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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 22, Issue 6 - Dec 1984
Volume 22, Issue 5 - Oct 1984
Volume 22, Issue 4 - Aug 1984
Volume 22, Issue 3 - Jun 1984
Volume 22, Issue 2 - Apr 1984
Volume 22, Issue 1 - Feb 1984
Selecting the target year
A Study on the Heat of Adsorption at Gas-Liquid Interface
Shin, Jeong-Ho ; Jeong, Kab-Seob ; Lee, Sung-Sik ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 167~167
In order to investigate the heat of adsorption at the interface between surface phase and bulk liquid of sodium lauryl sulfate and sodium dodecylbenzene sulfonate in the bubble-foam adsorptive separation, two equations were derived from the batch analysis around the overhead flow of the batch bubble adsorptive separation under the assumption of ideal solution and monolayer. Using the experimental data obtained from the batch operation below the concentration of
sodium lauryl sulfate and sodium dodecylbezene sulfonate respectively, the heat of adsorption were calculated by two equations. The heat of adsorption calculated by the equation, which was derived considering the bulk liquid accompanied by the bubbles, was constant within the range of experimental concentration and was coincided with the value calculated by surface excess.
A Study on the Formation of Xylene from Toluene and Methanol over Y-zeolite Catalysts
Kwak, Jong-Woon ; Lee, Ho-In ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 173~173
Toluene has been alkylated with methanol over Y-zeolite catalysts to produce p-xylene. The experiment was carried out continuously over fixed bed catalysts under atmospheric pressure. The selectivity for a specific xylene isomer was demonstrated to undergo a remarkable change depending on the experimental conditions such as temperature, space velocity, and reactant ratio in the feed. At thermodynamic equilibrium at
of optimum reaction temperature, the xylene mixture contains about 20% of p-xylene, while in this study the product mixture consisted of 47% of p-xylene. It has been found that HX-zeolite has a high selectivity and HY-zeolite a high activity, whereas both HM-zeolite and silica-alumina have low activities The optimum reaction conditions were as follows; reaction temperature of
, toluene/methanol mole ratio of 2, and space velocity of 0.48l/gr-cat/hr. At relatively high reaction temperatures, Y-zeolite catalysts produced the mixture of xylene which composition corresponds closely to thermodynamic equilibrium values. The main products were xylene, trimethylbenzene, and benzene. The products were analyzed by gas chromatography. As a promoter,
were added to the main catalysts in order to understand the effect of supports on the formation of xylene. When the content of
supported on HY-zeolite was 2wt%, the yield of p-xylene was increased from 8.6% to 13.7%. For
, with 5wt% of
the yield of p-xylene was increased from 8.6% to 13.8%. In order to know the effect of
acid on the yield of p-xylene, HCl was added to HFeY catalyst. As the content of p-xylene was 6wt% with respect to methanol, the yield of p-xylene was increased from 15.7% to 19.7%.
Sulfidization of Titaniferous Magnetite with Sulfur Dioxide in the Presence of Carbon (II)
Park, Yong-Sung ; Lee, Chul-Tae ; Ryoo, Young-Hong ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 181~181
The reactions in
system and in titaniferous
system were examined to select a reducing agent that is practicable for industrialization of the sulfidization process of titaniferous magnetite with sulfur dioxide. Anthracite, charcoal, coke and activated carbon were used as a reducing agent in this study. As a result, charcoal and activated carbon were prefered reducing agent to anthracite and coke. The optimum reaction temperature was
when charcoal was used as a reducing agent and was
when activated carbon was used as a reducing agent under the conditions of reaction time 1h, weight ratio of added reducing agent to titaniferous magnetite 0.7 and
flow rate 100 cm/min（reactor size: ID=2.8 cm, length=100 cm).
The Roles of Promoter on the Activity and the Deactivation of HCrY-Zeolite Catalysts
Sohng, Kee-Ho ; Lee, Ho-In ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 189~189
The roles of promoter in HCrY-zeolite catalysts have been studied in the vapor phase isomerization of ethylbenzene to xylene. As a promoter, one of alkali metals（lithium, sodium and potassium） or one of alkaline earth metals(magnesium, calcium and strontium) was added to an HCrY-zeolite catalyst containing Pt 0.5wt% and
1.07wt% in order to increase the catalytic activity and to decrease the rate of coke deposition which causes catalytic deactivation. The experiments were carried out at
of reaction temperature, 18atm of reaction pressure, 5.9 of
mole ratio, and 1.62gr-feed/hr gr-cat of LWHSV (Liquid Weight Hourly Space Velocity). For the magnesium-promoted HCrY-zeolite catalysts, total conversion exhibited a maximum and selectivity for cracking a minimum. The yield of 27% for isomerization was obtained using HCrMgY-6mole%Mg-zeolite. For the HCrMgY-zeolite, the best catalytic activity was shown with the ion-exchanged order of Cr and then Mg, but not with Mg and then Cr nor simultaneous exchange. The results were explained in terms of the change in catalytic acidity due to the change of polarizing power caused by the addition of promoters.
A Study on the Oxygen Transfer in the Wetted-Wall Column
Doh, Kap-Soo ; Lee, Seung-Yong ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 197~197
The effect of temperature and liquid flow rate in the mass transfer of oxygen to liquid water in the wetted wall column was studied. The over-all liquid phase mass transfer coefficient were calculated from the experimental data. The runs were made over a limited range of Reynolds number 220 to 540 and temperature
. As a result of this study: 1. The effect of temperature on over-all liquid phase mass transfer coefficient was obtained as follow.
2. The dimensionless correlation of the experimental data in the wetted wall column was obtained as follow.
Production of Furfural from Rice Straw by Microbial Treatment (II) - Production of Furfural from Xylose by Acid Treatment -
Kim, Woo-Sik ; Yoo, In-Sang ; Kang, Sin-Keun ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 205~205
This study is the second step on the production of furfural from rice straw by microbial treatment, based on the first research（HWAHAK KONGHAK, Vol. 21, No. 5, Oct., 1983）. The reaction condition and mechanism of furfural production from xylose by acid treatment have been studied. The xylose was obtained from rice straw by the first step research. Furfural yield at batch-isothermal condition was a function of initial xylose concentration, sulfuric acid concentration, reaction temperature, and reaction time. And when the initial xylose concentration was low, the results were consistent with those of Root's reaction mechanism. Maximum furfural yield was obtained under conditions of sulfuric acid concentration, 0.2N, initial xylose concentration 0.0067gmol/L, reaction temperature
, and reaction time 10 minutes.
Production of Citric Acid in Fluidized-Bed Batch Reactor System
Lim, Dong-Joon ; Choi, Cha-Yong ;
Korean Chemical Engineering Research, volume 22, issue 4, 1984, Pages 213~213
Immobilized yeast cell(Candida lipolytica MX 9-11 R3) was prepared by entrapping the whole cell in calcium alginate matrix. The fermentative production of citric acid from glucose was studied using this immobilized yeast cell in a fluidized-bed batch reactor. One could more or less prevent the cell growth using glucose as the sole nutrient and thus eliminating other nutrients necessary for the cell mass doubling. The productivity of citric acid was remarkably influenced by reaction temperature, pH, and air flow rate in fluidized-bed batch reactor. The optimal conditions for the citric acid production were found to be
and pH 6 as compared with those of homogeneous case, i.e.
(Nakanishi), and pH 5(Marchal), pH 6.5(Nakanishi). The increased air flow rate resulted in an enhanced citric acid production possibly due to the increased dissolved oxygen concentration and the decrease in mass transfer resistance. The intentional addition of
gas into the air supply to the fluidized-bed batch reactor gave a better citric acid productivity in certain concentration ranges. The optimal
content was found to be 16%(v/v).