Kumho Petrochemical Rand Center

Daejeon, South Korea

Kumho Petrochemical Rand Center

Daejeon, South Korea
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Cho J.,Kongju National University | Kim Y.M.,Kumho Petrochemical Rand Center | Noh J.,Hoseo University | Kim D.S.,Kongju National University
Asian Journal of Chemistry | Year: 2014

The mixture of methanol and dimethyl carbonate is characterized by an azeotropic point, thus, it is impossible to separate the azeotrope into respective high-purity products by general distillation. Herein, the separation of a methanol-dimethyl carbonate mixture via pressure-swing distillation was evaluated based on modeling and optimization of the separation process to obtain high-purity dimethyl carbonate. Currently, no experimental data on vapor-liquid equilibrium of methanol-dimethyI carbonate system is available in existing references. And even PRO/ II, Aspen Plus, and ChemCAD simulation programs do not include a built-in binary Interaction parameter of thermo dynamic model of methanol-dimethyl carbonate system for accurate calculation. Therefore, the vapor-liquid equilibrium of the methanol-dimethyl carbonate binary system was experimentally evaluated under low-pressure and atmospheric pressure conditions and the binary interaction parameters were deduced from the non-random two-liquid model regression using the experimental data. The obtained binary intraction parameters were applied in modeling.of the pressure-swing distillation process. Reboiler heat duty values from simulations under high-low pressure and low-high pressure configuration processes were compared and the process was optimized to minimize the heat duty. Dimethyl Carbonate Vapor-liquid equilibrium Pressure-swing distillation.

Yun Y.H.,Kumho Petrochemical Rand Center | Lee S.C.,Sungkyunkwan University | Jang J.T.,Sungkyunkwan University | Yoon K.J.,Sungkyunkwan University | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2014

Thermo-catalytic decomposition of propane to solid carbon and hydrogen was examined for hydrogen production without CO2 emission. The reaction was carried out over a carbon black catalyst in a bench-scale fluidized bed reactor. Effects of reaction temperature on the propane conversion and product distribution were examined. Catalytic activity of the carbon black was maintained stable for longer than 8 h in spite of carbon deposition. From 600 to 650 °C, the propane conversion increased sharply with propylene produced in a considerably larger amount than methane. As the reaction temperature further increased up to 800 °C, the major hydrocarbon product was methane; the production of propylene decreased rapidly and ethylene was the next most abundant product. The surface area of the carbon black was decreased as the reaction proceeded due to carbon deposition. Surface morphology of the used carbon black was observed by TEM and the change of the aggregates size was measured. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Park J.-H.,Chungbuk National University | Row K.,Kumho Petrochemical Rand Center | Shin C.-H.,Chungbuk National University
Catalysis Communications | Year: 2013

BiFe0.65NixMo oxide catalysts (x = 0-0.2) were prepared and applied for the oxidative dehydrogenation of butenes to 1,3-butadiene. Temperature programmed reoxidation (TPRO) measurements revealed that the catalytic activity was closely related to the oxygen mobility. The surface modification by small amounts of nickel addition is favorable in this reaction. Among the catalysts studied here, BiFe0.65Ni 0.05Mo oxide catalyst showed the highest conversion and BD yield (X = 86% and YBD = 72%) due to the high oxygen mobility. The BiFe 0.65Ni0.05Mo oxide catalyst is very stable and no deactivation during the 100 h reaction was shown. © 2012 Elsevier B.V.

Park J.-H.,Chungbuk National University | Noh H.,Kumho Petrochemical Rand Center | Park J.W.,Kumho Petrochemical Rand Center | Row K.,Kumho Petrochemical Rand Center | And 2 more authors.
Applied Catalysis A: General | Year: 2012

BiMoFe x oxide catalysts (x = 0-1.00) were prepared by co-precipitation and their catalytic activities in the oxidative dehydrogenation of n-butenes were tested. X-ray diffraction (XRD) and Raman spectroscopy showed that the main solid phases were composed of Bi 3Mo 2FeO 12 as oxygen acceptor and Fe 2(MoO 4) 3 as oxygen donor and the mixing of these phases enhanced catalytic activity. XRD patterns showed that Fe 2(MoO 4) 3 was reduced to FeMoO 4 during the reaction. The peak temperature of programmed reduction of 1-butene and successive oxidation (TPRO) was dependent on Fe contents in BiMoFe x oxide catalysts and was minimized at x = 0.65, which showed the greatest oxygen mobility. The peak position in the low temperature region of TPRO profiles could be correlated with butene conversion and BD yield. © 2012 Elsevier B.V. All rights reserved.

Zhang C.,Iowa State University | Xia Y.,Iowa State University | Chen R.,Iowa State University | Huh S.,Kumho Petrochemical Rand Center | And 3 more authors.
Green Chemistry | Year: 2013

Bio-based polyols from epoxidized soybean oil and castor oil fatty acid were developed using an environmentally friendly, solvent-free/catalyst-free method. The effects of the molar ratios of the carboxyl to the epoxy groups, reaction time, and reaction temperature on the polyols' structures were systematically studied. Subsequently, polyurethane films were prepared from these green polyols. Properties of the new, soy-castor oil based polyurethane films were compared with two other polyurethane films prepared from castor oil and methoxylated soybean oil polyol, respectively. Thermal and mechanical tests showed that the polyurethane films prepared from the new polyols exhibited higher glass transition temperatures, tensile strength, Young's modulus, and thermal stability because of the higher degree of cross-linking in the new polyols. Moreover, the novel polyols, prepared using the solvent-free and catalyst-free synthetic route, were 100% bio-based and facilitate a more environmentally friendly and economical process than conventional soy-based polyols used for polyurethane production. © 2013 The Royal Society of Chemistry.

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