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정일현,전해수 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.2
반응기 내 유체를 전기화학 반응시켜 만든 추적자를 이용하여 반응기를 해석하였다. 주입점 전역에서 추적자가 균일하게 발생되도록 분산판을 이용하여 이상적인 단계 함수를 주입하여 이때 얻어진 응답만으로 고정층 반응기에 대한 단일 매기 변수(one parameter) 모델식의 축 방향 분산 계수 산출의 여러 방법을 비교 검토하였다. 그 결과 분포 곡선의 최대치는 실험 값보다 모두 크게 나타났으며, 오차가 가장 작은 방법(method) III는 1.04% 이내의 오차를 나타내었다. 이 방법으로 부터 구한 축 방향 분산 계수는 다음과 같이 나타낼 수 있다. D_L = 0.82U^(0.983)_S dp^(0.933), (㎠/sec) The reactor was analysed by a tracer, which was made by electrochemical reaction out of fluid. Tracer was injected as a step of idealized shape in distributor, which evenly made the tracer. Axial dispersion coefficients are estimated from various methods of parameters model in inert fixed bed reactor by the analysis of the ideal step function technique. As a result, maximum values of distribution curves are higher than experimental value, and the response signals predicted are then compared with the measured signal; Method III agrees well with the measured signal: Method IV is very close to the measured signal, but Method II deviates significantly from the measured signal: Method IV is found to give parameter values close to those of the Method III analysis, from which the most realiable values are obtained. Next to the Method IV are, in order of Method IV fitting, the Method V and Method I and Method II. The experimental error of Method II is 1.04 %. Using the axial dispersion coefficient estimated from Method III, we could obtained the following relationship. D_L = 0.82U^(0.983)_S dp^(0.933), (㎠/sec)
정일현 목포대학교 연안환경연구소 2000 沿岸環境硏究 Vol.17 No.1
Composting process of organic wastes, closely related to the mechanization of organic farming, could induce the uses of the compost to restore farmlands. This study was to compost the mixture of night-soil treatment sludge and rice wine-lees waste, both of which are organic wastes, and to systemize the proper composting process of organic waste so as to recycle them for agricultural purposes. Also the purpose of this study is to examine the possibility to retrieve the fermenting heat produced in the produced in the process of composting, to improve the unit operation skills for producing compost and using it, and to present a method for reusing highly concentrated organic wastes as a resource of agricultural productivity.
유동층 전극 반응기의 Process Nodeling에 관한 연구
鄭一鉉,李在福 단국대학교 1980 論文集 Vol.14 No.-
For the reaction of electro-chemical Cu^++ reduction at fluidized bed electrode reactor, an experimental analysis of effective conductivites for continuous phase and dispersed phase was carried out showing the influence of bed voidage, flow velocity, corrent density, and electrolyte Conductivity. Theoretical calculations of a simple mathematical model yield reliable values as is shown by compaison with the experimental resultr, the mathematical is as follows: i_s=-K_s dø_s/dx K_s=0.26R·ε^-4.1·ε_b^08 i_m=-K_m dø_m/dx K_m= 2330R_e^-3.1·(i^.3/i_0)^0.42·ε^0.3·K^1.08
정일현 ( Jung Il Hyun ) 한국공업화학회 2003 공업화학 Vol.14 No.4
본 연구에서는 RF 플라즈마 공정과 열처리 공정에 의해 합성된 티타니아 분말의 특성을 분석하였다. 플라즈마에 의해 합성된 분말은 나노 입자를 형성한 후 서로 뭉치면서 만들어졌다. 1차 분말의 유기물질 함유량이 0.5~3%이었다. 열처리 온도 700℃에서 RF-출력이 400 watt 이상으로 증가할수록 아나타제의 비율이 증가하였다. 열처리 온도가 증가할수록 결정의 크기는 증가하였으며, 분말의 결정 크기는 약 20~60 nm이었다. In this study, an analysis was made on the characteristics of titania powders synthesized by RF plasma process and the annealing process. In the plasma process, titania powders were synthesized by aggregation of initially formed nano-particles. The titania powders appeared to be amorphous, and the purity of the amorphous titania powder improved considerably compared to the powder from existing processes. The amount of organic materials contained in the powder was approximately 0.5 ~3% in weight. The ratio of the anatase phase in the powder was increased in accordance with the increase of RF-power over 400 watt under the constant annealing temperature of 700℃. The crystallite size ranged about 20 to 68 nm and it increased when the annealing temperature increased.
플라즈마를 이용하여 제조한 CHF_3 복합막의 기체투과 특성연구
정일현,현상원 단국대학교 1998 論文集 Vol.33 No.-
In this study, Nonporous plasma membrane was prepared for obtaining high permeability and selectivity. The membrane is made from the Al_2O_3 mane with the different pore size by using CHF_3 monomer. The permeability characteristics of the plasma polymer membrane was investigated. The selectivity is very increased according to Ar plasma treatment time and rfpower at closing the intervals of substrate and cathode. The pore size of Al_2O_3 membrane influence on the permeability and the intervals of substrate influence on selectivity.
γ-Alumina에 담지된 산화구리에 의한 SO_2의 제거에 관한 연구
鄭一鉉,尹龍水,全法柱 단국대학교 1992 論文集 Vol.26 No.-
In the case of SO_2 removal from the flue gases by fixed beds of coper oxide in two types or γ-Aluminas with different pore size distribution, the reactive sorption capability were correlated with not only porosity and pore size distribution in the reacting solid but impregnated concentration of the reacting solid but impregnated concentration of the copper oxide. The effect of change of pore structures on the kineticc of gas-solid reaction was investigated through the random pore model. Mathematical model og gas-solid noncatalytic reaction for the concentration vs. time relationship in corporating chemical reaction, product layer diffusion, and the effect of structural change due to chemical reaction has been derived. Numerical solution were obtained to the model equations for various values of the parameters characterizing the pore structure, effective internal diffusion, and the chemical reaction constant. From the results, the conversion was decreased cause of pore closure at the surface of reactiong particles, reduction of porosity and surface area of reaction, and increase of effective diffusion coefficient in the solid with the progress of reaction, Conversion was increased with rised concentration of flue gas since that CuO-SO_2 reaction mechanism assumed to be first order. Total conversion was strongly dependent on the local conversion at surface. According to decreas of impregnated concentration of the copper oxide and increase of the flue gases concentration, total conversion was increased. The conversion was affected by gas flow rate and pore size distribution in the reacting solid.