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劉承坤,任洪彬,周赫鍾 충남대학교 1977 工業技術開發硏究所論文集 Vol.4 No.1
In the extraction of RNA from Sccharomyces cerevisiae, sodium chloride solution is regarded as the proper solvent and 5 percent is selected as the optimal concentration. The optimal temperature and time in the extraction of RNA are obtained at 65℃ for 60 minutes. The amount of solvent per unit gram of yeast is scarcely affected at more than 200ml. Yeast powder which was pretreated with hot TCA products about 10 times of RNA than yeast cake. In the case of yeast cake, the amount of RNA extracted was suddenly increased over the sterilizing temperature of yeast. Although yeast was pretreated with hot TCA, the amount of RNA extracted is only 66% of total amount of RNA by the first stage. But 93% of RNA is extracted by the continuous two stages.
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劉承坤 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.1
Gardenia contains about 20wt% of Gardenia oil. Ethyl-Ether was selected as solvent for extraction of Gardenia oil from Gardenia particles that was passed 18 mesh Tailer style screen. The amounts of Gardenia oil extracted from unit Gardenia sample was propotional to the log θ^2.5 fo extaction time (θ; 10∼240min.), the log T^15 of extraction temperature (T; 10∼30℃), and the log V^5.2 of volume of solvent (V; 10∼200ml/5g sample). The optimum extraction conditions were 120 min., 20℃ and 10ml of solvent per gr Gardenia particles. Finally, the empirical equation was derived as fallow, Y(θ.T.V)??log θ^2.5T^15V^5.2―20.5 The devition the experimental value and the one calculated from the equation in effective range is ±0.5%. The results of analysis of Gardenia oil were those that the sapoification value was 220∼240, the acid value was 65∼72, the iodine value was 46∼52 and the specific gravity was 0.925∼0.945 (25℃/25℃).
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활성탄소섬유 카트리지 휠터에 의한 수중 잔류염소의 흡 탈착 거동
유승곤,이재광,송승필 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.2
활성탄소섬유 카트리지 휠터를 제조하고 이 휠터의 수중 잔류염소 흡착 및 탈착 거동을 조사하였다. 2 ppm 잔류염소의 흡착파과곡선에서 0.2 ppm의 잔류염소농도를 파과점으로 할 때, 파과점까지 활성탄소섬유 카트리지 휠터(Activated Carbon Fiber 함량: 100 g)는 31.5 ton, 활성탄소섬유/활성탄 카트리지 휠터(Activated Carbon Fiber 함량: 50 g, Activated Carbon 함량: 50g)는 8.4 ton을 정수하였다. 카트리지 휠터에 의한 압력손실은 유량이 10ℓ/min일 경우, 활성탄소섬유 휠터의 경우는 120 ton 처리까지 0.2 ㎏_f/㎠ 미만이나, 활성탄소섬유와 활성탄을 1 : 1로 혼합하여 만든 경우는 120 ton처리까지 2.3㎏_f/㎠ 이었다. 카트리지 휠터의 탈착은 90℃의 뜨거운 물로 역세척하여 수행하였다 충분히 역세척이 이루어진 카트리지 휠터의 파과점까지의 제2차 수중 잔류염소 흡착실험으로 탈착률(재생률)을 검사하였다. 그 결과 활성탄소섬유로만 사용한 카트리지 휠터의 탈착률은 70.5%이었으나, 활성탄소섬유와 활성탄을 1 : 1로 혼합하여 만든 카트리지 휠터의 탈착률은 36.9%이었다. 활성탄소섬유 카트리지 휠터의 탈착률은 역세척수의 온도가 상승할수록 상승했으며, 활성탄이 더해짐에 따라 잔류염소 탈착률이 감소했다. Cylindrical Activated Carbon Fiber cartridge filters were prepared to investigate their adsorption/desorption behavior of residual chlorine from 2 ppm aqueous solution. From breakthrough profiles, the amount of purified water was 31.5 ton with Activated Carbon Fiber cartridge filter(Activated Carbon Fiber: 100g) while only 8.4 ton with Activated Carbon Fiber/Activated Carbon cartridge filter(Activated Carbon Fiber; 50 g, Activated Carbon: 50 g) at the breakpoint when the breakpoint was fixed to 0.2 ppm(C/C_0=0.1) residual chlorine. The pressure drop through Activated Carbon Fiber and Activated Carbon Fiber/Activated Carbon cartridge filter were 0.2 ㎏_f/㎠ and 2.3 ㎏_f/㎠, respectively, when 120 ton aqueous solution was passing the cartridges at 10ℓ/min flow rate. The desorption of chlorine from fully used cartridges was performed by reverse washing with hot water at 90 ℃. The desorption efficiency of cartridge was determined by comparison the 2nd adsorption capacity of residual chlorine with the 1st adsorption capacity at breakpoint. The desorption efficiency of Activated Carbon Fiber cartridge was 70.5% while that of Activated Carbon Fiber/Activated Carbon cartridge was 36.9%. The desorption efficiency of cartridge increased with the temperature of washing water and decreased with the amount of Activated Carbon charged in cartridge.
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劉承坤 연세대학교 대학원 1974 원우론집 Vol.2 No.1
Abstract The extraction efficiency of reddish-brown pigment from the chestnut-bur was greatly depended upon the extraction time, temperature and the amounts of solvent used. From the experimental results, the amounts of extracted pigment was logarithmically propertional to the extraction time and the amounts of solvent used for the extraction and also linearly proportional to the temperature of extraction, as the following equation which was empirically determined. Ptotal = 0.32logθ+0.485logS+0.022T-0.34 In addition to these, it wart very efficient that the sample was dried at 110℃ for 20minutes, prior to the pigment extraction. Finally, the most optimum conditions of pigment extraction were determined as 60 minutes of operation time, 60℃ of temperature and 400ml of solvent, 20% elhyl-alcohol per 1 g of the sample in the extractions.
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향류식 열교환기에 의하여 멸균된 된장의 미생물군 및 색도
유승곤,김인호,김종생,최성현,오만진,김용국,이인기 한국생물공학회 1998 KSBB Journal Vol.13 No.6
To develop a large scale countercurrent single pass heat exchanger for continuous transportation and sterilization of soybean paste, microflora and color value of sterilized soybean paste were examined at various sterile condition. Aerobes, anaerobes, molds, yeasts and lactic acid bacteria were 5.1 x 107 CFU/g, 7.1 x 107 CFU/g, 2.6 x 105 CFU/g, 4.3 x 106 CFU/g, 1.3 x 107 CFU/g, respectively in raw soybean paste. In gold band ampoule test, aerobes and anaerobes of soybean paste were viable up to 90$^{\circ}C$, but become unviable at 100$^{\circ}C$. Molds decreased rapidly and yeasts decreased slowly from 70$^{\circ}C$. Lactic acid bacteria were unviable at 60$^{\circ}C$ within 10 min. In color test, Hunter L, a, and b values of soybean paste were 50.2, +5.6, and +17.8, respectively. After heating in polyethylene film bag at 80$^{\circ}C$, Hunter values were not so much changed and become 50.2, +4.7, and +19.7, respectively. The micorflora and color of soybean paste sterilized in a large scale heat exchanger system resulted in very similar to those of gold band ampoule and polyethylene film bag by effective heat transfer.
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유승곤,고경렬,채주승,정종헌,이보성 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
석유 핏치로부터 hollow 탄소섬유를 만들고 이를 스팀으로 활성화하여 비표면적이 800-2100 ㎡/g인 새로운 타입의 흡착제, 중공활성탄소섬유(HACF)를 제조하였다. 이들의 등온흡착곡선은 모두 Type I을 보였다. 약 70%의 burn-off에서도 외부표면적은 전체표면적의 약 1.5% 미만이었고, 이것은 내부 세공부피가 대단히 큼을 보여주고 있다. HACF는 ACF와 마찬가지로 요오드 흡착이나 메틸렌블루 탈색 등 액상흡착에서 뛰어난 흡착능력을 보여 주었다. 특히 hollow ACF는 분자체와 마찬가지로 혼합물의 분리 등에 효과적으로 사용될 수 있을 것으로 전망된다. Hollow carbon fiber was prepared from petroleum pitch and activated by steam for the production of new type adsorbent. The hollow activated carbon fibers (HACF) showed 800-2100 ㎡/g of specific surface area. All the adsorption isotherms of HACFs were Type I. The external surface area of 70% burn-off HACF was only about 1.5% of total surface area, which means that the micropore volume is very large. HACFs have excellent iodine adsorption and methylene blue decolorization capacities like an ordinary activated carbon fibers in solution. Especially, it is expected that HACF can be used for the separation of various mixtures as molecular sieves.
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유승곤,송봉준,이보성 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
Water soluble components of Persicaria hydropiper have an insecticidal effect. The extraction mechanism of water solubles from Persicaria hydropiper was studied and it turned out to be a diffusion model. The diffusivity was logarithmically increased with respect to extraction temperature (20…70℃) showing the values in 0.7…2.65×10^-7 cm²/min. Some variables which have an effect on extracted quantity of water solubles were also observed. As a result, optimum operatin conditions and empirical equation were presented for the industrial scale extraction.
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