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장윤식,박동원 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.1
Due to the rising cost of energy, new separation processes based on extraction are becoming more attractive than before. Thus, the need for claculating and predicting liquid-liquid equilibria(LLE) compositions has very much increased. The purpose of this study is to determine the binodal curves, tie-lines, plait-point, distribution and selectivity for the ternary systems of acetic acid-water with methyl ethyl ketone(MEK), methyl isobutyl ketone(MBK), ethylacetate(EAc), butylacetate(BAc), toluene and o-xylene as solvents at 25℃. And those tie-line data were used to examine thermodynamic consistency. The experimental tie-line data were correlated with NRTL and UNIQUAC models.
Butyl acetate-MEK 혼합용매를 이용한 초산분리에 관한 연구
장윤식,황승순,박동원 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
We studied on the phase equilibria of quaternary liquid-liquid extraction system containing acetic acid-water-binary solvent at 25℃, MEK-butyl acetate were used as binary solvents. Binodal curve, tie-line, distribution and selectivity for each quaternary system have been determined in order to investigate the effect of using binary solvent in extracting acetic acid from aqueous solution. And these experimental tie-line data were also compared with the values predicted by WAC model. It was shown that UNIFAC model is capable of predicting the tie-line in these quaternary systems within an average RSDM of 3.76 mol%.
장윤식,이진우 동의공업대학 2000 論文集 Vol.26 No.1
We studied on the phase equilibria of quaternary liquid-liquid extraction system containing Acetic acid- Water-Binary solvent at 25℃, latm, ethyl acetate-toluene were used as binary solvents. Binodal curve, tie- line, distribution and selectivity for each quaternary system have been determined in order to investigate the effect of using binary solvent in extracting acetic acid from aqueous solution. And these experimental tie-line data were also compared with the values predicted by UNIFAC model. It was shown that UNIFAC model is capable of predicting the tie-line in these quaternary systems within an average RMSD of 0.61mole%.
이윤복,서기원,류봉기,김광호,박희찬,장윤식 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.50 No.-
카올린으로 부터 수화염기성황산알루미늄을 제조하고, 이것을 탄소열환원질화하여 질화알미늄 분말을 합성하였다. 수화염기성황산알루미늄은 카올린으로 부터 제조된 수화황산알루미나 0.5M 및 요소 5M인 용액으로 부터 얻은 것이 가장 미세하였다. 탄소열환원질화법으로 질화알미늄을 합성할 때 활성화탄과 염기성황산알루미늄의 질량비가 2인 조성이 가장 적합하였으며, 이 때 얻어진 질화알미늄은 0.3-1㎛의 submicron급 분말이었다. Aluminum nitride powder was synthesized by carbothermal reduction-nirtridation using kaolin- derived hydrated basic aluminum sulfate. The hydrated basic aluminum sulfate powder produced from the solution of 0.5M hydrated aluminum sulfate and 5M urea showed very fine particles. The aluminum nitride showed the submicron powder of 0.3-1㎛ in the optimum condition with 2.0-weight ratio of activated charcol to hydrated basic aluminum sulfate.
윤장효,염경호,김우식,김원규 연세대학교 대학원 1986 延世論叢 Vol.22 No.1
The dynamic characteristics and mass transfer effects in Para-type plate pulsed column was investigated. The axial dispersion coefficient of continuous phase was constant in the range above that continuous phase flow rate was 200ml/min, and was more influnced by amplitude than by frequency. The hold-up of continuous phase was more influnced by amplitude and saunter mean diameter was more influnced by frequency. As the experimental results of acetone extraction, the column efficiency was slightly decreased with the pulse velocity increased, but was stabilized in the range of 80~90%. The acetone concentration profiles with the change of column height at steady state more approached to the backflow model than the diffusion model.
김윤성,구본길,차종식,박장규,이영 충남대학교 의과대학 지역사회의학연구소 1984 충남의대잡지 Vol.11 No.1
Mondor's disease has been regarded as an obliterative phlebitis usually affecting superficial vein of the chest wall. It is characteristic that the cord-like thrombosed vein which is red and tender at first changes into painless fibrous band. In the past, it was confused with lymphatic spread of carcinoma but it was confirmed that it was benign and related with the systemic diseases or cancer. The authors observed a 57-year-old female with Mondor's disease. 15 days ago, she notified the cord-like lesion on the right chest well, from right axillar fold to right iliac crest. 1. month later, the skin lesion much improved without special treatment.
초산 수용액을 포함한 4성분계에서의 용제회수에 관한 연구
박동원,장윤식,최성욱,김영일,서진기 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.1
Due to the rising cost of energy, new separation processes based on extraction are becoming more attractive than before. Thus, the need for calculating and predicting liquid-liquid equilibria(LLE) compositions has very much increased. The purpose of this study is to determine and describe LLE data for the quaternary system containing acetic acid aqueous solution and solvent at 25℃. We investigated that the selection of the optimum solvent to separate acetic acid from aqueous solution and compared with ternary and quaternary LLE including binary solvent also.
아크릴로니트릴 제조공정 중 혼합용매를 이용한 아세토니트릴 회수에 관한 연구
최성욱,장윤식,박동원 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
The phase equilibria of quaternary liquid-liquid extraction system composed acetonitrile- water-o-xylene-ethylacetate mixture was investigated. The purpose of this study is to determine and describe LLE data for the quaternary system containing acetonitrile aqueous solution and solvent at 25℃. We investigated that the selection of the optimum solvent to separate acetonitrile from aqueous solution. The distribution and selectivity- for quaternary system o-xylene(l)-water(2)-acetonitrile(3)-EAc(4) are increased with addition of o-xylene. These experimental tie-line data are also compared with the values predicted by UNIFAC model. It is shown that UNIFAC model is capable of predicting the tie-line in these quaternary systems within an average root mean square deviation of 3.98 mo %.