaction were measured on the excess sucrose with the five fatty acid methyl ester systems such as methyl laurate, methyl myristate, methyl palmitate, methyl stearate and methyl oleate at temperature range of $50^{\circ}C$ to $90^{\circ}C$ in N,N-dimethylformamide solvent and potassium carbonate as a catalyst. Their activation parameters as well as rate constants were calculated from these measurements. And these reactions were found to be pseudo-first order and depended mainly on the structural changes in fatty acid residue of methyl esters. Also their reactions were found to be of enthalpy-controlled, which were disfavored in the order of methyl laurate, methyl myristate, methyl palmitate, methyl oleate and methyl stearate. Correspondingly their activation energies were 9.3, 9.9, 10.3, 10.9 and 11.1 kcal/mole, respectively. N,N-디메틸포름아미드용매내 반응온도 50∼$90^{\circ}C$범위에서 과량의 슈크로오스와 라우르산, 미리스트산, 팔미트산, 스테아르산 그리고 올레산등 5종의 지방산 메틸에스테르와의 에스테르 교환반응에서 반응속도를 측정하여 반응속도정수, 활성화파라미터등을 구하여 고찰하였다. 이 반응은 본 실험범위내에서 유사 1차반응으로 진행하고 반응의 순서는 주로 메틸에스테르의 지방산기의 구조변화에 의존하면 라우르산메틸, 미리스트산메틸, 팔미트산메틸 올레산메틸 그리고 스테아르산 메틸의 순으로 반응되기 힘들어지는 엔탈피조절반응이라 생각된다. 한편 이들 각각의 활성화에너지는 9.3, 9.9, 10.3, 10.9 그리고 11.1 kcal/mole이 얻어졌다.
남기대,정노희,노승호,Nam, Ki-Dae,Jeong, No-Hee,No, Sueng-Ho 한국응용과학기술학회 1989 한국응용과학기술학회지 Vol.6 No.2
Allyl aliphatic carboxylates were synthesized by azotropic reaction with benzene between allyl alcohol and capric acid, lauric acid, myristic acid, palmitic acid or stearic acid respectively. allyl aliphatic carboxylates oligomers were prepared from polymerization giving allyl aliphatic carvboxylates in the presence of potassium persulfate in methanol, and the ${\alpha}-sulfonation$ of these five allyl aliphatic carboxylates oligomers were carried by direct addition of dry sulfur trioxide. Especially, molecular weights of fatty acid alylester oligomers and their sodium salts of ${\alpha}-sulfo$ fatty acid allylester oligomers were measured by boiling point method.
백금전극에 (白金電極) 의한 하이드로퀴논의 양극 (陽極) 전해산화 (電解酸化) 특성
남기대,김홍수 ( Ki Dae Nam,Hong Soo Kim ) 충북대학교 산업과학기술연구소 1990 산업과학기술연구 논문집 Vol.4 No.2
Abstract_Roman The electrochemical oxidation behavior of hydroquinone on platinum anode had been investigated by cyclic voltammetric method for the variation af co- ncentration, scan rate of potential, temperature and pH of electrolyte. The oxidation pot
남기대,김상춘,최재효 ( Ki Dae Nam,Sang Chun Kim,Jae Hyo Choi ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
Recent studies on enzyme reactions in organic solvents are revived. The reactions are classified into three categories : heterogeneous, biphasic and homogeneous systems. The following subjects are described and discussed about the heterogeneous system. 1) The maximal expression of enzyme activity in organic solvents in terms of water content, hydration of enzyme, and equilibrium of water between enzyme and substrate solution. 2) Solvent effect on the catalytic power of enzyme. 3) Thermostability and thermoreactivity. 4) Applications of the enzyme reactions to synthetic chemistry.