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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 41, Issue 5 - Oct 2003
Volume 41, Issue 6 - 00 2003
Volume 41, Issue 4 - 00 2003
Volume 41, Issue 3 - 00 2003
Volume 41, Issue 2 - 00 2003
Volume 41, Issue 1 - 00 2003
Selecting the target year
Catalytic Cracking of Naphtha into Light Olefins
Park, Yong-Ki ; Jeon, Jong-Yeol ; Han, Sang-Yun ; Kim, Jeong-Ri ; Lee, Chul-Wee ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 549~557
In the whole world, the amount of
emission from the ethylene plant is about 141 million tons per year, and currently about 40% of the energy in petrochemical industry is used for steam cracking of naphtha. So, global warming issues have stimulated the development of new cracking process of naphtha which can minimize
emission through the increase of energy efficiency. Also there is an effort to increase the ratio of propylene/ethylene in naphtha cracking since the natural gas cracker which can produce ethylene preferentially increases more and more. Therefore, catalytic cracking of naphtha has been studied as an alternative of thermal cracking to balance ethylene and propylene demand and to reduce
emission. This paper will review the various routes which have been investigated and applied over the past years, but will focus particularly on the recently patented and commercially demonstrated processes for the production of lower olefins from naphtha.
Kinetic Study of the Reverse Water-Gas Shift Reaction over
Catalyst at Low Temperature
Yang, Jung-Il ; Park, Jong-Ho ; Kim, Jong-Nam ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 558~563
The kinetics and reaction mechanism of the reverse water-gas shift reaction (RWGS) over
catalysts were studied using a differential reactor. The experiments were carried out at 523 K and 2.9-5.7 atm. Effect of reactants composition on the reaction rate was checked by changing
. When the
were low, the reaction rate was dependent on partial pressures of both reactants and there was a strong dependency on
. At high
, reaction order with
was zero, and order with
was 0.23. The data was analysed using rate equations based on power law, Langmuir-Hinshelwood mechanism, and surface redox mechanism in which Cu was considered as an active site. The reaction rate derived from surface redox mechanism matched well with the reaction rate derived from power law, and the calculated
values, based on surface redox mechanism, was in good agreement with the experimental values. Also, a linear relationship between
and reaction rate indicated that the surface redox mechanism was operative under these conditions. Therefore, it was conclued that the RWGS at 523 K proceeds by surface redox mechanism via oxidation and reduction of the Cu active site.
Selective Oxidation of CO in Hydrogen Rich Stream over
Catalysts Doped with Co: (II)
Park, Jong-Won ; Rhee, Young-Woo ; Jeong, Jin-Hyeok ; Lee, Deuk-Ki ; Park, Yong-Ki ; Yoon, Wang-Lai ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 564~571
promoted with 0.2 wt.% Co were prepared and their catalytic performance was evaluated for the selective oxidation of CO in a
condition (1 vol.% CO+1 vol.%
were present in the reformed gas feed, both
showed decrease in oxidation activity of CO at low temperatures especially under
. Compared with the
, however, the
showed higher resistance for the
and also there existed a temperature window of
from 210 to
corresponding to the conversion of 99.9% CO. From
, it can be concluded that the main cause for the decrease in catalytic activity may be attributed to the blockage of the active sites by competitive adsorption of water vapor and
with the reactant at low reaction temperatures.
A Study of
Catalytic Reaction for the Recovery of Elemental Sulfur from
Kim, Bong-Suk ; Lee, Jong-Dae ; Park, No-Kuk ; Ryu, Si-Ok ; Lee, Tae-Jin ; Kim, Jae-Chang ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 572~576
The catalytic reduction of
to elemental sulfur with CO over
was studied. The
catalysts were prepared by changing the Ce/Zr mole ratio (x=1, 0.8, 0.5, 0.2, 0). The reactivity of
in accordance with experimental conditions, such as reaction temperature (
), space velocity (
) were investigated. The conversion of
and the selectivity to elemental sulfur in the recovery of elemental sulfur from
catalysts were respectively about 93% and 98% at temperature about
, which were superior to other catalysts. It seems that the reactivity is influenced by the Ce/Zr mole ratio. From these results, it was concluded that the oxygen mobility of catalysts was increased with inserting the Zr. Because the reduction of lattice oxygen and reoxidation of Ce-based catalysts was improved by the adding Zr, it is possible to improve the redox characteristic.
Application of CAE in Injection Molding Process
Kim, Beom-Ho ; Jang, Woo-Jin ; Kim, Jung-Hoon ; Cho, Jung-Hwan ; Park, Yung-Hoon ; Choe, Soon-Ja ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 577~584
Injection molding process is influenced by the injection conditions such as various thermal history and deformation processes that affect mechanical properties of the fabricated product. The design of the 29-inch TV backcover modified with the alteration of the thickness of special parts. Then the flow analysis was performed using the CAE S/W of the Mold Flow Company. In addition, the analysis was performed using the measured viscosity(local database) at various shear rates and the results were compared with those using the standard database. In order to reduce the unbalanced flow of the molten resin, the thickness of the part, where the flow speed was slow, increased, while that of the part, where the flow speed was fast, reduced. As a result, the optimum condition based on the above modification of the special part of TV backcover is selected in terms of idealized flow pattern. In addition, the analyses based on the local database and the standard database showed no distinctive difference, although the measured viscosity was slightly higher and the temperature distribution was broader than by the standard database.
Fault Detection and Diagnosis in Film Processing Plants
Yoon, Dong-Myung ; Lee, Young-Hak ; Han, Chong-Hun ; An, Hun-Sung ; Chang, Sa-Yun ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 585~591
The fierce competition in the polymer film and sheet market requires the industry to satisfy much higher product quality specifications. This paper proposes a monitoring and diagnosis method based on multivariate statistical techniques which help us reduce the amount of off-spec product. The method has been applied to an industrial web forming plant and has proven that process faults such as the leak of polymer fluid can be early detected before it is developed into the production of bad quality product.
Adaptive Block-Wise RPLS Considering Similarity of Blocks
Yun, Kyong-U ; Lee, Young-Hak ; Han, Chong-Hun ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 592~597
Partial least squares (PLS) regression has been effectively used as one of the data-driven empirical modeling to deal with a large number of variables in the complicated covariance structure. But Partial least squares (PLS) regression has limitations in the online model update. Therefore, recursive PLS has been used for the online adaptation of the model. The RPLS algorithm is implemented as soon as some new samples are available. It may be desirable not to update the model until significant amount of data are collected and the process has gone through significant changes. In this paper, we used the block-wise recursive partial least squares (RPLS) algorithms with a moving window for the adaptation of the model according to the process shifts. The block-wise RPLS algorithm has been used to reduce computational load in PLS regression and its cross-validation. In this work we defined the index to represent correlation between blocks and proposed how to determine the forgetting factors through it. This proposed method is to improve the prediction power of the adaptive modeling considering correlation between blocks without general process knowledge. Therefore, this proposed method included correlation information that different methods did not express. The method was tested to process heaters in the oil refining company. We constructed the prediction model of the effluent
composition with forgetting factors and showed that the prediction power approximated more than 95% of the minimum error.
Effects of Rheological Properties of Emulsions having Sunscreening Agent on Sun Protection Efficacy
Park, Chan-Ik ; Kang, Tae-Jun ; Lee, Seong-Jae ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 598~603
The effects of rheological behavior of emulsions depending on vehicle type, thickener content and oil polarity were investigated on the sunscreen efficacy of emulsions having a sunscreening agent. Rubbing procedure of sun-protecting emulsions on human skin was simulated by using rheological variables and the results were compared with monoprotection factors. It was found that the larger the tendency to return to the original structure of emulsion was, the more the protection efficacy against ultraviolet rays was. Change in rheological properties caused by varying thickener content had more effect on the screening efficacy than that by varying oil type. It was confirmed from this study that even the emulsions containing equivalent amount of sunscreening agent could differ in sun protection efficacy and thus the efficacy to protect against ultraviolet rays could be raised by controlling rheological properties of the emulsions without additional use of sunscreening agent.
Dimethyl Ether Production using a Reaction-distillation Hybrid Process
Koo, Young-Hwa ; Han, Myung-Wan ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 604~611
In this study, we propose a new reaction-distillation hybrid process for production of dimethyl ether (DME). The conventional process for the production DME consists of one reactor and two distillation columns. The proposed reaction-distillation hybrid process is an interlinked system between one reactor and one distillation column. Comparison between these two processes shows a great advantage of the proposed one over the conventional one in energy saving. We examine and analyze the effect of design and operation variables on the performance of the proposed process and optimize the process.
Extraction and Purification of Isoflavones from Korean Soybean and Soybean Paste
Lee, Kwang-Jin ; Choi, Du-Young ; Row, Kyung-Ho ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 612~616
In this work, analytical and preparative HPLC systems were utilized to obtain isoflavones from Korean soybean and byproduct of soybean paste. The optimum operating conditions were experimentally determined to analyze and collect the isoflavones in the pretreated extract. The extraction efficiency was the most favorable at aqueous solution of 60% ethanol. Korean soybean was extracted by preparative column with
packings and linear gradient elution mode. Under these experimental conditions, the yield of solid extract was 5%, while the weight percentage of genistin, daidzein, and genistein was 0.2 wt.%. The content of non-glucosides isoflavones in the fermented byproduct of soybean paste was remarkably higher than that in the Korean soybean extract.
Preparation of Nano Size Titania Powders with Monomodal Pore Distribution by the Sol-Gel Method and Hydrothermal Treatment
Kim, Hyun-Tae ; Shin, Sang-Il ; Song, Ki-Chang ; Kang, Yong ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 617~623
Titania powders were prepared from titanium tetra-isopropoxide (TTIP) by a sequence of sol-gel method and hydrothermal treatment. The powders made by sol-gel method followed by hydrothermal treatment exhibited an anatase crystalline phase with numerous nano-size pores. The pore size distribution of the powders prepared by sol-gel method and calcination above
was bimodal with fine intra-particle pores (space between primary particles) and larger inter-aggregated pores (space between secondary particles). The powders by the hydrothermal treatment at
showed a monomodal pore size distribution with only intra-particle pores. The properties of titania powders could be improved by means of hydrothermal treatment considerably; the size could be reduced to 40-50 nm, specific surface area could be increased by 50-100% and the ratio of agglomeration could be reduced by 30-40%.
Minimum Fluidization Velocity and Transition Velocity to Fast Fluidization of Oxygen Carrier Particle for Chemical-Looping Combustor
Ryu, Ho-Jung ; Lim, Nam-Yun ; Bae, Dal-Hee ; Jin, Gyoung-Tae ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 624~631
In order to design and select appropriate operating conditions for the practical operation of chemical-looping combustor, which consists of two interconnected fluidized beds (bubbling fluidized bed and fast fluidized bed), minimum fluidization velocity and transition velocity to fast fluidization were measured and investigated. Oxygen carrier particle of NiO/bentonite particle (specific surface mean diameter: 0.181 mm, particle density:
) was used as a bed material. The minimum fluidization velocity was determined by measuring the bed pressure drop in the pressurized fluidized bed (0.052 m i.d. and 1.66 m high) with variations of temperature (
) and pressure (1-6 atm). The transition velocity from bubbling to fast fluidization was determined by means of emptying time method in the high temperature circulating fluidized bed (0.02 m i.d. and 2.0 m high) with variation of temperature (
). The measured minimum fluidization velocity was increased with increasing temperature and pressure. The measured transition velocity to fast fluidization was increased with increasing temperature. The previous correlations on the minimum fluidization velocity and transition velocity to fast fluidization were compared with the present measured values to develop new correlation.
Influence of Surface Treatment SiC on Thermal Stability and Mechanical Properties of Carbon Fibers-reinforced Composites
Park, Soo-Jin ; Oh, Jin-Seok ; Suh, Dong-Hack ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 632~637
In this work, the effect of chemically wet and dry treatments of SiC was investigated in mechanical interfacial properties of carbon fibers-reinforced composites. The surface properties of SiC were determined by acid/base values, contact angles, and FT-IR analyses. The thermal stabilities of the carbon fibers-reinforced composites were investigated by thermogravimetric analysis (TGA). Also, the mechanical interfacial properties of the composites were studied in interlaminar shear strength (ILSS) and critical strain energy release rate mode II (
) measurements. As a result, the acidically treated SiC (A-SiC) and ozone treated (O-SiC) had higher acid value than that of untreated SiC (V-SiC) or basically treated SiC (B-SiC). According to the contact angle measurements, it was observed that acidic solution and ozone treatments led to an increase of surface free energy of the SiC surfaces, mainly due to the increase of the specific (polar) component. The mechanical interfacial properties of the composites, including ILSS and
, had been improved in the specimens treated by acidic solutions and ozone gas. These results were explained that good wetting played an important role in improving the degree of adhesion at interfaces between SiC and epoxy resin matrix in a composite system.
Nanoparticles with the Solvothermal Synthesis using Ehtylenediamine
Shin, Su-Cheol ; Cho, Tae-Hwan ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 638~642
nanoparticles were prepared with the solvothermal synthesis using ethylenediamine solvent at
for 1-5 h and then annealed in air at from
to 1,400 for 2-4 h. The X-ray diffraction pattern of the crystals annealed at
for 2 h could be indexed as pure cubic cell of
with the lattice parameter
which is very close to the reported value (JCPDS Card File 41-1105,
). Average sizes of prepared phosphor particles had about 100 nm, size and spherical morphology. The phosphor particle size decreased and the emission intensity increased as the annealing temperature increased. Through PL spectrum analysis, the 3% Eu doped
phosphor showed the excitation spectrum at 250 nm wavelength and the maximum emission spectrum appeared at 611nm wavelength.
Gas Holdup and Gas-Liquid Flow Characteristics in a Molten Salt Oxidation Reactor
Cho, Yong-Jun ; Yang, Hee-Chul ; Eun, Hee-Chul ; You, Jae-Hyung ; Kim, Joon-Hyung ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 643~648
Molten salt oxidation is one of the most promising alternatives to incineration that can be used to efficiently destroy the organic components of mixed wastes and hazardous wastes. In this study, the gas holdup and gas-liquid flow characteristics are investigated in the molten salt oxidation reactor (
). Effects of input air velocity (0.05-0.22 m/s) and molten salt temperature (
) on the gas holdup and flow characteristics have been studied. Molten carbonate as the liquid phase and air as the gas phase have been used in this study. The gas holdup increases with increasing molten salt temperature due to the decrease of viscosity and surface tension of molten carbonate. The experimentally obtained gas holdups in the molten salt reactor have been well described and characterized by means of drift-flux model. The gas holdups with variation of the flow regime have been well predicted.
Studies on Textural Properties of Activated Carbon Fibers Containing Silver Metal and their NO Removal Test
Park, Soo-Jin ; Kim, Byung-Joo ; Kawasaki, Junjiro ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 649~654
In this study, the activated carbon fiber (ACF), on which Ag had been introduced by an electroplating technique, was used to remove NO. Surface properties of the ACF were determined by X-ray diffraction (XRD) and scanning electron microscope (SEM).
adsorption isotherms at 77 K were investigated by BET and t-plot methods to characterize specific surface areas and pore volumes, and NO removal efficiency was confirmed by gas chromatographic technique. As experimental results, Ag content on the ACF increased with plating time. However, adsorption properties such as BET specific surface area and total pore volume were somewhat decreased in the presence of silver. NO removal efficiency of all Ag-ACF was higher than that with untreated ACF and increased with Ag content. However, decrease in the extent of NO removal was shown in the excessively plated ACF, which might be associated with the blocking of micropores in the carbon; therefore, an optimal Ag content exists in the presence of initially-well-developed micropores to lead increase in efficient NO removal ability of the ACF.
The Synthesis of Zeolite Using Fly Ash and Its Heavy Metal Adsorption Performance
Roo, Wan-Ho ; Lee, Won-Mook ; Hong, Phil-Sun ; Yang, Chun-Hoe ; Ahn, Jae-Young ; Baek, Il-Hyun ; Lee, Byong-Ro ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 655~660
Zeolite was synthesized from coal fly ash produced by a domestic power plant and has applications in the removal of heavy metal from waste water. Zeolite was synthesized using a hydrothermal method involving an alkaline reaction with NaOH. The NaOH concentration and reaction times were varied in order to synthesize zeolite showing the maximum removal efficiency of heavy metal from waste water. The synthesis conditions were optimized at the concentration of 4M-NaOH and the reaction time of 4hrs. The synthesized zeolite needed washing with HCl solution to improve the removal efficiency of P, Pb, Cd, Cr, Mn and it was maximized at pH 7-9.5 in leaching solution of synthesized zeolite.
Characteristics of Carbonation and Decarbonation of Carbon Dioxide over Calcium Oxide
Roo, Wan-Ho ; Kwon, Tae-Ri ; Lee, Won-Mook ; Lee, Chul-Woo ; Ahn, Jae-Young ; Baek, Il-Hyun ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 661~666
The adsorbent was prepared to separate
gas generated from MSR process. Characteristies of carbonation and decarbonation of the adsorbent have been examine continuous reactor system in respect to temperature, concentrations at contact time. The decarbonation of
onto adsorbents slowly occurred in this the temperature range from
. However, the maximum carbonation ability was obtained at GHSV of
, temperature of
concentration of 10% (
A Study on the Reactivity of Zinc-based Sorbents for Hot Gas Desulfurization using Natural Zeolite as the Support
Park, No-Kuk ; Jung, Yong-Kgil ; Lee, Jong-Dae ; Lee, Tae-Jin ; Kim, Jae-Chang ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 667~674
Two types of zinc-based sorbents using alumina and natural zeolite as the supports for hot-gas desulfurization were prepared, and investigated their desulfurization capability. Their reaction rate and sulfur capacity were compared by Cahn balance and over the fixed bed reactor system at
(sulfidation/regeneration). The attrition resistance was measured by ASTM method. The initial sulfidation rate of ZnO/natural zeolite sorbent was higher than that of ZnO/alumina, and the sulfur capacity of ZnO/natural zeolite sorbent was maintained above 20 gS/100 g sorbent for 10 cycles. A attrition index was 14.7%. The use of natural zeolite as a support of sorbents may be possible for hot gas desulfurization.
Use of Curdlan as an Environmental Friendly Paint Additive
Moon, Chan-Jun ; Lee, Jung-Heon ;
Korean Chemical Engineering Research, volume 41, issue 5, 2003, Pages 675~678
A biopolymer curdlan was used as a paint additive to increase fluidity and pigment dispersion in this study. The color density of paint was increased with curdlan addition and the use of pigment could be minimized as a result. Since curdlan is an environmental friendly material, it can be used for special painting system. When curdlan was mixed with pigment and used for painting system, it helped pigment particles scattered equally in the solution. Therefore, there was no defection on the surface of paint and fluidity of paint was almost same for all the surface. Adequate amount of curdlan for improving paint quality and minimizing curdlan usage was important. The optimal curdlan concentration was 0.5 % (w/w). The surface of painted paper was photographed with SEM (scanning electron micrograph). It showed the pigment was uniformly distributed with the addition of curdlan.