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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 24, Issue 6 - Dec 1986
Volume 24, Issue 5 - Oct 1986
Volume 24, Issue 4 - Aug 1986
Volume 24, Issue 3 - Jun 1986
Volume 24, Issue 2 - Apr 1986
Volume 24, Issue 1 - Feb 1986
Selecting the target year
The Hydrodynamic and Mass Transfer Characteristics of Para-type Plate Pulsed Extraction Column(I)
Kim, Woo-Sik ; Youm, Kyung-Ho ; Yoon, Jang-Hyo ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 335~335
The hydrodynamic and mass transfer characteristics in the para-type plate pulse column was investigated. The axial dispersion coefficients of continuous phase and the hold-up of dispersed phase were more influenced by the continuous and dispersed phase velocity than by the pulse velocity respectively. As the experimental results of acetone extraction, the column efficiency slightly decreased with the increase of pulse velocity, but the efficiency was stabilized in the range of 80-90%. And the acetone concentration profiles at steady state approached to the backflow model.
Hydrodealkylation Reaction of Ethylbenzene over Nickel-Supported Catalyst
Moon, Jeon-Soo ; Ahn, Chai-Hyun ; Song, Yo-Soon ; Seo, Gon ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 343~343
The hydrodealkylation reaction of ethylbenzene over nickel or nickel-tungsten supported catalysts was studied in a flow reactor system. Toluene was a major product at
over nickel supported catalyst and the conversion of ethylbenzene and the selectivity of benzene increased at higher temperature. Above
, methane hydrocracked from aromatic ring was only produced. The product distributions of m-xylene with reaction temperature were similar to those of ethylbenzene. The hydrocracking of aromatic ring of ethylbenzene was restrained at
over nickel-tungsten supported catalyst. When tungsten was added to nickel supported catalyst, decrease of catalytic activity and increase of selectivity for benzene were observed. The electron energies of supported nickel and tungsten, observed in Auger electron spectra were varied with the composition of supported material. The reversible adsorption heat of benzene determined at the range of
decreased with increasing the content of tungsten. The increase in the selectivity for benzene due to the co-impregnation of tungsten might be explained in terms of the reduction of catalytic activity for hydrocracking reaction with decrease in the adsorption strength of benzene on the catalysts by the interaction between supported nickel and tungsten.
Acid Catalyzed Hydrolysis of Wood Cellulose Containing Small Amount of Water and Counter-Current Extraction of Produced Sugars
Song, Seung-Koo ; Lee, Min-Gyu ; Lee, Yoon-Yong ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 351~351
The experimental analysis of hydrolysis of wood cellulose containing small amount of water at moderate sulfuric acid concentration showed that the hydrolysis of wood cellulose could be modeled by consecutive irreversible first order reactions. The kinetic parameters were evaluated covering the conditions of
and 4.4-12.2% sulfuric acid. Results showed that the sugar yield and concentration would increase with reaction temperature and acid concentration. Batch hydrolysis of lignocellulose containing small amount of water under varying temperature schemes was found to be efficient in obtaining a concentrated glucose solution, thus potentially reducing the heat input in the subsequent fermentation process. This scheme provided 62 to 64% yield as well as a glucose concentration of 22%. The concentrated glucose solution trapped within biomass structure could be extracted without significant dilution using counter-current leaching system.
Effect of the Particle Size Distribution of the Charging Coal on Coke Strength in Carbonization
Lyoo, Pil-Jo ; Kim, Je-Young ; Yoo, Eun-Jae ; Kang, Suk-Ho ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 361~361
In order to improve the coke strength resulting from the coke manufacturing process of the bituminous coals, the particle size distribution and blending ratios of the various raw coals having different coking strengths were adjusted before charging the blended sample coals into cokes oven. The average strength,
, of the sample cokes produced can be improved by adjusting the maximum ratio of the charging coal, Fi, and coarser fraction, Pi, retained on the 3 mm sieve screen, as well as the maximum fluidities, MFs, of the various raw coals blended in. The coke strength could be improved by maintaining the term.
to the minimum value, as far as possible in practice.
Gas Holdup and Volumetric Mass Transfer Coefficient in a Bubble Column with Draft Tube
Kang, Yeon-Seung ; Kim, Jong-Won ; Lee, Won-Kook ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 371~371
The flow pattern and oxygen transfer characteristics were studied for laboratory concentric tube air-lift reactor with air-water system. The mixing time, circulation time, gas holdup, and overall mass transfer coefficient were measured according to change of dispersion type, riser-to-downcomer cross sectional area ratios, and air flow rate. Some correlations were obtained to express the effects of variables on gas holdup and mass transfer coefficient. Overall gas holdup and mass transfer coefficient in the type of gas dispersion into annulus were found to be larger than those in case of the type of gas dispersion into draft tube.
Nitrification of Synthetic Wastewater using Biological Fluidized Bed
Jung, Woo-Chul ; Kim, Hwan-Gi ; Lee, Bok-Yul ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 381~381
A basic study is done on the biological nitrification for the removal of nitrogenous components from synthetic wastewater. The composition of synthetic wastewater is similar to a typical septic tank effluent containing a considerable amount of nitrogenous compounds. As nitrification process is supposed to be step reactions, 4 Biological Fluidized Bed Reactors are prepared. Thus the feasibility of this nitrogen treatment is discussed as follows. The results obtained showes that as the nitrification process proceeded, 88 to 97% of the
was removed in the latter stages. Thus the 4 stage Fluidized Bed Reactors proved to be very good in nitrification. The flow pattern resulted in the complete mixing in each stage when the recycle ratio was about 30. The kinetic analysis of the nitrification reaction showed that the organic removal rate was faster than the nitrification rate by three times, and the kinetics of microorganism formation by oxygen is discussed also.
Effect of Cesium-additives on Molybdena-Alumina Catalyst (II)
Mun, Se-Gi ; Kim, Hyeong-Jin ; Im, Dae-Jae ; Seo, Gyo-Taek ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 391~391
The effect of cesium-additives on molybdena-alumina catalyst has been studied using temperature-programmed desorption(TPD) of pyridine and temperature-programmed desorption with decomposition (TPDE) of isopropyl alcohol. The desorption energy of pyridine was increased significantly with the addition of small amount of cesium (ca. Cs/Mo=0.41) and was nearly constant thereafter. The result of TPDE study supported the above phenomena and showed that presence of cesium does not lead to change the rate-determining steps in isopropyl alcohol-decomposition reaction. These results are consistent with the surface model of molybdena-alumina catalyst.
with Ammonium Sulfate(II)
Park, Yong-Seong ; Lee, Cheol-Tae ; Yu, Yeong-Hong ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 399~399
The reaction of
was studied. These reactions were carried out in the boat-batch system under air atmosphere with such variables, reaction temperature, mole ratio of
, reaction time, particle size of
and air flow rate. The proper conditions for the reaction were that reaction temperature
, mole ratio of
10.0, reaction time 2h, and particle size of
-200mesh. Under those conditions, conversion of
to Ammonium Aluminum Sulfate was 98.92%.
Hydrolysis of Cellulose by Enzyme Mixture
Kim, Dong-Won ; Yang, Jae-Ho ; Jung, Young-Guy ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 407~407
To enhance the activity of
in enzyme system from Trichoderma viride, the cellulase from Trichoderma viride and Aspergillus niger were mixed and various celluloses were hydrolyzed by using the mixed cellulase. The mixed enzyme had an effect on hydrolysis of the cellulosic materials more than cellulase from Trichoderma viride. The saccharification percentages of microcrystalline and noncrystalline cellulose after 48 hr hydrolysis were 53 and 85% respectively. These saccharification values were 1.32 and 1.15 times as high as those of cellulase from Trichoderma viride.
A Study on the Activities of Y-Zeolite Catalysts in Alkylation of Toluene
Kwak, Jong-Woon ; Ko, Seong-Oon ; Lee, Wha-Young ; Sung, Buick-PaJung ; Lee, Ho-In ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 415~415
The activities of Y-zeolite catalysts were studied in alkylation of toluene with methanol to produce xylene isomers. The experiments were carried out continuously over fixed bed catalysts and reactants were fed by a micropump. The amount of total xylene decreased with time-on-stream, while the selectivity of p-xylene increased. In order to reduce the deactivation rate, catalysts were treated with water vapor or strong acids. It has been found that the modified catalysts by treatment show higher activities and lower deactivation rate than the corresponding untreated catalysts. It has also been shown that the distribution of xylene isomers is dependent on the concentration of
acid of the catalysts employed. Moreover, the formation of m-xylene increased when the catalysts were treated with strong acids.
Oxygen-Nitrogen Separation Characteristics of Poly(dimethylsiloxane)-Polysulfone Thin Film Composite Membranes
Song, Seung-Won ; Kim, Jae-Jin ; Kim, Un-Young ;
Korean Chemical Engineering Research, volume 24, issue 5, 1986, Pages 423~423
Thin film composite (TFC) membranes for the oxygen enrichment were prepared. Poly(dimethylsiloxane) was used as a coating material and polysulfone was utilized for a porous support membrane. The thickness of the coated layer was
and that of the porous polysulfone support membrane was about
. The permeabilities of oxygen, air and nitrogen increased linearly with the increase in the pressure difference (
) but the selectivity was independent of the pressure difference. The effects of the operating parameters (pressure ratio
) on the air separation were investigated for the different mixtures of oxygen and nitrogen as the feed stream. The extent of the oxygen enrichment increased with the decrease of the pressure ratio and cut. Oxygen was enriched upto 28% in the permeate stream under the condition such that the values of pressure ratio, cut and oxygen mole fraction in the feed stream were 0.171, 0.01 and 0.21 respectively. The ideal separation factor (
) of this TFC membrane was 2.03 and the permeability of oxygen was