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마이크로에멀젼에서 리파아제 촉매에 의한 고급지방산 모노글리세리드의 생성에 있어 최적효과
노윤찬,남기대,김진탁,조경행 ( Yoon Chan Ro,Ki Dae Nam,Jin Tak Kim,Kyung Haeng Jo ) 한국공업화학회 1994 공업화학 Vol.5 No.2
N/A Mono alkyl glycerides have bean obtained in good yield by enzyme catalyst from soybean oil. The reaction was carried out in an oil rich microemulsion formula. Best results were obtained with sodium bis(2-ethyl hexyl) sulfo succinate(AOT), isooctane as hydrocarbon component and buffer of pH 7. The enzyme used was a 1, 3-specific lipase which leaves the 2-position intact. However, the 2-monoglyceride formed slowly undergoes long chain acyl migration to 1-mono-glyceride. Optimal reaction time at 35℃ reaction temperature was found to be three hour.
노윤찬,정태영,조경행,노승호,남기대 ( Yoon Chan Ro,Tae Young Jeong,Kyoung Haeng Cho,Seung Ho Roh,Ki Dae Nam ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
Ground Calcium Carbonate, among paper coating pigments, will influence less dispersant demand, less binder demand, increase coating solids from 58% to 70%, which means high speed coating, less shrinkage during drying, less energy consumption, more uniform coverage of fibers. The quality point of view of Ground Calcium Carbonate, brightness particle size, Particle size distribution, harness, impurities content are important. More important factors of Ground Calcium Carbonate which influence the paper coating process are dispersion mechanisms and their effects. The study was made to investigate the effect of Ground Calcium Carbonate dispersion by sodium salt of polyacrylate dispersant composition and dispersion condition. Basic tests such as physical, optical and chemical were perfumed, and dispersion effects were investigated by different conditions. The results showed that the type of dispersant affected the dispersion effects, and the Ground Calcium Carbonate has critical dispersant demand.
파라메톡시페놀 및 히이드로퀴논 발수의 전기화학적 처리에 관한 연구
남기대,정노희,김홍수,노윤찬 한국유화학회 1991 한국응용과학기술학회지 Vol.8 No.2
The electrochemical oxidation of p-methoxyphenol and hydroquinone for wastewater treatment application was investigated on platinum anode. At the cyclic voltammetry, it was observed that nagative shift of peak potential of p-methoxyphenol and hydroqinone as the pH of electrolytes increases and the peak current showed higher at strong electrolytes than weak electrolytes. In the case of p-methoxyphenol, the optimum electrode potential of controlled potential electrolysis was observed at the potential region of 0.8-1.0 (V vs. SCE) and hydroquinone was showed at the potential of 1.0(V vs. SCE). Specially the oxidation rate of p-methoxyphenol and hydroquinone was showed high value in the acid electrolytes.