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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 30, Issue 6 - Dec 1992
Volume 30, Issue 5 - Oct 1992
Volume 30, Issue 4 - Aug 1992
Volume 30, Issue 3 - Jun 1992
Volume 30, Issue 2 - Apr 1992
Volume 30, Issue 1 - Feb 1992
Selecting the target year
Product Recovery from Plastics Pyrolysis -I. Pyrolysis of PS, HDPE and ABS-
Ghim, Young-Sung ; Cho, Sung-Ho ; Son, Jae-Ek ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 261~261
Ten grams of PS, HDPE, or ABS contained in a tray-type sample holder were pyrolyzed in the nitrogen atmosphere in order to investigate the recovery of gas and oil from plastics pyrolysis. Preferably, temperatures higher than the temperature at which the rate of product generation was maximum during heating the sample, could result in both higher rate and larger amount of oil recovery. Yields of gas and oil depended more on the molecular structure of the sample than on the experimental conditions. Degradation of PS proceeded on the monomer base so that only a little gas was produced while the aliphatics of HDPE were easily decomposed to gaseous components of low molecular weight.
Characteristics of Dynamic Microfiltration using Rotating Membrane
Park, Jin-Yong ; Choi, Chang-Kyun ; Kim, Jae-Jin ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 268~268
In this study characteristics of dynamic filters using Taylor vortices are investigated. Filtration experiments are conducted with silica slurry and filtrate fluxes are analysed on the basis of the Taylor number and the rotational velocity of the membrane filter by dividing them into two regions: the transient state and the pseudosteady state. During the transient period the initial variation of the filtrate flux to filtrate volume is found to decrease linearly with increasing the Taylor number, while the filtrate flux at the pseudosteady state is found to increase linearly with increasing the rotational velocity of membrane. Based on these results, empirical correlations to represent filtration characteristics are provided.
Synthesis of Polysiloxane from Industrial Water Glass
Kang, Young-Shik ; Kim, Won-Duck ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 277~277
The structure and characteristics of the silylates prepared from industrial water glass were studied. The structures of the silylates were apparently showed differences by the silylating agents: linear trimethylpolysiloxane was produced from trimethylchlorosilane, two-dimensional dimethylpolysiloxane from dimethyldilchlorosilane, two-dimensional H-methylpolysiloxane from dichloromethylsilane, and finally three-dimensional methylpolysiloxane from methyltrichlorosilane. Trimethylpolysiloxane was soluble in tetrahydrofurane or tetrachlorocarbon, but dimethylpolysiloxane and H-methylpolysiloxane slightly soluble in these solvents, and methylpolysiloxane was not soluble. Each polymer, white amorphous granule has about 13,000 molecular weight, about melting point
, and about
The Study on the Crystallization Rate of ZSM-5 Zeolite
Seo, Gon ; Chung, Kyeong-Hwan ; Park, Tae-Jin ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 285~285
Crystallization process of ZSM-5 zeolite from dilute silicate-aluminate solution was studied. Crystallization curves, pH change of reactant, and size distribution of final product were examined at
. The crystallization curve can be simulated adopting optimum rate constant for linear growth, if the crystal is growing from nuclei formed during induction period with the constant growth rate and the fraction of soluble species is constant till all amorphous reactant is dissolved. The rate constants for linear growth are determined as
Kinetics of Non-Catalytic Steam Gasification of Various Coal Chars under Isothermal Condition
Choi, Young-Kyo ; Moon, Sang-Heup ; Lee, Ho-In ; Lee, Wha-Young ; Rhee, Hyun-Ku ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 292~292
Steam gasification of three different coal chars and activated carbon has been carried out in a fixed-bed reactor under the conditions of
and 0.1-0.7 atm of steam. Three sample coals are Korean Jangsung anthracite, Chinese Tatong bituminous and Indonesian lignite. The gasification rate, estimated from G.C. analysis of the product gases, increases initially in parallel with the surface area of the reacting char, reaching the maximum when the carbon conversion is about 5-15%. Mechanism of the char gasification is well represented by the undreacted shrinking-core model. Chars of the lower-rank coals exhibit relatively fast gasification rates at low temperatures, but the bituminous coal char shows a significant increase in the gasification rate at higher temperatures. The
molar ratios among the products and the activation energy of CO formation decrease with increasing rank of the sample coals.
Surface Properties of Random Copolymer Containing Perfluoroalkyl Ethyl Acrylate
Park, In-Jun ; Lee, Soo-Bok ; Koh, Jae-Cheon ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 303~303
Perfluoroalkyl ethyl acrylate(FA) copolymers were prepared by solvent polymerization using FA mixture, stearylmethacrylate and vinylidene chloroide as comonomers. A film of FA copolymer was formed on a slide glass, and its surface properties were analyzed by measuring the contact angles with DCAA(Dynamic contact Angle Analyzer). the solid content of FA copolymer in the copolymer cating solution used to prepare the film of FA copolymer should be above 0.08wt%. The oil repellency of FA copolymer is more dependent upon the FA content of FA copolymer than the water repellency. The critical surface tension of FA copolymers varies sensitively with FA content. The critical surface tension of FA copolymers, whose FA content is in the range of 40-60wt%, shows a value between 18.0 and 8.2 dyne/cm. Young-Fowkes equation and Young-Kaelble equation are suitable for the prediction of surface energy of FA copolymer. The surface energy of FA copolymers consists of mainly dispersion component.
Ethanol Production by Sugars Derived from Dahlia Pinnata Tubers
Kim, Kwang ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 310~310
This study examines the potential of dahlia pinnata as an alternative energy source for ethanol. Experimental results are presented as batch fermentation kinetics for two strains of Kluyveromyces fragilis CBS 1555 and Saccharomyces cerevisiae ATCC 4126 grown on the extract derived from the tubers of Dahlia pinnata. In the first extraction stage, the range of sugar conentration was
in terms of total sugars. Saccharomyces cerevisiae cells were immobilized in Ca-alginate beads and used in a packed-bed bioreactor for the continuous production of ethanol from the extract of dahlia pinnata tubers. Ethanol yield varied from 0.92g-EtOH/g-Sugar utilized at
to 0.57g-EtOH/g-Sugar utilized at
. The results presen-ted in this study show that immobilized cells of S. cerevisiae have a high potential for fuel ethanol production from Dahlia pinnata tubers. the immobilized cell bioreactor was operated continuously at a constant dilution rate of
for 35 days. The maximun ethanol yield was found to be 0.98g-EtOH/g-Sugar.
Synthesis of Heat Exchanger Network by Optimizing the Minimum Temperature Difference
Kim, Sang-Woo ; Lee, Hae-Pyung ; Pek, Un-Hua ; Park, Sun-Won ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 318~318
A new methodology for the synthesis of optimum heat exchanger network has been developed. This method is based on the work by Linnhoff and Ahmad which determines the optimum minimum temperature difference(
) based on the energy and capital cost target before the synthesis of the heat exchanger network. The proposed method uses the Guthrie's model for capital cost calculation, cuts down the capital cost according to control of the driving force between hot and cold streams, and handles the match constraints for the intangibles of design such as safety, layout and etc. The software system developed in this study was applied to the Alko process, which is an alcohol production process, for the synthesis of heat exchanger network. It was possible to save about 12% of the total annual cost.
The Study on Raney Ni Used as the Catalyst of Hydrogen Electrode in Alkaline Fuel Cell
Cho, Won-Ihl ; Cho, Jeong-Yoon ; Kim, Hyung-Jin ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 328~328
Ni with a small average particle size and apparent density showed a good catalytic activity, and Raney Ni prepared from these Ni powders also exhibited an excellent catalytic activity. It was found that the best preparation temperature of Raney Ni catalyst was about
. For the chemisorption of CO and the hydrogenation of benzene, the optimal weight ratio of PTFE-binder to Ni and Raney Ni was 10wt% and 5wt%, respectively. For electrode reaction experiments, however, 10wt% PTFE-bonded Raney Ni hydrogen electrode showed the best electrode performance. The catalytic activity of Raney Ni was considerably affected by the treatment of
Degradation of Polyvinyl Alcohol in Wastewater by Pseudomonas sp. Immobilized on Celite
Seong, Kee-Dal ; Kim, Jeong-Mog ; Cho, Moo-Hwan ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 339~339
The aim of this study is to treat efficiently PVA-containing wastewater. PVA is known as one of poorly biodegradable materials. As a microbial immobilization support, celite was used in the air-lift reactor. The PVA removal efficiency was 91.6% at 2g PVA/L day of PVA volume loading and at 24hr retention time, when F/M ratio was 0.13g PVA/g cell day. At the same retention time, an increasing rate of PVA removal efficiency was decreased with increasing concentration of microorganism in the reactor, and at the same concentration of microorganism, PVA removal efficiency was approximately constant when PVA concentration of influent was more than 2g/L. At the same PVA volume loading, treating wastewater of low concentration at short period resulted in lower PVA concentration in effluent than treating wastewater of high concentration at long period with respect to the effluent PVA concentration, even though the removal efficiency of the former was lower than that of the latter. Specific PVA removal efficiency increased proportionally with specific PVA loading up to 0.7g PVA/g cell day. PVA removal rate constant, K was 0.069L/mg/hr. PVA removal efficiency could be expressed as follows.
Adsorption of Solute on Pitch-based Activated Carbon Fiber from Aqueous Solution
Kim, Young-Ok ; Ko, Kyung-Ryeol ; Park, Young-Tae ; Ryu, Seung-Kon ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 347~347
Isotropic pitch based carbon fibers have been activated at different levels of burn-off by stema diluted in nitrogen. There is a slight uptake of
at 273K indicating that some microporosity is already present in the unactivated fiber. these micropores are, however, unaccessible to
at 77K. The specific surface area and the micropore volume of carbon fiber were increased significantly upon activation, however after 60% burn-off, the micropore volume measured by D-R equation levels off where as the one determined by the
s-method steadily increase with the extent of activation. The adsorption of iodine and the decolorization of methylene blue of activated carbon fiber from aqueous solution were excellent, especially adsorption rate was greatly fast. The adsorption capacity was enhanced with the burn-off increasing, but it was also dependent on micropore size distribution.
Simulation of Fluidized Bed Coal Gasifier
Bak, Young-Cheol ; Yang, Hyun-Soo ; Son, Jae-Ek ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 357~357
The numerical analysis for the 7.5cm I.D. atmospheric lab. scale fluidized bed coal gasifier was conducted with the bubble assemblage model for gas, the population balance model for solid, and the basic coal gasification kinetic equation in the form of power law. The mole percent of
in the product gas was 10-30%, that of CO was 5-20%, that of
was 6-12%, and that of
was 2-4% with variation of the simulation condition such as temperature(
), air flow rate(1.5-5.0 kg/hr-air/kg/hr-char), and steam flow rate(0.5-2.5 kg/hr-steam/kg/hr-char).
Relationship between Chemical Properties of Korean Anthracite Coals and Combustion Characteristics
Lee, See-Hoon ; Park, Cheol-Woo ; Shon, Eung-Kwon ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 368~368
A detailed investigation has been reformed on the thermal characteristics of 28 Korean anthracite coals. The proximate, ultimate and marceral constituents characterizing their chemical and petrographic properties were analysed. The coals were partitioned into four groups in accordance with the linearity of Arrhenius plots and the weighted mean activation energy were calculated. By examining the data obtained, it was possible to show the existence of good correlations between the VM/FC, (C+H)/O and C/H, but it was not possible to detect particular trends with regard to PT(Peak Temperature) and BT(Burn-out Temperature) deduced from burning profiles. It was found that the PT and BT cannot be used as an indices to describe the combustion characteristics of coals having identical rank(especially for anthacite). For the whole set of coals, telocollonite belonging to vitrinite marceral group has the highest correlation coefficient with activation energy. Although both the telocollonite and the desmocollinite belong to vitrinite marceral group, each marceral exert opposite effect on activation energy and the activation energy increased as the total inertinite contents increased. The differences in sulfur content, VM/FC ratio, marceral and activation energy in each groups are compared by using the frequency distribution analysis.
Extraction of Hazardous Chemicals from Soil Using Supercritical Fluids
Hong, Min-Sun ; Kim, Sun-Wook ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 379~379
Among various processes to remove hazardous chemicals in soil or soil waste materials the supercritical fluid separation process has been selected to extract o-dinitrobenzene contaminated in soil. The effects of entrainers, flow rate and temperature on separation efficiency have been investigated using pure
and mixtures containing 5wt% of acetone or methanol as entrainers. A mathematical model has been proposed to calculate the residual concentration of o-dinitrobenzene in soil, which agrees well with the experimental data.
Hing Pressure Binary Phase Equilibria of Carbon Dioxide-Tetralin System
Byun, Hun-Soo ; Kim, Choon-Ho ; Kwak, Chul ;
Korean Chemical Engineering Research, volume 30, issue 3, 1992, Pages 387~387
High pressure binary vapor-liquid equilibria of carbon dioxide-tetralin system is investigated by using circulation type experimental apparatus which adopt microsampling technique with expended volume measuring system. The apparatus with this analyzing technique was tested by comparing the measured vapor-liquid equilibrium data of carbon dioxide-tetralin at 344.2K with those of Prausnitz et al. The binary phase equililbrium data of carbon dioxide-tetralin was obtained at temperatures of 313.2K and 373.2K in addition to that of 344.2K and pressure from 5-6MPa to near mixture critical pressure. The mixture density data are also obtained by calibrating the accurate volume of sampling loops. The solubility of carbon dioxide in liquid phase decreases and the solubility of tetralin in vapor phase increases as the temperatures increases at constant pressure.