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무전해 도금법에 의한 흑연 - 동 복합 분말 제조에 관한 연구
이진영,한춘,주재백,오종기 ( Jin Young Lee,Choon Han,Jae Baek Ju,Jong Ki Oh ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.1
The possibility of manufacturing the graphite-copper composite powder by the electroless plating method as well as effects of related variables on the deposition process have been examined. For the continuous coating of the copper layer, the activation of the surface of graphite particle was necessary and at least one minute of activation time was needed. Although initial concentrations of copper ions were found important on the initial reaction rate, they gave the same conversion at the final stage. Since the uniform coating could be achieved when the initial concentration of copper ion was higher than 0.25 M/l, the thickness of copper layer could be controlled with the initial concentrations of copper ions. As the size of graphite particles became smaller, the amount of deposition was increased due to the larger surface area and active sites for the reduction of copper ions. Although the reaction occurred in the solution with the stoichiometric amounts of reactants, it could be accomplished with only a small amount of K-Na tartrate because of its repetitive participations during the reaction. An empirical equation was developed for the understanding and prediction of reaction rates, which gave the satisfactory results compared with the experimental data.
재생연 제련 부산물인 황산연으로부터 정제 질산연의 제조
이진영,한춘,신중극,김성규,이화영,오종기,Lee, Jin-Young,Han, Choon,Shin, Joong-Kuk,Kim, Saung-Gyu,Lee, Hwa-Young,Oh, Jong-Kee 한국자원리싸이클링학회 1998 資源 리싸이클링 Vol.7 No.2
2차납 제련공정에서 발생한 주성분이 황산납인 연진으로부터 고부가가치제품인 정제 질산납을 생산하는 습식공정을 개발하였다. 본 공정은 탄산염에 의한 탄산화 공정과 저농도 질산용액을 이용한 침출공정 및 정제 공정으로 구성되어 있으며 본 공정을 통하여 99%이상의 순도를 가진 질산납을 제조할 수 있었다. Hydrometallugical process was developed to produce the purified lead nitrate from lead dust mainly composed of lead s sulfate generated from lead-acid battery smelter as by-product. This process consisLed of carbonation process with carbonate s salts, leaching and purification processes. FmaJJy crude lead nitrate purified to produce high-purity product with over 99% Pb $(NO_3)_2$.
공비증류에 의한 MEK - 물 - 톨루엔 혼합물로부터 MEK 분리에 관한 이론적 연구
김형규,김성훈,한춘,나병기,정연수,송형근 ( Hyung Kyu Kim,Sung Hoon Kim,Choon Han,Byung Ki Na,Yon Soo Chung,Hyung Keun Song ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
MEK(methyl ethyl ketone) can be separated from MEK-Water-Toluene azeotropic mixture by azeotropic distillation using the selectivity of entrainer. Acetone was selected as the best entrainer by comparing the ratio between infinite dilute activity-coefficients. Depending on the added amount of acetone and the concentration of MEK-Water-Toluene mixture, the presence of two phase was identified by UNIFAC model. When acetone was added more than 3.14 times the amount of MEK-Water-Toluene mixture, the mixture formed a single phase and the azeotropic point was eliminated. The optimum amount of entrainer to minimize the plate number was calculated through the simulation of distillation process by UNIQUAC equilibrium model. The number of ideal plates increased with MEK composition and was independent of water and toluene composition. Also, the optimum feed-plate location was calculated at each reflux ratio for various amounts of entrainer, and the minimum reflux ratio was identified as 0.6. For the case that brought Acetone-Water as bottom product and MEK-Toluene as distillate from MEK-Water-Toluene mixture where the composition of MEK, water and toluene compositions was 40, 30, 30 mole%, respectively, 14 ideal plates were required for the best results when the reflux ratio was 0.9 and the ratio of entrainer to feed was 5. The bottom product was composed of 56 mole% of MEK and 44 mole% of toluene and the optimum feed-plate was located between the sixth and the eleventh in this case.
생활폐기물(生活廢棄物) 소각(燒却)바닥재의 재활용(再活用)을 위한 연구(硏究)
안지환,오명환,한춘,Ahn, Ji-Whan,Oh, Myung-Hwan,Han, Choon 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.1
국내의 생활폐기물의 처리 방법은 매립에서 소각으로 이동해 가고 있으며 이를 통하여 발생되는 소각재의 처리에 대한 비중이 점차적으로 증가하고 있다. 소각재는 90%가 바닥재로 존재하며, 바닥재는 재활용 가능한 성분을 함유하고 있기 때문에 재활용을 위한 활발한 연구가 필요하다. 예를 들어 미국과 유럽 그리고 일본의 경우 여러 분야에서 바닥재의 재활용이 이루어지고 있으며 이에 따른 환경적 경제적 효과를 얻고 있다. 하지만 이와 대조적으로 국내의 경우 소각재 관리 처리 시 대부분 매립에 의해 의존하고 있는 실정이다. 따라서 소각재의 발생특성과 성상을 조사 분석하고, 국내외의 소각재 안정화 및 재활용기술에 대한 기술조사와 평가를 기반으로 한 처리방안에 대한 연구가 절실히 요구된다. The treatment of domestic municipal solid waste has inclined to incineration process instead of disposal in landfills. So, the amount of ash generated by incineration of municipal solid waste is gradually increased. The incineration ash divides into bottom ash and fly ash. The bottom ash which accounts for about 90% of the incineration ash consists of ceramics, glasses and metals. And it can be used as the recycling product by the stabilization process. For example, the bottom ash is used as secondary building material or for other similar purposes such as road sub-bases and noise barrier in USA, Europe and Japan. But, the stabilization-treatment technique of bottom ash sti11leaves much to be desired in Korea. Thus, the domestic study of recycling about bottom ash must be improved through investigation about the chemical property and technique of stabilization.
MEK - 물 공비 혼합물의 공비증류에 관한 이론적 연구
김형규,이정석,한춘,나병기,정연수,송형근 ( Hyung Kyu Kim,Jung Seok Yi,Choon Han,Byung Ki Na,Yon Soo Chung,Hyung Keun Song ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.2
MEK(methyl ethyl ketone) cannot be separated from water by normal distillation because of the presence of minimum boiling azeotrope. However it can be separated by azeotropic distillation by adding entrainer. The best entrainer was selected by considering the ratio between infinite dilute activity coefficients of each component for suggested entrainers and relative volatilities. From this method, acetone was selected as the best entrainer for the MEK-Water system. When the distillation tower was simulated by the UNIFAC equilibrium model for this MEK-Water-Acetone system, the minimum reflux ratio was observed as 0.6. Also, the optimum feed-plate was calculated at each reflux ratio for various amounts of entrainer. Results indicated the number of ideal plates decreases with the amount of entrainer. As the best results, 13 ideal plates were required to obtain 95 mole% of MEK as the bottom product from 70 mole% of MEK of the MEK-Water solution when the reflux ratio and the ratio of entrainer to feed were 0.85 and 2, respectively. In this case, the optimum feed-plate location, which required the minimum number of ideal plates, was the eighth.
정대희,이진영,정태진,한춘,Jeong, Dae-Heui,Lee, Jin-Young,Jeong, Tae-Jin,Han, Choon 한국에너지학회 1998 에너지공학 Vol.7 No.1
본 연구에서는 순간 고온식 tubing-bomb reactor를 사용하여 Alaska산 아역청탄과 폴리프로필렌(PP)의 공동액화시 상승효과 및 특성을 분석하고자 하였다. 석탄과 PP의 조성 및 수소공여용매의 양을 변화시켜가며 공동액화시와 각 물질의 단독액화를 비교시 상당한 상승효과를 파악할 수 있었다. 즉, 43$0^{\circ}C$ 및 45$0^{\circ}C$에서 30분간(석탄 2g+PP 2g)을 tetralin 4ml와 함께 공동액화시 단독액화에 비해 각각 20.0, 11.6%의 상승효과를 가져왔다. 한편, GC 분석 결과 PP액화시 tetralin으로부터 수소공여가 이루어지지 않은 것으로 밝혀졌으며 석탄 단위질량액화시 tetralin의 naphthalene으로 전환량은 0.70~0.83으로 나타났다. 또한 decalin 추출로 공동액화시 석탄과 PP 각각의 전환율을 구하여 석탄 또는 PP 단독액화시의 액화율과 비교한 결과, 43$0^{\circ}C$에서 석탄혼합물 대 tetralin의 비가 1:1인 조건에서 20% 상승효과는 PP의 액화율 상승이 주도한 것으로 나타났으며 석탄이 PP분해시 촉매 효과를 나타내는 것으로 해석되었다. Synergistic effect and characteristics of coliquefaction with Alaskan subbituminous coal and polypropylene (PP) were investigated in a tubing-bomb reactor. Coliquefaction results showed considerable synergistic effect on conversions for various coal/PP compositions and tetralin addition. Therefore, coliquefactions conversions at 430$^{\circ}$C and 450$^{\circ}$C with (coal 2 g+PP 2g) and 4 ml tetralin appeared 20.0 and 11.6 per cent higher respectively compared to the conversion of (coal+tetralin) and (PP+tetralin) liquefactions. According to gas chromatographic analyses, hydrogen was not needed during PP liquefactions. On the other hand, 0.70~0.83 part of tetralin per part of coal was converted into naphthalene by donoring hydrogen to free radicals during liquefaction. Also, extraction results by decalin proved that synergistic effect of coliquefaction were mainly due to PP decomposition catalysed be coal.
CaCO<sub>3</sub> 첨가법에 따른 재생 ONP의 특성변화
안영준,남성영,엄남일,안지환,한춘,Ahn, Young-Jun,Nam, Seong-Young,Um, Nam-Il,Ahn, Ji-Whan,Han, Choon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.2
In order to improve the refresh rate of old newspaper(ONP), PCC shape-controlling experiments were carried out. The effect of a PCC polymorph on improving the quality of old newspaper was studied for a transformation from waste paper to eco-friendly paper. The synthesis of PCC consists of an in-situ process and a loading process to enhance the refresh rate of old newspaper. The characteristics between the in-situ process and the loading process could be analysed by SEM analyses of coated fiber surfaces. The retention rate ranges from 65 to 67% after the application of the in-situ process, and that after the loading process ranges from 55 to 58%. The retention rates thus show a difference of about 7-10%. In addition, the whiteness and ERIC characteristics of the in-situ process gave more efficient results than those of the loading process.