http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
( 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.
Formation of titanium hydroxide nanoparticles in supercritical carbon dioxide
Wan-Joo Kim,Bambang Veriansyah,오성근,Jae-Duck Kim 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.1
Titanium isopropoxide [TIP, C12H28O₄Ti] hydrolysis in supercritical carbon dioxide (SCCO₂) was performed using an aerosol solvent extraction system (ASES). The experiments were conducted at a pressure of 80-150 bar and a fixed temperature of 35oC, with a nozzle size diameter that ranged from 0.007 inch (0.18 mm) to 0.04 inch (1.02 mm). The TIP concentration in the liquid solution was varied from 0.1 to 2 wt.%. In situ formation of titanium hydroxide (Ti(OH)₄) nanoparticles was found during the ASES process. The effect of pressure, TIP concentration in the liquid solution, and nozzle size diameter on Ti(OH)₄ particle size was investigated. Based on scanning electron microscope and electrophoretic light scattering analyses for particle size, non-faceted titanium hydroxide particles were obtained in the range 132-356 nm.
Edward Widjojokusumo,이윤우,Bambang Veriansyah,Yong-Suk Youn,Raymond Rubianto Tjandrawinata 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
The co-precipitation of loperamide hydrochloride (LPM) and polyethylene glycol (PEG) using aerosol solvent extraction system (ASES) was examined. Scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS) analysis showed that the co-precipitation was achieved in various LPM-PEG mass ratios with changes in its morphology. In 10-50% PEG mass ratios, angular-shaped particles were formed, whereas in 65-90% PEG mass ratios, irregular-shaped particles were formed. X-ray diffraction (XRD) analysis of the co-precipitates revealed that the LPM retained amorphous structure, while, on the other hand, the PEG retained crystalline structure. Fourier transform infrared (FT-IR) spectra indicated carbonyl function group of LPM and ether function group of PEG appeared in the co-precipitates. Results of a dissolution test showed that the co-precipitates of LPM-PEG had higher dissolution rate compared to that of the raw material and processed LPM with ASES. Taken together, the co-precipitation of LPMPEG was achieved using ASES and higher in its dissolution rate. EDS of 50% PEG precipitate showed that chlorine map (indicate LPM) and oxygen map (indicate PEG) are co-precipitated
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.