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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
Volume & Issues
Volume 25, Issue 6 - Dec 1987
Volume 25, Issue 5 - Oct 1987
Volume 25, Issue 4 - Aug 1987
Volume 25, Issue 3 - Jun 1987
Volume 25, Issue 2 - Apr 1987
Volume 25, Issue 1 - Feb 1987
Selecting the target year
Separation of Benzene-Cyclohexane Mixture by Emulsion-Type Liquid Membrane
Chang, Byeung-Mo ; Chung, Tai-Soo ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 209~209
In the separation by emulsion-type liquid membrane of benzene-cyclohexane mixture(the difference between the boiling points of the two components is small), the effects of feed composition, the volume ratio of solvent to feed, surfactant concentration and glycerol concentration on the separation factor have been studied. As the averages separation factor of 5.74 for this system at the contact time of 10 minutes for various feed composition, this technique has been found much more effective than the distillation method. Since the relative solubility ratio of benzene in benzene-cyclohexane mixture is greater than that of cyclohexane, the separation factor has been found to increase as the concentration of benzene increases up to 70 mol per cent. It has also been found that the permeation of benzene has reached the maximum value when the volume ratio of solvent to feed is equal to four. The separation has been most effective at the concentration of the surfactant below one weight per cent in which the separation factor increases rapidly with increasing contact time, while the contact time has nearly no effect on the separation factor at the surfactant concentration above one weight per cent. The separation factor has also been effective at the glycerol concentration of 50 weight per cent.
Numerical Simulation of Annular Cavity Filling and Curing in an Epoxy RIM Process
Chung, Ho-Gap ; Park, Hern-Jin ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 217~217
Annular cavity filling and curing in an epoxy RIM process is simulated numerically for the various operating conditions. For the analysis of the filling step, the flow field is divided into two subdomains : the main flow region where the materials have one dimensional flow, and the front region where the materials have two dimensional flow. The effect of the operating conditions on the temperature and conversion rate inside the mold is analyzed numerically by the upwind differencing scheme. When the temperature of the material to be injected becomes higher, the reaction rate increases rapidly and brings about the corresponding temperature increase in the mold. The excessive high temperature may cause the polymerized epoxy to be thermally degraded. Thus the temperature increase of the inlet material has to be limited. The temperature increase at the mold wall shows the similar effect. The temperatures at the mold wall and of the inlet material are the important factors of the process. A relation between the fill time and the maximum inlet pressure is also deduced.
Characterization of OH Groups on Alumina by Infrared Spectroscopy
Kim, Jong-Taik ; Kim, Myung-Chul ; Nam, Woo-Hyun ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 229~229
The OH absorption bands of boehmite on the infrared spectra obtained at the various temperatures were deconvoluted by the simplex method of computer program. The deconvoluted bands of boehmite corresponded to five specific OH groups appeared to have band maxima at
(band 5). The band 1 and 2 were assigned to the symmetric and asymmetric stretching vibrations of hydroxy1 groups of hydrated aluminum cations. The absorption of band 3 and 4 were assigned to the structural hydroxyls located between the alumina layers. And the band 5 was assigned to the single OH attached to the aluminum.
Thermal Degradation of Polymer Material by Thermogravimetry and Viscometry - A Kinetic Data Analysis of PMMA, PEMA PBMA and MMA-EMA Copolymer -
Seul, Soo-Duk ; Kim, Dong-Keun ; Park, Sang-Wook ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 237~237
The thermal decomposition of polyalkyl methacrylate such as polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate and methyl methacrylate-ethyl methacrylate copolymer was studied using a thermogravimetry with nitrogen gas feed rate of 50 ml/min at various heating rates from 1 to
/min, and various heating temperatures from 200 to
. Viscometry techniques were also used to measure molecular weight changes during the thermal decomposition. The mathematical methods, Kissinger, Chatterjee-Conrad, Friedman, Second derivative, Horowitz-Metzger, Ozawa and lsothermal method were used to obtain values of activation energy of decomposion reaction. The activation energies evaluated by the above methods except Chatterjee-Conrad method agree with each other very well. The values of activation energy evaluated by viscometry are also similar with those by thermogravimetry. The thermal degradation of polyalkyl methacrylate was considered to be carried out by main chain scission, and the values of activation energy decreased in the order of methyl, ethyl and buthyl group. The thermogravimetric trace curve agreed with the theoretical equation. The value of activation energy of the copolymer obeyed the addition rule.
Global Analysis of Multi-Stage Distillation of Nitric Acid
Chang, Kil-Sang ; Park, Geun-Il ; Chun, Kwan-Sik ; Park, Hyun-Soo ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 249~249
Multi-stage distillation column for the concentration of nitric acid was completely analyzed. Composition, hold up and enthalpy changes (CHE) are considered in the MESH equations and thus for binary systems, the steady states can be expressed as the solutions of 3(N+1) nonlinear algebraic equations for column of N stages and a reboiler stage. Here, solving the hold up and enthalpy balance equations analytically the liquid and vapor flow rates are obtained as the functions of concentration of each stage and the number of equations reduced to (N+1). For this system, Newton-Raphson method and implicit function theorem are applied to obtain the steady state behavior depending on the change of opeartion parameters such as feed stage, feed concentration, temperature, reflux flow rate and reboiler heating rate, and consequently the optimal operating conditions are suggested.
Vapor-Liquid Equilibria for Binary Systems:1.3.5 Trimethylbenzene-N. Formylmorpholine, m. Xylene-N. Formylmorpholine
Lee, Bo-Seong ; Park, So-Jin ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 259~259
Vapor-liquid equilibrium data for two binary systems :1.3.5 Trimethylbenzene-N. Formylmorpholine, m. Xylene-N. Formylmorpholine, were determined by dynamic method with recirculating equilibrium still at 150 mbar. These equilibrium data were checked for thermodynamic consistency by using the integral test and the point-to-point test. Our experimental data were thermodynamically consistent.
Squeeze Film Flow of Viscoplastic Fluids I. Measurement of Yield Stress and Herschel-Bulkley Parameters
Cha, Hyuk-Jin ; Lee, Seung-Jong ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 267~267
Squeeze film flow of viscoplastic Herschel-Bulkley fluids between two parallel circular plates under a constant load was analyzed theoretically to derive an approximate solution. This solution was used to determine the yield stress (
) and Herschel-Bulkley parameters (n,
) of two test materials from their experimental squeezing curves. The results showed that the simple squeeze film apparatus could be used to determine the yield stress and other rheological properties of viscoplastic materials.
Reduction with Isobutyraldehyde and Reoxidation of Reduced
Yu, Je-Kwan ; Kim, Young-Myoung ; Chung, Woo-Chang ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 275~275
The kinetics of the reduction of
with isobutyraldehyde and the reoxidation of reduced
with oxygen were studied in a flow microbalance reactor over the temperature range of
, isobutyraldehyde partial pressure of 0.04-0.17 atm and oxygen partial pressure of 0.3 atm. On the reduction of
with isobutyraldehyde, isobutyraldehyde was mainly dehydrogenated to methacrolein and
was completely reduced to
at higher temperature than
. The degree of reduction of
was decreased with decrease in reaction temperature at lower temperatures. This reaction of
reduction with isobutyraldehyde could be explained by chemical reaction control in the unreacted core model and the activation energy was 15 Kcal/g mole. On the reoxidation of
with oxygen over the temperature range of
was almost reoxidized to
and its reaction model could be explained by diffusion control through ash layer. The activation energy of reoxidation of
was 47 Kcal/g mole.
Application of NRTL and UNIQUAC Models to Liquid-Liquid System with Halogen Salts (part II)
Choi, Joong-So ; Park, Dong-Won ; Rhim, Jin-Nam ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 283~283
Binodal curves and tie lines were determined for benzene-halogen salt solution-n-propanol systems at
, using halogen salt solutions prepared in the concentration of 15% and 25% halogen salts. For the tie line data, the correlations were made with the Eisen-Joffe equation as well as the NRTL, UNIQUAC and modified UNIQUAC models, and the parameters in the models were estimated and the values for the tie lines calculated. The effect of salt addition on liquid-liquid equilibria was also studied along with the increment of salt concentration.
Gas Absorption onto Polymer Solution using Rotating Multiroller Absorber (RMRA)
Youn, Jong-Tae ; Han, Soon-Kyo ; Rhee, Bo-Sung ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 295~295
In order to bring gas into contact with high viscosity liquid the rotating multiroller absorber(RMRA), as a gas-liquid contactor, was designed and studied with oxygen-polymer aqueous solution system. Gas and high viscosity (
) liquid film contact on the wide range of effective interfacial area, and contact time could be controlled in the range of
sec. As a experimental result of absorption, mass transfer rates could be measured in consideration of micromixing of liquid film in the nips of rollers, and has been obtained the data which correlated within
by an equation
Chlorination and Coagulation of Humic Acid
Chun, Hee-Dong ; Lee, Moon-Deuk ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 303~303
The formation mechanism of THM from humic acid was studied. The changes in compositions and functional groups of chlorinated humic acid were investigated and 3-chloro-2-methyl but-1-ene by produced in the chlorination reaction was identified with GC-MS, FT-IR and FT-NMR. The formation mechanism was supposed with these results. The molecular weight distributions and reactivities with chlorine of humic acids extracted from the Han river and reverside soil were investigated. The formation potential of THM was independent of their molecular weights. Finally, efficiencies for the removal of humic acid with activated carbon and alum were compared. The coagulation with alum was more effective than the adsorption with activated carbon.
Conversion Reaction of Zeolite A to Zeolite HS
Kang, Tae-Gu ; Uh, Young-Sun ; Kim, Young-Man ; Seo, Gon ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 313~313
The conversion reaction of zeolite A into zeolite HS was studied at various reaction temperatures and alkalinities. The effect of crystal size of zeolite A on the rate of the conversion reaction was also studied. The rates of conversion increased at elevated reaction temperature and alkalinity and with small size of zeolite A crystal. The changes of zeolite content during the conversion reaction expressed as the equation(
) based on the surface reaction. The crystal size of zeolite HS produced did not show any relationship with that of zeolite A. The rate determinig step of the conversion reaction is the dissolution step of zeolite A and the growth of zeolite HS proceeded at the expense of soluted reactant occuring in liquid phase.
Drying Characteristics of Sodium Silicate with Additives
Moon, Sang-Heup ; Suh, Sung-Sup ; Oh, In-Hwan ; Kim, Hong-Gon ; Na, Byung-Ki ;
Korean Chemical Engineering Research, volume 25, issue 3, 1987, Pages 319~319
The drying characteristics of sodium silicate film containing as additives zinc oxide, zinc carbonate, kaolin and potassium phosphate has been observed by thermogravimetric analysis. The zinc compound additives react slowly with sodium silicate to insolubilize the latter, whereas kaolin reacts relatively rapidly by heat treatment at
. Sample containing potassium phosphate contains residual moisture even after the heat treatment for 3 hours. The informations from this study about the drying and reaction characteristics of sodium silicate containing additives may be used for obtaining a crackfree inorganic film made insoluble in water by treatment at relatively low temperatures.