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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 20, Issue 6 - Dec 1982
Volume 20, Issue 5 - Oct 1982
Volume 20, Issue 4 - Aug 1982
Volume 20, Issue 3 - Jun 1982
Volume 20, Issue 2 - Apr 1982
Volume 20, Issue 1 - Feb 1982
Selecting the target year
Methanol-to-Gasoline Process over Zeolite Catalysts
Choi, Ki-Sup ; Kim, Kyung-Lim ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 231~231
The Methanol-to-Gasoline (MTG) Process is based on the Mobil-discovered Zeolite Catalyst(ZSM-5) and is a new and viable route for producing high quality and high octane gasoline from methanol. ZSM-5 class zeolites possess a unique channel structure and the intermediate size of these channels are just wide enough to produce hydrocarbons boiling in the gasoline range. This results in the superior yield of gasoline to that by Fischer-Tropsch process. Another significance of MTG process consists in a new route to gasoline in terms of methanol from non-petroleum such as coal, natural gas and biomass. Consequently this process, which uses much cheaper raw materials, is expected to be promising as oil price rises up.
Redox Reaction between Nitric Oxide and Carbon Monoxide over Perovskite-type Catalysts
Kim, Jae-Jin ; Chung, Suk-Jin ; Choi, Jung-Wook ; Lee, Wha-Young ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 245~245
Perovskite-type catalysts were used for the reduction of nitric oxide with carbon monoxide as an alternative to precious metals, current commercial catalysts, for the neutralization of automobile emission gases. The perovskite-type oxides in the form of
were prepared in the laboratory and their structures were confirmed by X-ray diffraction analysis. The activities of catalysts, redox reaction mechanism, and reaction kinetics were studied in a batch recycle-type reactor.
Isomerization of n-Butenes over Heteropoly Acid Compounds
Kim, Hong-Gon ; Kim, Jae-Jin ; Lee, Wha-Young ; Lee, Jai-Sung ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 255~255
Heteropoly acids and their related compounds function not only as acidic solid catalysts with redox characteristics, but also as catalysts selective to the oxidation reaction lik the formation of methacrylic acid from methacrolein. For the investigation of their catalytic characteristics, the isomerization of n-butenes was studied using the catalysts of 12-molybdo phosphoric acid and its several metal salts. The catalytic activities of heteropoly acid were increased with the injected water vapor, and metal salts prepared with partial exchange of hydrogen ions gave much higher activities.
Deactivation and Selectivity of Zeolite in o-Xylene Isomerization Reaction
Ha, Baik-Hyon ; Lee, Youn-Woo ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 267~267
The deactivation and the selectivity of o-xylene isomerization reaction have been studied on silica-alumina, faujasite-Y and mordenite catalysts. Improving of catalytic stability has been attempted by using two types of treatment; wet air treatment, transition metal loading by ion exchange. Wet air treatment and/or transition metal loading reduced the deactivation rate, but did not change the initial activities on o-xylene isomerization reaction of H-mordenite catalyst. Especially wet air treatment and/or transition metal loading of mordenite catalysts improved the isomerization selectivity. As the deactivation proceeded, the isomerization selectivity was increased on zeolite catalysts. The selectivity of faujasite-Y catalysts is concave to total conversion axis, whereas the selectivity of mordenite catalysts is convex to total conversion axis. On the other hand, the selectivity of silica-alumina showed constant values for total conversion. The isomerization selectivity on cobalt loaded mordenite was higher about 100 times as much as that on faujasite-Y type catalysts at total conversion of about 30%.
Start-up Dynamics for AUC Production in a Recirculation MSMPR Crystallizer
Chang, Kil-Sang ; Park, Myung-Hae ; Chang, In-Soon ; Lee, Chul-Soo ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 275~275
AUC（Ammonium Uranyl tri-Carbonate） was produced in a recirculation MSMPR (Mixed Suspension Mixed Product Removal) crystallizer by reacting uranium solution with ammonia and
, and the start-up dynamics for the precipitation was studied. Generally kinetic equations determined from the steady state crystal size distribution are used with the population balance equation and the mass balance equation to give the transient characteristics of crystallizers. However, when the secondary nucleation effect is predominant as in this study, the birth function needs to be determined from the start-up data. In this study, using the growth function and the birth function determined from experimental data the transient behavior for the starup of the crystallizer was analyzed and compared with experimental results.
A Dynamic Study on an Anthracite Burning Fluidized Bed
Park, Jin-Ho ; Choe, Cheong-Song ; Gang, Ung-Gi ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 283~283
The mixig characteristics of the particles, the combustion behavior and the combustibility of low grade anthracite coal in the fluidized bed were determined. A model, which assumed the main combustion zone located at the upper part of the bed, was proposed and compared with experiments. The mixing of the particles was experimentally studied by employing an impulse tracer technique both for hot combusting bed and for cold bed. Also, the combustion zone was experimentally confirmed by analyzing the temperature changes in the bed after injecting a small amount coal particles to the hot ash fluidized bed. The experimental results on the mixing in the combusting bed were considerably different from those in the cold bed and that could be interpreted by assuming the upward stratification of burning coal particles. Through this investigation, it could be concluded that the proposed model agreed well with the experiments and that the recommendable operation conditions for combusting the low grade anthracite in the fluidized bed would be, the aspect ratio, lower than 1.5; the temperature of combustor, about
; feeding of the coal, at the top of bed; and discharging at the bottom of the bed.
Wastewater Treatment Using a Dual Biological Reactor System
Yoon, Hyon-Hee ; Ghim, Young-Sung ; Chang, Ho-Nam ; Kim, Young-Jun ; Rhee, Joon-Shick ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 293~293
A new dual biological reactor system for wastewater treatment was developed by combining CSTR and PBR. A circular tank of 4.16 liters with a concentric draft tube was used for the first stage and a column of 1.84 liters packed with Raschig rings was vertically attached. By arranging two reactors in one column, it is unnecessary to install a separate sludge settler for recycle. The process was operated with various combinations of four retention times (4, 7, 10, 15 hours) and three organic concentrations (292, 675, 1300mg/liter COD) with synthetic sewage. It was found that the process was capable of removing more than 90% of COD under organic loadings of 1.6 to
. Results for polishing in PBR showed that about 70% of the influent COD from CSTR was removed and the effluent SS was maintained less than 30 mg/liter. The sludge yield was 0.21 to 0.31g SS/g COD removed, an the SVI for an optimum organic loading was in the range 26.2 to 36.6.
Cost Optimization of Raw Material Blending
Kim, Hak-Ryeong ;
Korean Chemical Engineering Research, volume 20, issue 4, 1982, Pages 301~301