시멘트에 대한 유변학적 상태방정식의 응용성에 관한 연구

변헌수,조형찬 여수대학교 1998 論文集 Vol.12 No.2

In this study, using of experimental data, we are applied in rheological equation of state. The calculate result obtained in the range of this study are as such the following: 1. If the steady-state shear viscosity(η) is a state function, presented in rheological equation of state by exact differential equation. 2. We have obtained the each parameter of the rheological equation of state using experimental data. 3. The mean error of the calculated values and experimental values was of less than about 2% with each other J and D. 4. However, we have obtained rheological equation of state from state funciton. ??

고압상평형 측정을 위하여 미량시료채취법에 의한 분석방법 연구

변헌수,김태규,곽철 여수대학교 1996 論文集 Vol.10 No.-

In order to plant design of supercritical separatation process, the high pressure phase equilibrium data are essential. In analysis method, the phase equilibria data of each phase by the microsampling technique were analyze by gas chromatograhpy in microsampling with heavy molecular weight. The calibration results of vapor and liquid phase sampling loop were presented 26.4㎕ and 22.7㎕, respectively. In this work, the RRF(relative response factor) on the tetralin, α-tetralone and α-tetralol were showed 1.87, 1.60 and 1.65. Using the calibrated valve, obtained the high pressure phase equilibria and mixture density data of the vapor and liquid phase.

이소부틸로니트릴의 합성에 따른 촉매의 영향

변헌수,전남석 여수대학교 1998 論文集 Vol.13 No.2

By the catalytic dehydration, these are obtained to the preparation of isobutyronitrile from isobutyl aldehyde with the various catalyst: platinum metal on activated carbon, palladium on activated carbon, zinc metal. AgNO₃, cobalt oxide, alumina-supported zinc oxide. The available catalyst was selected by the conversion ratio of the isobutyronitrile from isobutyl aldehyde over the atmosphere pressure at 150 and 300℃. By the experimental data, it was available for the preparation of this to alumina-supported zinc oxide as a catalyst. And it was available for this preparation with the selected catalyst to the temperature from 380 to 420℃.

고무의 산화방지제인 N-(1,3-dimethylbuthyl)-N'-phenyl- p-phenylene-diamine의 제조 및 특성

변헌수,전남석 여수대학교 1998 論文集 Vol.13 No.2

We were studied to the preparation and the study of property of N-(1.3-dimethyl-butyl)-N'-phenyl-p-phenylene-diamine from diphenylamine by the various synthetic methods : nitrosoation, rearrangement, hydrogenation and reductive alkylation. In this study, we were obtained to the optimum conditions of reaction step and applied the obtained data in Lab. to plant. The data of Lab. test were as follows : the purity of p-amino-diphenylamine from diphenylamine was 97.0% and the yield of p-amino-diphenyl-amine from diphenylamine was 88.0%, the purity of N-(1.3-dimethylbutyl)-N'-phenyl-p-phenylene-diamine from diphenyl-amine was 98.5% and the yield of N-(1.3-dimethylbutyl)-N'-phenyl-p-phenylene-diamine from dipheny-lamine was 98.0%.

혼합엔탈피와 기-액평형간의 압력에 대한 상관성

변헌수,곽 철 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

본 연구는 혼합엔탈피데이터를 이용하여 기-액평형을 추산하는 과정에서 압력변화가 기액평형에 미치는 영향을 고찰하고자 하였다. 따라서 이성분계인 carbon disulfide-benzene(298.2K), benzene-toluene(298.2K, 313.2K, 323.2K), methanol-1-butanol(298.2K), methanol-ethanol(298.2K), chloroform-carbon tetrachloride(298.2K) 그리고 carbon tetrachloride-benzene(298.2K)계들의 혼합엔탈피의 데이터를 이용하여 압력을 추산하였다. 한편 혼합엔탈피를 이용한 Wilson model과 UNIQUAC model을 비선형최소자승법에 의해 계산된 활동도계수를 Redlich-Kister방법으로 열역학적 건전성을 확인하였다. 본 연구 범위에서 예측된 압력의 변화를 Wilson model과 UNIQUAC model로 비교한 결과 AAD는 각각 0.31-27.93과 1.51-41.19로 나타났다. 따라서 Wilson model이 UNIQUAC model보다 더 좋은 model이었으며 비교적 방향족탄화수소계보다 알코올계가 잘 일치함으로 보였다. The pressure variation in process of estimate to vapor-liquid equilibrium were considered using enthapies of mixing data. For the carbon disulfide-benzene(298.2K), benzene-toluene(293.2K,313.2K,323.2K), methanol-1-butanol(298.2K), methanol-ethanol(298.2K), chloroform-carbon tetrachloride(298.2K) and carbon tetrachloride-benzene(298.2K) system in binary of enthalpies of mixing were predicted of pressure variation by Wilson model and UNIQUAC model. The parameter of the model were estimated by nonlinear least square method, which were substituted into the model to obtain the activity coefficients of the each systems. The thermodyamic consistency of the activity coefficients was confirmed by Redlich-Kister method. In this study, The AAD of the estimated value of pressure were in the range of 0.31-27.93 in the of Wilson model, and were in the range of 1.51-41.19 in the case of UNIQUAC model, compared with the data for literatures.

3차 상태 방정식들에 의한 Co₂-Tetralin계 및 CO₂-α-Tetralone계에 대한 상평형 해석

변헌수,박인수,곽철 경남대학교 신소재연구소 1994 論文集 Vol.4 No.-

Tetralin과 이산화탄소 그리고 α-tetralone과 이산화탄소의 이성분계들에 대해 3차 상태방정식인 Redlich-Kwong식, Soave-Redlich-Kwong식 그리고 Peng-Robinson식을 사용하여 기액평형 값을 예측하였다. 추산된 값과 실험값을 비교, 검토한 결과 Peng-Robinson 상태방정식이 다른 방정식에 비해 좋은 접근을 보였다. 또한 이때의 이성분계의 최적 상호작용 파라미터를 온도의 함수로 나타내었다. The vapor-liquid phase equilibria of tetralin and a-tetralone with carbon dioxide were predicted to take advantage of Redlich-Kwong equation, Soave-Redlich-Kwong equation and Peng-Robinson equation in cubic equation of states. The results from comparison predicted values with experimental values have shown that Peng-Robinson equation have better approach than other equations. Also, the optimum interaction parameters kij of the binary systems were presented as the function of temperature.

p-Amino-diphenylamine으로부터 N-phenyl-N'-iospropyl-p-phenylene-diamine의 합성 및 특성

변헌수,전남석 여수대학교 1998 論文集 Vol.13 No.2

We were studied to the preparation and property of N-phenyl-N'-isopropyl-p-phenylene-diamine from p-amino-diphenylamine with the various type of precious metal catalyst : 3% platinum on activated carbon. 5% palladium on activated carbon. In this study, we were obtained to the optimum conditions of reaction step in Lab. The data of Lab test were as follows : the purity of N-pheny-N'-isoprophyl-p-phenylene-diamine from p-amino-diphenyl-amine was 97.0% and the yield of N-phenyl-N'-isoprophyl-p-phenylene-diamine from p-amino-diphenylamine was 97.5%.

고압에서 삼성분 CO₂-α-테트라톤-테트라린계의 기-액상평형 측정

변헌수,곽철 경남대학교 신소재연구소 1996 論文集 Vol.6 No.-

본 연구는 방향족탄화수소인 α-tetralone과 tetralin을 초임계 이산화탄소를 이용하여 초임계 분리공정의 설계에 대한 기초 자료로 제시하기 위해 삼성분 고압상평형 실험을 수행하였다. 실험장치는 기상과 액상을 동시에 순환시킬 수 있는 순환형(circulation type)을 사용하였다. 삼성분 CO₂-α-tetralone-tetralin계에 대해 기액상평형 자료를 온도 343.2 K에서 6.0-19.0MPz 압력범위에서 압력과 조성을 변화시키면서 액상과 기상에서 압력에 EK른 몰분율을 얻었다. 그 결과 액상은 압력이 증가함에 따라 이산화탄소의 몰분율이 증가함을 알 수 있고, 기상은 압력이 증가함에 따라 α-tetralone과 tetralin합(sum)의 몰분율이 증가함을 알 수 있었다. The vapor-liquid phase equilibria of α -tetralone and tetralin with carbon dioxide in supercritical region were studied to obtain preliminary data for supercritical separation processes. The circulation type vapor-liquid equilibrium apparatus has been used during this research to get ternary data. The ternary vapor-liquid phase equilibria of CO₂-a-tetralone-tetralin system were measured for pressures ranging from about 6.0 to the 19.0 at 343.2K. The liquid phase composition of carbon dioxide and the sum of vapor compositions of a-tetralone and tetralin are increased as the pressure is increased.

초임계 이산화탄소내에서 방향족탄화수소와의 삼성분계 혼합물에 관한 기액상평형

최태현,변헌수 여수대학교 1998 論文集 Vol.11 No.2

The high pressure vapor-liquid equilibrium data are essential in order to separate the mixture of toluene and p-xylene with supercritical carbon dioxide. The circulation type vapor-liquid equilibrium apparatus has been used during this research to get ternary data of toluene, p-xylene and carbon dioxide system. The ternary phase liquid-vapor equilibria of carbon dioxide, toluene and p-xylene were measured for pressures ranging from about 26 bar to the 100 bar at 100℃. The liquid phase composition of carbon dioxide and the sum of vapor phase compositions of toluene and p-xylene are increased as the pressure is increased.

고압에서 에틸렌 부틸 아크레이트 공중합체-에틸렌계의 상거동에 관한 연구

곽철,변헌수 여수대학교 1997 論文集 Vol.11 No.2

Cloud point data for ethylene butyl acrylate copolymer-ethylene mixtures are presented to 250℃ and 2,600 bar as a function of butyl acrylate(BA) content from 5.2, 7.6, 16.9, 17.0, 17.2, 25.2, 25.9, 40.3, and 100 mol% BA and of molecular weight. Cloud-point pressures initially decreasing BA content at rate of about 18bar/mol% BA up to about 40 mol% BA and then they remain relatively constant with further increases in BA content. The cloud-point pressures increase with increasing weight-average molecular weight( Mw ), at a rate of about 3.8 bar/10,000 Mw . Also, it is not possible to dissolve poly(methyl acrylate) in ethylene to 240℃ and 2,600 bar, althouth poly(butyl acrylate) readily dissolves in ethylene at pressures as low as 800 bar at 50℃.