鐵鑛石粒子內 一酸化炭素의 擴散에 關하여 : 數學的 model을 中心으로

柳慶玉 漢陽大學校 1972 論文集 Vol.6 No.-

At the reduction particle size regions under 10mmΦ in the previous works for the reduction of iron ore by the carbon monoxide, the rate-determining step was found to be the surface chemical reaction in comparison with the experimental data and theoretical equation which derives from considering the following steps such as the diffusion through the gaseous film around the ore particles, the intraparticle diffusion, and the chemical reaction, on the ore particle surface. And at the regions upper 10mmΦ, it was found that the intraparticle diffusion is play an important role. In this paper, therefore, it was derived some mathematical diffusion model and the applied problem for experimental works were considered.

폐플라스틱 고화체로부터 Co - 60 과 Cs - 137 의 침출 특성

류경옥,전관식 한국화학공학회 1983 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.21 No.1

원자력시설에서 발생되는 방사성폐이온교환수지의 폐플라스틱고화에 관한 연구로서 용출용액의 종류(증류수, 지하수, 해수), 폐수지의 함량(30wt%∼60wt%), 방사선조사선량(10^7∼10^9R)등의 관점에서 고화체로부터 방사성핵종의 용출성이 분석되었다. 40wt% 이하의 폐수지를 함유한 고화체는 비교적 혼합도가 양호하고, 압축강도는 210 Kg/㎠ 이상이었으며, 용출용액 중에서의 팽윤현상도 감지되지 않았다. 한편, 25℃의 증류수 중에 91일간 잠적시킨 30wt%의 폐수지를 함유한 고화체로부터 Co-60과 Cs-137의 용출분율은 각각 0.11과 8.3%이고, 용출율은 각각 2.02×10^(-7)과 3.6×10^(-4)g/㎠-day를 나타내어 내용출성이 양호함을 보여주고 있다. 한편 폐수지의 함량, 용출용액 중의 양이온의 함량, 온도 및 방사선조사선량의 증가와 더불어 용출성이 증가하는 경향을 지니고 있다. 따라서 폐수지를 고화시키는데 Styrene계 폐플라스틱이 고화매체로 이용하는데 적합하였다. 이때 최적 폐수지의 함량은 30wt%이었고, 이 고화체는 용출성의 관점에서 볼 때 육지처분상의 안전도를 지니고 있음을 보여 주었다. For the method developed to incorporate a radioactive waste ion exchange resin from a nuclear facility into a thermoplastic waste, the leachability of radionuclide from the solidified product has been studied as the functions of the leachants (demineralized water, ground water and sea water), temperature(25℃ and 70℃), content of waste resin(30-60wt%) and radiation exposure dose(10^7-10^9R). The specimen containing the waste resin up to 40wt% shows good homogeneoty, compressibility greater than 210kg/㎠ and no evidence of swelling in the leachants. On the other hand, the cumulative fractions of Co-60 and Cs-137 leached from a specimen in the demineralized water at 25℃ are 0.11 and 8.3%, respectively, and the leach rates are 2.02 × 10^(-7) and 3.63 × 10^(-4)g/㎠-day, respectively, during leaching time of 91 days, and then these suggests that the product has good resistence against leaching. And the leachability has a tendency to increase with the increase of the waste resin content, cation content in leachant, temperature and radiation exposure dose. The above results show that the thermoplastic waste of styrene series is applicable to solidifying the waste resin, that the optimum content of the waste resin might be 30wt% in the product and that from the viewpoint of the leachability, it should be safe to dispose the product into the ground.

Ru/α - Al2O3 촉매상에서 톨루엔의 기상수소화반응

류경옥,문세기,강신춘,원용성 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.6

小型 反應器를 이용하여 α-Al₂O₃를 담체로 한 Ru 觸媒上에서의 氣相의 톨루엔에 대한 水素化反應을 연구하였다. 反應溫度 範圍는 40-140℃이었고 톨루엔의 分壓 範圍는 49-82㎜Hg이었다. 또한 反應의 主生成物은 메틸시클로헥산(methyl-cyclohexane)이었으며 다른 副産物은 무시할 수 있을 정도로 微量이었다. 톨루엔의 轉化率은 80-100℃에서 最大이었다. 그리고 反應速度式은 分壓의 항으로 다음과 같이 표현할 수 있었으며, - dP_(To1)/dt = kPH₂P_(To1)^(-0.5) 50-60℃에서 구한 活性化에서지는 15.4㎉/㏖이었다. The vapor phase hydrogenation of toluene was studied over the ruthenium catalyst supported on alumina in a small-scale reactor. The reaction temperature was in the range of 40-140℃, and the partial pressure of toleune from 49㎜Hg to 82㎜Hg. The main product of reaction was found to be methylcyclohexane, and the other products were in negligible amounts. The maximum conversion of toluene was obtained between 80℃ and 100℃. The rate equation an terms of partial pressure could be expressed as - dP_(To1)/dt = kPH₂P_(To1)^(-0.5) The activation energy at 50-65℃ was found to be 15.4㎉/㏖.

어패럴 CAD 시스템을 활용한 플레어 스커트 연구

류경옥,송미령 한국의류학회 1998 한국의류학회지 Vol.22 No.1

This study was performed to develop the flare skirt pattern in CAD system by each of the textile's test. I made 28 flare skirts( 360? length of 60 cm, straight grain at front & side seam, 28 kind of textiles) and found the changes of skirt length. And I measured thickness, weight, density, drapability and bending in these textiles. Therefore, It analyzed these data and found it regression.

Dynamic Model 을 이용한 PVC 열분해의 속도론적 연구

류경옥,김희택,이해평,오세천 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5

동적 모델 방법을 이용한 TGA 분석방법을 이용하여 PVC 열분해의 속도론적 연구를 수행하였다. PVC의 경우 두 단계에 걸쳐 열분해가 일어나며 각각에 대하여 속도상수 값이 계산 가능함을 확인할 수 있었으며 첫 번째 열분해 단계에 대하여 159.7 kJ/㏖을, 그리고 두 번째 단계에 대하여 189.6 kJ/㏖의 겉보기 활성화 에너지의 값을 각각 얻을 수 있었다. 또한 본 연구에서 제안한 속도론적 해석 방법의 효용성을 확인하기 위하여 기존의 문헌에 발표된 여러 가지의 방법들을 이용한 PVC의 열분해 속도론적 결과와 비교 검토하였다. The kinetic analysis of the thermal degradation of poly(vinyl chloride)(PVC) has been studied by a conventional thermogravimetric technique using dynamic model method. The thermal degradation was found to be a complex process composed of at least two steps for which kinetic values can be calculated. The kinetic analysis of PVC gave apparent activation energy of 159.7 kJ/㏖ for the first step with a value of 189.6 kJ/㏖for the second step. To verify the effectiveness of the kinetic analysis method proposed in this work, the results based on dynamic model method were compared to those of analytical methods reported in the literature.

페프린트배선기판(PCBs)과 폐범퍼의 열분해 및 연소 특성에 관한 연구

류경옥,김명수,김희택,이해평,류한응,오세천,이봉한,권우택 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3

폐프린트배선기관(PCBs)과 폐범퍼의 열분해 및 연소특성에 관한 연구를 TG, GC-MS 및 FT-IR을 이용하여 수행하였다. 열적 분해반응의 속도상수에 대한 정보를 얻기 위하여 질량감소 곡선 및 그 미분값을 Flynn-Wall, Coats-Redfern 및 Ozawa 방법을 이용하여 해석하였다. 속도론적 연구결과로부터 폐범퍼의 겉보기 활성화에너지 값은 질소분위기에서 보다 공기분위기에서 더 낮은 값을 보여주었으며 반면에 PCBs의 경우 분위기에 따라 겉보기 활성화 에너지 값에 거의 변화가 없음을 알 수 있었다. 생성물의 특성 분석으로부터 PCBs 와 폐범퍼의 열분해 및 연소로부터 생성된 물질은 주로 가스 성분이었으며 산소의 농도가 증가함에 따라 잔류물의 함량은 줄어들었다. 그리고 액상 생성물의 방향족 화합물 성분은 온도가 감소함에 따라 Diels-Alder반응에 의한 에텐 및 부타디엔 등과 같은 기상 생성물의 재중합으로 인하여 증가하였다. 또한 연소후 생성된 잔류물의 재활용 가능성을 확인하기 위하여 PCBs로부터의 잔류물에 대한 표면적과 adsorption total pore volume을 측정하였다. The pyrolysis and combustion characteristics of printed circuit boards(PCBs) and waste bumper have been studied by using thermogravimetry(TG), gas chromatograph-mass spectrometry(GC-MS) and fourier transform infrared spectroscope(FT-IR). To obtain the information on the kinetic parameters of thermal decomposition of PCBs and waste bumper, the dynamic thermogravimetric analysis curve and its derivative have been analyzed by Flynn-Wall, Coats-Redfern and Ozawa methods. From the kinetic analysis, the apparent activation energies of waste bumper in air atmosphere are lower than those in nitrogen atmosphere while the apparent activation energies of PCBs are little effected by atmosphere. From the products analysis, the products from the pyrolysis and combustion of PCBs and waste bumper are mainly composed of gaseous products. As the concentration of oxygen increases, an decreasing tendency of the yield of residue from PCBs is observed. The aromatic compounds of liquid product increase as decreasing the temperature because the gas product such as ethene, propene and butadiene are combined by the Diels-Alder reaction. To verify the possibility for the recycling of residue from pyrolysis and combustion, the resulting residue of PCBs has been analyzed for their surface area and adsorption total pore volume.

화학공학의 현주소와 전망

류경옥 漢陽大學校 敎育大學院 1989 敎育論叢 Vol.6 No.-

계의 분리법을 이용한 열교환망의 합성

류경옥,이해평 한국화학공학회 1996 NICE Vol.14 No.4

계의 분리를 통한 최적 열교환망 합성에 관한 연구

류경옥,이해평 한국화학공학회 1994 NICE Vol.12 No.4

한국 성인 여성의 손 계측연구 : 장갑의 치수 설정을 중심으로 Focusing on Glove Size

류경옥,서미아 服飾文化學會 2004 服飾文化硏究 Vol.12 No.2

The purpose of this study was to develop the sizing system for women's glove. The combination of anthropometric and engineering aspects of glove pattern-making is difficult problem in engineering clothing. And the traditional measurements is not enough for glove. Therefore, to develop the hand measurement method and dimension for glove, a comprehensive list of candidate measurements was reviewed and the manufacturers (Their career was over the 15years.) were interviewed on the method of glove pattern-making. This study was conducted traditional and creative 88 two-dimensional anthropometric measurements and 4 photometric measurements for glove pattern-making. In addition, 16 creative measurements were instrumented using a special hand measuring board for measuring of landmark locations on the hand. The subjects were 260 women's right hand in the age group of 18 to 35 years old in Korea.