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( Veriansyah Bambang ),이윤우,박태준 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
In supercritical water, oxidation of wastewater from LCD manufacturing plant was performed in an isothermal, isobaric continuous-flow reactor at the condition of 396-615oC, 250 bar. It is found that chromium content in wastewater could be recovered as chromium oxide (α-HCrO2 and Cr2O3) nanoparticles during oxidation process. All of the organics component in the wastewater could be completely destructed at supercritical temperature and pressure with sufficient amounts of oxygen.
Bambang Veriansyah,Jong-Chol Lee,김재덕 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
The corrosion of reactor is one of the obstacles that inhibiting the development of supercritical water oxidation (SCWO) into a viable industrial process. A concentric vertical double wall reactor has been developed in which SCWO reaction takes place inside an inner tube (titanium grade 2, non-porous) whereas pressure resistance is ensured by a Hastelloy C-276 external vessel, to handle high-risk wastes resulting from munitions demilitarization. Experimental results concerning the oxidation of a mixture of thiodiglycol [TDG, (HOC2H4)2S] and hydrochloric acid [HCl], which is used as a sulfur mustard stimulant, confirmed the ability of the reactor to treat corrosive wastes. High destruction rates based on total organic carbon were achieved (>99%) without production of chars or undesired gases such as carbon monoxide and methane. The carbon-containing product was carbon dioxide. Sulfur and chloride were totally recovered in the aqueous effluent as sulfuric acid and hydrochloric acid. No corrosion was noticed in the reactor. The titanium tube shielded the pressure vessel from corrosion. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Continuous supercritical water gasification of isooctane: A promising reactor design
Susanti, Ratna F.,Veriansyah, Bambang,Kim, Jae-Duck,Kim, Jaehoon,Lee, Youn-Woo Elsevier 2010 International journal of hydrogen energy Vol.35 No.5
<P><B>Abstract</B></P><P>A new design of supercritical water gasification system was developed to achieve high hydrogen gas yield and good gas–liquid flow stability. The apparatus consisted of a reaction zone, an insulation zone and a cooling zone that were directly connected to the reaction zone. The reactor was set up at an inclination of 75° from vertical position, and feed and water were introduced at the bottom of the reactor. The performances of this new system were investigated with gasification of isooctane at various experimental conditions – reaction temperatures of 601–676°C, residence times of 6–33s, isooctane concentrations of 5–33wt%, and oxidant (hydrogen peroxide) concentrations up to 4507mmol/L without using catalysts. A significant increase in hydrogen gas yield, almost four times higher than that from the previous up-down gasifier configuration (B. Veriansyah, J. Kim, J.D. Kim, Y.W. Lee, Hydrogen Production by Gasification of Isooctane using Supercritical Water, Int. J. Green Energy. 5 (2008) 322–333) was observed with the present gasifier configuration. High hydrogen gas yield (6.13mol/mol isooctane) was obtained at high reaction temperature of 637°C, a low feed concentration of 9.9wt% and a long residence time of 18s in the presence of 2701.1mmol/L hydrogen peroxide. At this condition, the produced gases mainly consisted of hydrogen (59.5mol%), methane (14.8mol%) and carbon dioxide (22.0mol%), and a small amount of carbon monoxide (1.6mol%) and C<SUB>2</SUB>–C<SUB>3</SUB> species (2.1mol%). Reaction mechanisms of supercritical water gasification of isooctane were also presented.</P>
A new correlation to predict the stability of liquid jet in dense carbon dioxide
Hyung Chul Hahm,Bambang Veriansyah,Jaehoon Kim,Wan-Joo Kim,Seong-Geun Oh,Youn-Woo Lee,김재덕 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.6
The stability of liquid jet of dichloromethane in dense carbon dioxide was investigated in an aerosol solvent extraction system (ASES). The stability experiments were carried out at pressures ranging 30–150 bar and a temperature of 308 K, with a nozzle size diameter of 0.254 mm. Interfacial tensions of dichloromethane–carbon dioxide system were measured using a capillary rise method to correlate the stability of liquid jets with a dimensionless number. A new dimensionless number, Z*, was proposed to define an atomization flow regime of the liquid jets in dense carbon dioxide.
Extraction of mangiferin from Mahkota Dewa (Phaleria macrocarpa) using subcritical water
Wan-Joo Kim,김재덕,Bambang Veriansyah,Youn-Woo Lee,김재훈 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.3
A pharmacological active component, mangiferin, was extracted from Mahkota Dewa using subcritical water extraction. The subcritical water extractions were carried out at temperatures ranging 323–423 K,pressures ranging 0.7–4.0 MPa, and extraction times ranging 1–7 h. Extraction yield of mangiferin was measured using high-performance liquid chromatography (HPLC). The extraction yield was strongly dependent on the temperature while weakly dependent on the extraction pressure. As the extraction temperature increased, the extraction mangiferin yield increased, possibly resulting from the decrease in polarity of subcritical water at higher temperature. At an optimal extraction condition of 373 K, 4.0 MPa and extraction time of 5 h, the extraction yield of mangiferin was 21.7 mg/g. This value was close to the extraction yield with methanol (25.0 mg/g) and higher than those with water (18.6 mg/g) or ethanol (13.2 mg/g) at their boiling points. 2010 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
Choi, Hye-Min,Veriansyah, Bambang,Kim, Jaehoon,Kim, Jae-Duck,Lee, Youn-Woo Marcel Dekker 2009 Journal of Environmental Science and Health. Part Vol.44 No.5
<P>Catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in the presence of transformer oil was carried out in a batch mode to detoxify PCBs and to recycle the treated oil. Various metal supported catalysts, including 0.98 wt% Pt, 0.79 wt% Pd and 12.8 wt% Ni on gamma -alumina (gamma -Al(2)O(3)) support, and 57.6 wt% Ni on silicon oxide-aluminum oxide (SiO(2)-Al(2)O(3)) support were used for the hydrodechlorination. Metal particle size of the Pt catalyst was 2.0 nm and metal particle sizes of the Pd and Ni catalysts were in the range of 6.4-6.9 nm. Various supercritical fluids, supercritical carbon dioxide (scCO(2)), supercritical propane (scPropane), supercritical dimethyl ether (scDME) and supercritical isobutane (scIsobutane) were used as reaction media. PCBs conversion, dechlorination degree of PCBs, was measured using gas chromatograph (GC) with an electron capture detector (ECD). The hydrodechorination degree increased in the order Ni > Pd > Pt, possibly due to higher metal loading and larger metal size of the Ni catalysts. At temperatures below 175 degrees C, scCO(2) was effective as the reaction media for the catalytic hydrodechlorination of PCBs in the presence of the transformer oil. However, PCBs conversion decreased significantly when the hydrodechlorination was carried out in a homogeneous phase with using scPropane, scDME or scIsobutane as a reaction medium. This was attributed to dilution effect of the supercritical fluids. Molecular weights of the transformer oils before and after the catalytic hydrodechlorination were analyzed using high-performance size exclusion chromatography (HPSEC). The molecular weight of the treated oil with 100 % PCBs conversion did not change after the catalytic hydrodechlorination at 200 degrees C. This process has proven to be effective to detoxify PCBs containing transformer oil and to recycle the treated oil.</P>
Pentachlorophenol oxidation rates in supercritical water
Han, Seung Ho,Veriansyah, Bambang,Kim, Jae-Duck,Lee, Jong-Chol Taylor & Francis Inc. 2007 Journal of Environmental Science and Health. Part Vol.42 No.14
<P> The oxidation rate of pentachlorophenol, [C6HCl5O] which is used to control termites and as a general herbicide and also as the probable human's carcinogen, was investigated in an isothermal continuous tubular reactor under supercritical water oxidation (SCWO) conditions. The experiments were conducted at a temperature of 400-550°C and a fixed pressure of 25 MPa, with a residence time that ranged from 6 s to 26 s. The conversion of PCP was monitored by analyzing total organic carbon (TOC) on the liquid effluent samples. The initial TOC concentrations of PCP were varied from 0.74 mmol/L to 2.91 mmol/L and the oxygen concentrations were varied from 0.46 mmol/L to 3.52 mmol/L. By taking into account the dependence of the oxidant and TOC concentration on the reaction rate, a global PCP oxidation rate was regressed from the data of 48 experiments, to a 95% confidence level. The resulting activation energy was determined to be 43.56 ± 1.47 kJ/mol, and the pre-exponential factor was (1.92 ± 0.46) × 102 L1.16 mmol-0.16 s-1. The reaction orders for the PCP (based on TOC) and the oxidant were 0.74 ± 0.02 and 0.42 ± 0.05, respectively.</P>