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이윤주,안병성,( Haznan Abimanyu1 ),최영재,정성택 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Recently, Dimethyl carbonate (DMC) has been attracting an attention as an environmentally benign chemical. DMC is a useful substitute for phosgene, methyl chloride, dimethyl sulfate as methylation and carbonylation agent in very versatile reactions. In this paper, the continuous synthesis of DMC by homogeneous reactive distillation in a pilot scale is reported. The steady-state process simulation has been performed to obtain the exact solution for the overall modeling, using the general purpose - advanced process simulator, gPROMS(version 2.3). For comparison, ASPEN Plus(version 12.1) has also been used with the same conditions.
Nagaraja, Bhari Mallanna,Abimanyu, Haznan,Jung, Kwang-Deog,Yoo, Kye-Sang Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Spray pyrolysis has been found as an excellent method for the preparation of mesoporous barium sulfate at higher temperature. Ethylene glycol, a reducing agent, and solvents had good inhibition effect for the preparation of $BaSO_4$ nano particles. The $BaSO_4$ solution was sprayed at 500 & 800 ${^{\circ}C}$ using different solvents such as methanol, ethanol, propanol and n-butyl alcohol. $N_2$ adsorption-desorption isotherm revealed that $BaSO_4$ is micropore free, possessing narrow mesopores size distribution and high BET surface areas of 72.52 $m^2\;g^{-1}$ at 800 ${^{\circ}C}$ using propanol as an additive. Scanning electron microscopy (SEM) indicates that the morphology of $BaSO_4$ nano material shows uniform shell like particles. Transmission electron microscopy (TEM) proved that the resulting BaSO4 nano particles were uniform in size and the average particle size was 4-8 nm. The surface functionality and ethylene glycol peaks were assessed by Fourier transform infrared resonance (FTIR) spectroscopy. Low intensity ethylene glycol specific absorption peak was observed in propanol which proved that propanol had good inhibition effect on the structural morphology of nano particles.
Bhari Mallanna Nagaraja,유계상,정광덕,Haznan Abimanyu 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Spray pyrolysis has been found as an excellent method for the preparation of mesoporous barium sulfate at higher temperature. Ethylene glycol, a reducing agent, and solvents had good inhibition effect for the preparation of BaSO₄nano particles. The BaSO₄solution was sprayed at 500 & 800℃ using different solvents such as methanol, ethanol, propanol and n-butyl alcohol. N₂adsorption-desorption isotherm revealed that BaSO₄is micropore free, possessing narrow mesopores size distribution and high BET surface areas of 72.52 m² g-¹ at 800℃ using propanol as an additive. Scanning electron microscopy (SEM) indicates that the morphology of BaSO₄nano material shows uniform shell like particles. Transmission electron microscopy (TEM) proved that the resulting BaSO₄nano particles were uniform in size and the average particle size was 4-8 nm. The surface functionality and ethylene glycol peaks were assessed by Fourier transform infrared resonance (FTIR) spectroscopy. Low intensity ethylene glycol specific absorption peak was observed in propanol which proved that propanol had good inhibition effect on the structural morphology of nano particles.