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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Clean Technology
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Volume & Issues
Volume 16, Issue 4 - Dec 2010
Volume 16, Issue 3 - Sep 2010
Volume 16, Issue 2 - Jun 2010
Volume 16, Issue 1 - Mar 2010
Selecting the target year
A Patent Analysis on Impurity Removal and Catalysts for Crude Oil Purification
Jo, Hee-Jin ; Moun, Seong-Guen ; Jo, Young-Min ; Chung, Yon-Soo ;
Clean Technology, volume 16, issue 1, 2010, Pages 1~11
As crude oil with heavier and/or highly oxidized components prevails, purification technologies such as desulfurization, denitrilization and demetalization have become important issues to control contents of sulfur and other impurities affecting the quality of petroleum. Also, the importance of catalyst technologies related with crude oil purification has been emphasized to control the production and yield of products. In this paper, technology trends of impurity removal such as sulfur, nitrogen and metal components from crude oil and catalysts related with purification of crude oil were studied through patent analysis. The patents published or registered in Korea, U. S. A., Japan, and Europe from mid 1970's to 2009 had been analyzed based on the application tendency, the distribution of major applicants, and their active indices, etc. The technology flow was figured out to see the technology trends.
Decomposition of Dibenzothiophene Sulfone over KF/MgO Catalysts
Kim, Hyeon-Joo ; Jeong, Kwang-Eun ; Jeong, Soon-Yong ; Park, Young-Kwon ; Jeon, Jong-Ki ;
Clean Technology, volume 16, issue 1, 2010, Pages 12~18
The object of the present study is to apply KF/MgO catalysts to remove sulfur dioxide from dibenzothiophene sulfone, a by-product of oxidative desulfurization. Potassium fluoride was deposited via an impregnation method on MgO. The effects KF loading and calcination on the characteristics of the KF/MgO catalysts were investigated through the BET surface area, XRF, XRD, and temperature-programmed desorption of
. The catalytic performances of the samples were investigated during the decomposition of dibenzothiophene sulfone to biphenyl and sulfur dioxide gas. KF loaded on MgO prepared by the impregnation method showed high catalytic activities for the decomposition of dibenzothiophene sulfone. The higher activity of KF/MgO just dried at 373 K, avoiding the usual activation at high temperature, than that over the calcined catalyst is ascribed to increase of the amount of basic sites. The high basicity probably may be due to the coordinately unsaturated
. The simply dried 10 % KF/MgO catalyst, without the usual activation at high temperature, showed the optimal catalytic properties.
Conversion of Cellulose into Polyols over Noble Metal Catalysts Supported on Activated Carbon
You, Su-Jin ; Kim, Saet-Byul ; Kim, Yong-Tae ; Park, Eun-Duck ;
Clean Technology, volume 16, issue 1, 2010, Pages 19~25
In this work, the conversion of crystalline cellulose into polyols in the presence of hydrogen was examined over noble metal (Pt, Ru, Ir, Rh, and Pd) catalysts supported on activated carbon. For comparison, Pt/
and Pt/H-mordenite were also investigated. Several techniques:
physisorption, X-ray diffraction(XRD), inductively-coupled plasma-atomic emission spectroscopy (ICP-AES), temperature-programmed reduction with
-TPR) and CO chemisorption were employed to characterize the catalysts. The cellulose conversion was not strongly dependent on the types of the catalyst used. Pt/AC showed the highest yields to polyols among activated carbon-supported noble metal catalysts, viz. Pt/AC, Ru/AC, Ir/AC, Rh/AC and Pd/AC.
Liquefaction Characteristics of Polypropylene-Polystyrene Mixture by Pyrolysis at Low Temperature
Cho, Sung-Hyun ; Kim, Chi-Hoi ; Kim, Su-Ho ; Lee, Bong-Hee ;
Clean Technology, volume 16, issue 1, 2010, Pages 26~32
The low temperature pyrolysis of polypropylene (PP), polystyrene (PS) and polypropylene-polystyrene (PP-PS) mixture in a batch reactor at the atmospheric pressure and
was conducted to investigate the synergy effect of PP-PS mixture on the yield of pyrolytic oil. The pyrolysis time was varied from 20 to 80 mins. The products formed during pyrolysis were classified into gas, gasoline, kerosene, gas oil and heavy oil according to the petroleum product quality standard of Ministry of Knowledge Economy. The analysis of the product oils by GC/MS(Gas chromatography/Mass spectrometry) showed that new components were not detected by mixing of PP and PS. There was no synergy effect according to the mixing of PP and PS. Conversions and yields of PP-PS mixtures were linearly dependent on the mixing ratio of samples except for heavy oil yields. Heavy oil yields showed almost constant regardless of the mixing ratio.
Investigation on Desorption Reaction and Heating Value of Used Activated Carbons Collected from VOC Adsorption Towers
Yoon, Sung-Min ; Kim, Joo-Yeon ; Park, Kun-Yik ; Yoon, Soo-Kyung ; Kil, In-Sub ; Park, Hui-Jae ; Rhee, Young-Woo ;
Clean Technology, volume 16, issue 1, 2010, Pages 33~38
The characteristics of desorption reaction and the heating values of used activated carbons collected from the companies of Shiwha/Banwal industrial complex were investigated. The desorption characteristics of used activated carbons were analyzed based on the data obtained from a thermogravimetric analyzer. The activation energies and reaction orders for desorption reaction of used activated carbons were calculated by employing Freeman-Carroll method. Heating values of volatile organic compounds(VOC) desorbed from used activated carbons were estimated based on the data obtained from a total hydrocarbon analyzer. It was found that the reaction orders of desorption of used activated carbons were 0.1~0.8, their desorption activation energies, 6.9~26.4 kJ/mol, and VOC heating values, 0.4~10.7 kcal/kg.
Initial Operating Condition of Membrane Bioreactor with PVDF Hollow Fiber and Permeate Reuse
Shin, Choon-Hwan ; Kang, Dong-Hyo ; Park, Hae-Sik ; Cho, Hyun-Kil ;
Clean Technology, volume 16, issue 1, 2010, Pages 39~45
In this paper, 4 bundle modules of PVDF hollow fiber membrane from Woori Tech company (Korea) were manufactured in a treatment capacity of 10 ton/day. A membrane bioreactor (MBR) pilot plant was installed at Sooyoung Wastewater Treatment Plant in Busan. An alternating aeration process was selected to avoid the concentration profile of suspended solid (SS) in the MBR. For stable operation, raw wastewater with mixed liquor suspended solid (MLSS) of about 1,000 ppm, which was in-flowed from the aeration tank of the wastewater treatment plant, was fed and filtered through the pilot plant. Subsequently the pilot plant were washed three times with washing water: once with ethanol solution, once with a solution of 5% NaOCl, and finally with washing water. After the chemical washing, the remaining water in the MBR was fed into the pilot plant. As a result, the SS removal efficiency was found to be more than 99.9%. The amount of filtrate with the aeration tank influent decreased by 16%, compared with that from the initial conditions, giving rise to 30% increase in the suction pressure. These results were used to set up continuous operation conditions. The results from the continuous operation with influent MLSS of 1,900 mg/L showed that the SS removal efficiency was about 99.99% and that the amount of filtrate and the suction pressure were
and 16~20 cmHg, respectively, indicating stable operation of the pilot plant. However, for the reuse of wastewater, methods need to be sought to avoid growth of algae which affects the SS removal efficiency at inlet and outlet of the permeate tank.
Toulene Removal over the Water-suspended Sn-Incorporated
Photocatalyst Prepared by Solvothermal Method
Kim, Ji-Yeon ; Kim, Ji-Eun ; Kang, Mi-Sook ;
Clean Technology, volume 16, issue 1, 2010, Pages 46~50
This study focuses on the removal of water-suspended toluene of a representative sick house compounds in a liquid photo-system using nanometer-sized Sn-incorporated
which was synthesized by a solvothermal method. The characteristics of the synthesized Sn-
were analyzed by X-ray Diffraction (XRD), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), and UV-visible spectroscopy (UV-Vis). To estimate the photocatalytic activity of Sn-
, the photodegradation of water-suspended toluene was performed, and the remaining concentration was determined using UV-visible spectroscopy. The water-suspended toluene photodegradation over Sn-incorporated
catalyst was better than that over pure
(anatase). The water-suspended toluene of 500 ppm was perfectly decomposed within 300 minutes over 0.01 mol% Sn-
Production of Methane from Anaerobic Fermentation of Marine Macro-algae
Kim, Jeong-Min ; Lee, Yeung-Ho ; Jung, Sung-Hoon ; Lee, Jin-Tae ; Cho, Moo-Hwan ;
Clean Technology, volume 16, issue 1, 2010, Pages 51~58
Methane was produced from the anaerobic digestion of marine macro-algae. Elemental analysis was first performed to estimate the theoretical methane production of three macro-algae (Undaria pinnatifida, Laminaria japonica, Hizikia fusiformis). Three algae were found to contain C 34 ~ 36%, H 5%, O 37 ~ 43%, N 2 ~ 4%, S 0.4 ~ 0.7%, and ash 14~21%, and the theoretical methane content was in the range of 56 ~ 60%, which can produce 442 ~ 568 mL
per g of volatile solid (VS). Using the biological methane potential (BMP) test, we found that L. japonica resulted in the highest yield of methane (52%). Moreover, various operational conditions, such as algae amount, pH, salinity, particle size, and pre-treatment, were investigated in order to find an optimal condition of anaerobic digestion. At pH 8.0, the autoclaved L. japonica (5g VS/200 mL), when used without washing salt, produced 268.5 mL/g VS which is 65% of the theoretical methane productions. Furthermore, using a CSTR (with the working volume of 7 L out of the total volume of 10 L), we have successfully operated the reactor for 65 days and obtained maximum methane production rate of 1.4 L/day with purity of 70%.
Concentration of 2-Ethyl Hexanol Using an Energy-Efficient Distillation Column
Kim, Dae-Hwan ; Park, Jung-Woo ; Kim, Young-Han ;
Clean Technology, volume 16, issue 1, 2010, Pages 59~63
The concentration process of 2-ethyl hexanol used for the intermediate material in the production of plasticizer is examined for the energy conservation of energy-efficient distillation system instead of the conventional two column system through numerical simulation. Some 41 % of energy conservation is expected from the proposed system, and its conservation principle is explained with column profiles. In addition, not only the operating cost but also investment cost can be reduced for the additional benefit of the column application when the thermally coupled distillation is implemented.
Application of a Divided-Wall Column for the Trichlorosilane Refining Process
Hong, Seung-Taek ; Lee, Moon-Yong ;
Clean Technology, volume 16, issue 1, 2010, Pages 64~70
In this study, we suggest the application of the divided-wall column (DWC) to the existing trichlorosilane(TCS) purification process in the commercial polysilicon manufacturing process. Using Aspen HYSYS V7.1, an extensive simulation study was carried out for the analysis of the energy consumptions and capital cost for the conventional sequential distillation configuration and the DWC for producing a given purity and yield of trichlorosilane. As a result, it is shown that the DWC saves the separation energy by 61% and the equipment cost by 58% compared with the conventional distillation process.