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전치완 ( Chi Wan Jeon ),채수천 ( Soo Chun Choi ),방준환 ( Jun Hwan Bang ),송경선 ( Sung Woo Lee ),장영남 ( Young Nam Jang ) 한국공업화학회 2012 응용화학 Vol.16 No.1
대기로 방출되는 황을 제거하기 위한 목적으로 사용되는 석고로부터 얻어지는 탈황석고를 원료로하여 암모니아와의 탄산화 반응과정을 거쳐 얻어지는 탄산칼슘 미분체를 이용한 표면개질 특성을 파악하였다. 유기용매에 지방산을 녹여 탄산칼슘 미분체에 비극성 지방산 그룹을 코팅시켜 표면 개질된 탄산칼슘 분체들의 물리 화학적 특성을 조사하였으며, 분체의 표면 특성을 평가하기 위한 다양한 분석법 적용을 통해 얻어진 분체 표면의 개질화 용이성, 개질된 탄산칼슘 분체의 유용성 증대 등에 대하여 논하였다
집섬과정에서 생성된 황산암모늄 용액의 침전 및 결정화에 대한 고찰
전치완 ( Chi Wan Jeon ),채수천 ( Soo Chun Choi ),방준환 ( Jun Hwan Bang ),이승우 ( Sung Woo Lee ),장영남 ( Young Nam Jang ) 한국공업화학회 2010 응용화학 Vol.14 No.2
A method for the manufacture of ammonium sulfate is known which consist of the reaction of solid calcium sulfate with an aqueous solution of ammonium carbonate to give ammonium sulfate as product. The ammonium sulfate recovered as an aqueous solution, from which the ammonium sulfate can be obtained in the form of crystal by evaporation. This study deals with the design and operation of cooling and evaporation crystallizers and precipitators for reaction crystallization. The median crystal size of and the crystal size distribution of ammonium sulfate mainly depend on the crystallization kinetics and that these kinetics are controlled by supersaturation. Therefore, the main objective in crystallization and precipitation is to choose and to maintain the optimal supersaturation with respect to product quality at all times and all locations in the crystallizer
전치완 ( Chi Wan Jeon ),채수천 ( Soo Chun Choi ),방준환 ( Jun Hwan Bang ),이승우 ( Sung Woo Lee ),장영남 ( Young Nam Jang ) 한국공업화학회 2011 응용화학 Vol.15 No.1
산업부산물인 탈황석고를 이산화탄소를 포집하기 위한 목적으로 암모니아 기류 하에서 이산화탄소와 반응시키면 탄산화 과정을 거쳐 생성물로 황산암모늄 및 탄산칼슘이 얻어진다. 황산암모늄은 물에 대한 용해도가 높고 건조가 용이하지 않으므로 제품화 가치를 향상시키기 위해서는 결정화 효율 증대, 결정체의 크기 및 형태의 개선 등이 요구되며, 탄산칼슘은 미립화, 침강성 산처리 등을 통한 고기능성 물질로 기질을 개선하여 보다 고부가가치 제품으로 개선할 필요가 있다. 본 연구에서는 이러한 석고 반응에서 반응 원료물질 및 반응 조건 변화에 따른 반응성을 고찰하였고 황산암모늄의 결정화에 미치는 제요인과 황산암모늄 제품의 품질 평가를 위한 분석 방법들과 광물탄산화 효율에 대한 평가에 대하여 논하였다.
김명선 ( Myung Seon Kim ),채수천 ( Soo Cheon Chae ),안승원 ( Seoung Won Ann ),최원춘 ( Won Chun Choi ),이명원 ( Myung Won Lee ),이국한 ( Kook Han Lee ),류효명 ( Xiao Ming Liu ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.5
White light and compound light were found to be the ideal light sources for improving the functionality and ornamental value of indoor plants and reducing the cost of maintenance, but because compound light hinders people from recognizing the original color of plants and makes their eyes easily tired, white light was considered the optimal light satisfying all of the ornamental value, economic efficiency and functionality resulting from plant growth. On the other hand, in the results of examining physiological changes before and after treatment on fine dust PM10 and carbon dioxide removal capacity in a closed chamber under an artificial light source, the patterns of carbon dioxide and fine dust removal were similar among the treatment groups according to light condition, but according to plant type, the removal rate per unit leaf area was highest in Spathiphyllum and lowest in Dieffenbachia. In the experiment on dust and carbon dioxide removal, the photosynthetic rate was over 2 times higher after the treatment, and the rate increased particularly markedly under compound light and white light, suggesting that the photosynthetic rate of plants increases differently according to light quality. These results show that light quality has a significant effect on the photosynthetic rate of plants, and suggests that plants with a high photosynthetic rate also have a high carbon dioxide and dust removal capacity. In conclusion, the photosynthetic rate of foliage plants increased under white and blue light that affect photosynthesis and the increased photosynthetic rate reduced carbon dioxide and fine dust, and therefore white and compound light were found to be the optimal light sources most functional and economically efficient in improving ornamental value and indoor air quality.
전치완 ( Chi Wan Jeon ),채수천 ( Soo Chun Choi ),방준환 ( Jun Hwan Bang ),이승우 ( Sung Woo Lee ),장영남 ( Young Nam Jang ) 한국공업화학회 2011 응용화학 Vol.15 No.1
As specific method, hydrocarbon fingerprinting has received impetus from the merging of important environmental events with the improvements in analytical and related technologies. The Hebei spilled oil residues at Taean seashore was investigated with biomarker fingerprinting and target ion tracking the compounds group, such as PAHs, PASHs and isoprenoids. Those methods for specific analyses of target markers and evaluation the diagnostic ratios of characteristic oil constituents were represented. The spilled oil residues collected from the polluted area periods of 5 months. Compositional changes of spilled oil were traced and the fate of spilled oil was elucidated such as selectivity of various weathering processes, practical depleted amount, detailed qualitative and quantitative examination of source characteristics. Investigations were focused on the biomarkers fingerprinting, oil geochemical data interpretation, characterization of spilled oil residual and application to the environmental forensic discussion including the protocol for the identification specific compound or compounds group. Obtained results were well adopted to explain the real contaminated level of spilled oils and alteration of chemical compositions caused by whether physical weathering or biodegradation.