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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 19, Issue 6 - Dec 1981
Volume 19, Issue 5 - Oct 1981
Volume 19, Issue 4 - Aug 1981
Volume 19, Issue 3 - Jun 1981
Volume 19, Issue 2 - Apr 1981
Volume 19, Issue 1 - Feb 1981
Selecting the target year
Properties of Amorphous Materials
Kim, Myun-Sup ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 75~75
In these days, it is interested that amorphous materials are known to have special properties as catalyst, corrosion resistance, properties as semiconductor and mechanical properties that have an difficulty of obtaining from crystalline solids. Amorphous materials is not yet well-known, for the study of its structure is difficult in comparison with it of crystalline materials. As amorphous materials are in the nonequilibrium state, they have the weak point of the nonduration of structure. But it is expected that the future uses are various because of special properties by only amorphous materials. For last ten years, according as technique of preparation of amorphous materials was developed, they had became succesively prepared by the method of solidification by rapid cooling from fused state. Amorphous materials which have strength equal to piano wire, better corrosion resistance than stainless steel and properties for light memory are now known. Here, the properties, preparations and uses of amorphous materials were reviewed.
Biological Denitrification by Pseudomonas denitrificans in a Tapered Fluidized Bed Reactor
Kim, Yong-Ha ; Chung, In-Jae ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 85~85
A tapered fluidized bed reactor was employed for biological denitrification, in which a facultative and heterotrophic denitrifier Ps. denitrificans(ATCC 13867) adhering on 25/35 mesh activated carbon was used. It has been found that optimum pH was in 7-8.5, and optimum temperature in
. The rate of nitrate reduction was almost constant irrespective of nitrate concentration and zero order. A mathematical model was developed for the design of reactor
In the experiments, K value was 0.024.
Chromatographic Parameter Estimation of Adsorption Packed Column with Molecular Sieves
Lee, Dong-Il ; Ryu, Hwa-Won ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 95~95
The parameters are determined by time domain analyses for flow system(laminar region) of nitorgen adsorption on molecular sieves (MS) 3A, 5A, and 13X in a packed column at
. Among the parameters, axial dispersion coefficients and overall effective diffusivities are determined from error maps. The
values obtained for MS 3A, 5A, and 13X are 0.08, 11.22, and 2.32, respectively, and show that nitrogen hardly adsorbs on 3A. The values of
are all in the range of
, and the De values of both 5A and 12X are
; but the De value of 3A has a rather wide range of
. The paramethers are also evaluated by usual moment method and compared with those from the time domain analyses.
values obtained from the first order moment are from the time domain analyses.
values obtained from the first order moments are similar to those from the time domain analyses, but
values from second order moments show a little difference between the two methods.
Source-Sink Flows in a Rotating Cylinder
Park, Hung-Mok ; Chang, Ho-Nam ; Yun, Chang-Ku ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 107~107
Steady axisymmetric source-sink flows of a compressible viscous fluid in a rotating cylinder is simulated numerically. The source and the sink are, respectively, the feed and the discharge slits at the end plates of the cylinder. Compressibility of the fluid is taken into account in the form of steady-state density stratification in the radial direction formed by rigid body rotation in the absence of the source and sink. Stream function-vorticity formulation is chosen for this study. Stability problem ocurring at high angular speed is overcome by using upwind difference scheme. The solution techniques used for the resulting finite difference equations are SOR and SIP(Strongly Implicit Procedure), and the latter is found to be more efficient for this set of equations. Additionally, when using SIP, we adopted the method devised by Jacobs (1974) to compensate for the error due to the artificial viscosity. The simulation results give streamlines and axial velocity profiles for the flows through the detached shear layer and the Stewartson layer near the side wall. To check the results of numerical simulation. a model cylinder was driven at an angular velocity of 200-500r.p.m. The air containing paraffine mist as a tracers is fed into the cylinder through the inlet slit at the upper end plate and is withdrawn through the outlet slits at the upper and lower plates. Values of axial velocity from the present numerical simulation were compared with those from experiments.
Design of two infrared cells for catalytic research
Moon, Sang-Heup ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 121~121
Two infrared cells are designed for investigation of adsorption property and activity of heterogeneous catalysts under vacuum and reaction conditions. The vacuum IR cell is operable at
for morethan 48 hours, and the reactor/IR cell simultaneously measures adsorption spectrum and activity of the catalyst. In this paper, detailed design of the cells and their initial applications are presented.
Adsorption from Binary Liquid Mixtures on the Zeolite Na Y and Na X
Moon, Sei-Ki ; Yoo, Kyong-Ok ; Kang, Shin-Choon ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 131~131
The relations between the mole fraction and the activity coefficient in the adsorbed phase were obtained from the thermodynamic analysis on the adsorption equilibrium of liquid mixtures. The adsorption equilibrium data of the liquid mixtures, benzene-cyclohexane and toluene-cyclohexane, on the zeolite Na Y and Na X were measured at
. The activity coefficients in the adsorbed phase, calculated from the adsorption equilibrium data, were thermodynamically consistent. It was found that the amout of preferentially adsorbed molecules could be calculated from the experimental adsorption equilibrium data.
Reaction of the System
Choi, Tae-Woon ; Lee, Hong-Lim ; Kim, Chang-Eun ;
Korean Chemical Engineering Research, volume 19, issue 2, 1981, Pages 139~139
The pellets of the
system were heated at
in the atmospheres of
systems, respectively. X-ray diffraction analysis showed that
and X-phase were formed after the reaction at
in both the atmospheres. The porosities of the heated specimens were measured as low as 15%. It was observed that the
formed in the
system is more stable in the oxidizing atmosphere than that formed in the