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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 :
KIM JAE JEONG
Volume & Issues
Volume 29, Issue 6 - Dec 1991
Volume 29, Issue 5 - Oct 1991
Volume 29, Issue 4 - Aug 1991
Volume 29, Issue 3 - Jun 1991
Volume 29, Issue 2 - Apr 1991
Volume 29, Issue 1 - Feb 1991
Selecting the target year
A Study on Mechanism of Mixed Gas Separation Using Microporous CA(cellulose acetate) Membrane
Min, Dong-Soon ; Cho, Chan-Hwi ; Lee, Han-Ju ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 389~389
To analyse the phenomena of mixed gas separation via a membrane, experimental data and calculated data by the Viscous Leak Model and the Weller Steiner Model were compared. In the experimentals, separation data of
gas through a CA membrane(SEPA-97) at different temperature and pressure were obtained. For the Viscous Leak Model calculation, a pore size distribution of the membrane by the BET method was used. The predictions by the Viscous Leak Model was significantly better than those by the Weller Steiner Model. Considering the uncertainty involved with the accurate measurement of pore size distribution on the skin of the membrane, the results by the Viscous Leak Model were rather good.
Kinetics of Metane Steam Reforming
Kim, Dong-Hyun ; Lee, Tae-Jin ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 396~396
The kinetics of the methane steam reforming reaction over an industrial catalyst(ICI 57-4M) was investigated at temperatures
and at total pressures 1-5 atm in a flow reactor. The experiments were performed by varying the inlet partial pressure of methane, hydrogen, and water. Depending on hydrogen partial pressures and reaction temperatures, the following two rate equations, one with the hydrogen inhibition effects and the other without the effects, were given:
The hydrogen inhibition effect was observed at high hydrogen partial pressures, and with increasing reaction temperature, the hydrogen partial pressure above which the inhibition effect became significant has increased. Depending on the rate expressions chosen for the analysis of the data, it was also shown that the activation energies and the interpretation on the role of the reactant species involved could be widely different.
Fuel Gas Encapsulation in Ion-Exchanged Zeolite A -1. Encapsulation Characteristics for
Heo, Nam-Ho ; Rho, Byung-Ryul ; Kim, Dong-Hyun ; Kim, Jong-Taik ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 407~407
Encapsulation characteristics of cation-exchanged zeolite A as hydrogen and methane storage media by means of intracrystalline encapsulation was investigated. The storage efficiency of
ion-exchanged zeolite A was measured in terms of
, the maximum capacity for fuel gas under a difined set of conditions.
containing Zeolite A seems to be the best one for the encapsulation of hydrogen and methane gas molecules with most efficient control of 8-ring window opening, while K-A and Rb-A show leakage of
at ambient conditions. Encapsulation capacity is proportional to encapsulation pressure and encapsulated gas molecules lose their degrees of freedom as pure gas molecules within limited volume of zeolitic cavities. With more than three
ions per unit cell, energy barrier for the window opening increases drastically resulting in decrease of encapsulation capacity due to the decrease in the diffusion rate of the molecules through the zeolite channel.
with 3.0>x>2.3 shows the encapsulation capacity of
higer than that of
by about 5 times(5.3 and 5.0 times for
Simulation of Spray Pyrolysis Reactor by Numerical Methods (I) -On the Behavior of Aerosols inside the Reactor-
Kim, Kyo-Seon ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 417~417
A model has been developed for spray pyrolysis reactor, considering continuity, momentum, energy and mass balances in the reactor. By numerical integration of model equations, the profiles of gas temperature, gas stream velocity and aerosol concentration are shown inside the reactor and the paths and temperature histories of aerosols are described along the reactor. Aerosols are moving toward the center of spary pyrolysis reactor in the radial direction by thermophoresis and aerosols are not found in the region near the reactor wall. The radial gas stream velocity is significant around r/R=0.5 and is in the direction toward the center of reactor when the gas flow is heated rapidly. As the gas flow rate increases, aerosols begin to have less residence time under pyrolysis temperature inside the reactor and the difference of temperature histories of aerosols increases depending on the initial locations of aerosols at the reactor inlet.
An Experimental Study on Flocculation of Silica Particles in a Couette Flocculator
Lee, Gwang-Hyun ; Choi, Chang-Kyun ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 425~425
This study involves both experimental results and theoretical modeling on flocculation of suspended particles in a Couette flocculator. When fine silica particles suspended in water was flocculated by a cationic polymeric flocculant, effects of the suspension concentration, flocculant concentration, and Camp number(Gt) on flocculation were investigated in order to find the optimum condition. Based on the present experimental results, it is shown that the flocculation model which was drived under the assumption of no floc-breakage represents the experimental data very well. And the resulting, optimum Camp number is placed in the range of
Carbonization of Isotropic Pitch Fiber Oxidized with Nitric Acid Vapor or Hot Air
Lee, Jin-Ki ; In, Se-Jin ; Rhee, Bo-Sung ; Ryu, Seung-Kon ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 433~433
Isotropic pitch fiber was oxidized with nitric acid vapor and hot air respectively. Carbonization characteristics and mechanical properties of these fibers were investigated by changing the heating rate of carbonization to get the optimum oxidation and carbonization conditions of pitch fibers. Two types of oxidized fibers show quite different weight loss curves during carbonization because of different functional groups. Nitric acid vapor could reduce and shorten the oxidation temperature and time of pitch fibers com-paring to hot air without lessening the mechanical properties of carbon fibers.
Physico-Chemical Properties and Catalytic Activity of Silver-Exchanged L-type Zeolite
Kim, Jae-Seung ; Park, Nam-Cook ; Seo, Seong-Gyu ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 440~440
Physico-chemical properties and catalytic activity of silver exchanged L-type zeolite were studied by infrared spectroscopy of adsorbed CO and pyridine, X-ray diffractometry, TPR(temperature programmed reduction), hydrogen adsorption and acid-catalyzed reactions. Hydrogen was chemisorbed reversibly on the reduced silver exchanged L-type zeolite, and the active site for the hydrogen adsorption was related to a silver cluster such as
. For o-xylene transformation, the catalytic activity of AgL-48 in the presence of hydrogen was much higher than that of nitrogen alone as a carrier gas. This enhancing effect of hydrogen was reversible by the presence and the absence of gaseous hydrogen in the reaction system. This enhancing effect was also observed in the other acid-catalyzed reactions, and the chemisorbed hydrogen on the reduced AgL-48 zeolite was retained as acidic protons in the zeolite.
Biomass Characteristics and Substrate Removal Efficiency Using High Concentrated Synthetic Wastewater in FBBR
Kim, Dong-Seog ; An, Kab-Hwan ; Suh, Myung-Gyo ; Park, Tae-Joo ; Song, Seung-Koo ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 448~448
The purposes of this experiment were to investigate biomass characteristics and substrate removal efficiency and to find the optimum conditions on holding up higher biomass concentration in Fluidized-Bed Biofilm Reactor(FBBR). A number of experiments were conducted under the following conditions by increasing organic loading rate from 10kg
. Superficial upflow velocity was 17m/hr, operating temperature was
and pH was
. The synthetic wastewater based on glucose was used as a substrate in this experiment. The removal of chemical oxygen demand(COD) with volumetric loading rates of 10kg
was investigated to show the efficiency of aerobic FBBR. The corresponding COD removal efficiencies were 96 and 73% with volumetric loading rate of 10 to 80kg
, respectively, and the concentrations of biomass remaining inside the reactor were shown 6,500mg/l and 37,000mg/l, respectively. These experimental conditions of the F/M ratio of 1.7 and the biofilm thickness of
was proved to be a most appropriate condition in operating FBBR in the view of substrate removal.
Protein Transport by the Paper Electrophoresis in Organic Solvent Medium
Hong, Heon-Chul ; Ryu, Woo-Kweon ; Park, Joong-Kon ; Song, Bang-Ho ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 457~457
Electrophoresis method has been widely used to analyze protein molecules in the clinical and biological field because of low cost and simple equipment. However, there are some problems in the application of the conventional electrophoresis such as evaporation of the buffer solution, formation of concentration gradient, pH changes and heat generation during the operation. To reduce the heat generation we used an organic solvent as a medium instead of buffer solution for the electromolecular propulsion, which has been previously used for the separation of dyes. We could increase the rate of movements of lysozyme,
and pepsin and reduce the heat generation in the electromolecular propulsion. The effect of the organic solvent on the activity of the protein was verified to be negligible by the experimental analysis of the activity of
Coal Fly Ash Collection by Glass Fabrics -I. Growth of Dust Deposition and Pressure Drop Characteristics-
Park, Young-Ok ; Ghim, Young-Sung ; Son, Jae-Ek ; Chung, Tai-Soo ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 463~463
Collections of coal fly ash by high-temperature glassfiber fabrics were tested aiming at control of particulates from industrial coal-fired boilers. Growth of dust deposition and pressure drop were investigated by varying filtration velocity and dust loading at a bench-scale test unit. Characteristics of fabrics recently developed by Kangnam Ind. Co. (KN-448) were compared by those of imported fabrics manufactured by Burlington Glass Fabrics Co. (Bt-448). Pores of KN-448 were not so complete and uniform as those of BT-448 and pressure drop across KN-448 was lower than that across BT-448. However relative difference of pressure drops between the two fabrics was reduced with increasing dust loading.
Orthogonal Grid Generation in 2-D Domains via Boundary Integral Technique and Its Applications
Kang, In-Seok ; Bae, Jin-Chan ; Noh, Dong-Soo ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 470~470
A new numerical scheme, which is expected to be applied for numerical analyses of various engineering problems, is proposed for the orthogonal grid generation in an arbitrary 2-D domain. The scheme is robust and non-iterative, and based on the conjunction of boundary integral technique and the covariant Laplace equation method. In the scheme, two types of problems are considered : 1)The distortion function is specified in the product form
, or 2) Boundary correspondence is specified on the two adjacent sides of the boundary. The scheme has also been tested for various application problems, and it has been confirmed that the scheme is very successful.
Calculation of Steady State Gains for Chemical Process with Recycle
Ko, Jae-Wook ; Yoon, En-Sup ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 481~481
The steady state gains of variables of the process which has recycle streams(most of all chemical processes)are different from those of each individual process. If the gains of individual process are applied to the criterion for the steady state gains, it is wrong to pair the control loops and analyze the interaction of variables of process with recycle. In the end the resonable selection of control structure is mistaken. The proper calculation method of steady state gains of process which has recycle streams was proposed through the efficient sensitivity analysis of process flowsheet variables. The treated recycle processes were divided into two cases. In the first case, independent variables(input variables)only exist in the interesting unit and in the second case, independent variables exit several units at the same time. The method was suggested to calculate correctly the steady state gains for the each case. The suggested method was applied to example to illustrate its usefulness.
A Study on Concentration of Ethanol by Supercritical Fluids and Salts(II) -High Pressure Vapor-Liquid Equilibria for
Cho, Jeong-Shik ; Lim, Jong-Sung ; Kim, Jai-Duk ; Lee, Youn-Yong ; Chun, Hai-Soo ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 487~487
High pressure vapor-liquid equilibria for
system were measured at two temperatures of 313.2K and 333.2K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from 7.9MPa to 18.5MPa. The ethanol concentration in feed varied from 20wt% to 70wt%(
free basis). The Patel-Teja Equation of State with Adachi-Sugie mixing rule predicted the experimental data better than the same equation of state with Wilson type mixing rule and group contribution Equation of State, but could not accurately represent the behavior of the separation factor and distribution coefficient.
The Effect of Phosphorus Impregnation on HZSM-5 Zeolite in 1-Butene Conversion
Seo, Gon ; Kim, Do-Chul ; Ko, Tae-Seog ; Park, Tae-Jin ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 494~494
Conversion reaction of 1-butene over phosphorus-impregnated HZSM-5 zeolite was studied. The effect of phosphorus impregnation was discussed with the product distributions observed at various conditions of reaction temperature and partial pressure of 1-butene. The initial product distribution can be explained by the reaction path based on the formation of octene or dodecene from two or three molecules of 1-butene via cracking to smaller olefins. activities for the cracking of pentanes and hexenes and for the dehydrocyclization to aromatic formation were reduced by the phosphorus impregnation. These effects were explained by the reduction of catalytic activity for cracking and dehydrocyclization of olefin.
Analysis of Plastics Pyrolysis in a Thermogravimetric Analyzer by an Arrhenius-type Rate Equation Including the Effect of Transfer Lag
Ghim, Young-Sung ;
Korean Chemical Engineering Research, volume 29, issue 4, 1991, Pages 503~503
Concept of the transfer lag was introduced to a basic form of the Arrhenius-type rate equation to interpret the results of plastics pyrolysis in a thermogravimetric analyzer. A first-order system with time constant
was assumed between ambient temperature and sample average temperature changes and
was varied with the degradation of the sample. This type of model successfully described most features of plastics pyrolysis with various heating methods of the thermogravimetric analyzer. But the model was still incomplete to express the degradations when the secondary reactions were important, such as those in the latter phase of pyrolysis and those at lower temperatures.