Gyeonggi do, South Korea
Gyeonggi do, South Korea

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Lee S.-H.,Sunchon National University | Kim Y.-S.,ETIS Co. | Chu C.-H.,ETIS Co. | Na I.-C.,CNL Energy Co. | And 2 more authors.
Korean Chemical Engineering Research | Year: 2017

Recovery of sulfuric acid is very important after biomass converted to sugar by acid hydrolysis. In this work, the separation of sulfuric acid from sulfuric acid/glucose solution was studied by electrodiaysis. Three chamber method, which requires both anion membrane and cation membrane, is the most commonly used in the electrodialysis process, but two chamber method using only an anion membrane was the focus of this study. Sulfuric acid was perfectly separated from a mixture of 10-30 wt% glucose and 1-3 M sulfuric acid by electrodialysis using two chamber method. The separation rate of sulfuric acid lineary increased with higher current density when the affect of diffusion and convection of the membrane was small. Without electric energy, 45% of sulfuric acid was separated by diffusion and convection only. © 2017, Korean Institute of Chemical Engineers. All rights reserved.


Kim Y.-S.,ETIS Co | Chu C.-H.,ETIS Co | Jeong J.-J.,Sunchon National University | Ahn M.-W.,Sunchon National University | And 3 more authors.
Korean Chemical Engineering Research | Year: 2014

Microbial fuel cells (MFC) were operated with livestock wastes and PEMFC (Proton Exchange Membrane Fuel Cells) MEA (Membrane and Electrode Assembly). OCV of MFC with mixtures of microbial was higher than that of MFC with single microbial. MFC using pig wastes showed highest OCV (540 mV) among cow waste, chicken waste and duck waste. And the power density of MFC using pig waste was 963 mW/m2. Contamination of MEA with Na2+, Ca 2+, K+ ion and impurities was the one cause for low performance of MFC during operation.


Jeong J.-H.,Sunchon National University | Shin E.-K.,Sunchon National University | Jeong J.-J.,Sunchon National University | Na I.-C.,DONG Energy | And 2 more authors.
Korean Chemical Engineering Research | Year: 2014

Proton Exchange Membrane Fuel Cells (PEMFC) can generate hydrogen and oxygen from water by electrolysis. But the electrode and polymer electrolyte membrane degrade rapidly during PEM water electrolysis because of high operation voltage over 1.7V. In order to reduce the rate of anode electrode degradation, unsupported IrO2 catalyst was used generally. In this study, Pt/C catalyst for PEMFC was used as a water electrolysis catalyst, and then the degradation of catalyst and membrane were analysed. After water electrolysis reaction in the voltage range from 1.8V to 2.0V, I-V curves, impedance spectra, cyclic voltammograms and linear sweep voltammetry (LSV) were measured at PEMFC operation condition. The degradation rate of electrode and membrane increased as the voltage of water electrolysis increased. The hydrogen yield was 88 % during water electrolysis for 1 min at 2.0V, the performance at 0.6V decreased to 49% due to degradation of membrane and electrode assembly.


Lee S.-H.,Sunchon National University | Mun J.-Y.,Sunchon National University | Kim Y.-S.,ETIS Co | Chu C.-H.,ETIS Co | And 5 more authors.
Korean Chemical Engineering Research | Year: 2016

Microbial fuel cells (MFC) were operated with pig wastes and PEMFC (Proton Exchange Membrane Fuel Cells) MEA (Membrane and Electrode Assembly). Performance of hydrocarbon membrane was compared with that of perfluoro membrane at MFC condition. Sulfonated-Poly(Arylene Ether Sulfone) was used as hydrocarbon membrane and Gore membrane was used as perfluoro membrane. OCV of sPAES MEA was 50mV higher than that of Gore MEA and power density of sPAES MEA was similar that of Gore MEA. Reinforcement of sPAES membrane stabilized the performance of MEA in MFC. The highest performance was obtained at temperature of 45 °C and with culture solution circulation rate of 50 ml/min. The highest power density was 1,100 mW/m2 at optimum condition in MFC using pig waste.


Kim Y.-S.,ETIS Co. | Lee S.-H.,Sunchon National University | Chu C.-H.,ETIS Co. | Na I.-C.,DONG Energy | And 2 more authors.
Korean Chemical Engineering Research | Year: 2015

Enzyme fuel cells were composed of enzyme anode and PEMFC cathode. Enzyme anodes was fabricated by compression of a mixture of graphite particle, glucose oxidase as a enzyme and ferrocene as a mediator, and then coated with Nafion ionomer. Open circuit voltage (OCV) were measured with variation of anode manufacture factors, to find optimum condition of enzyme anode. Optimum pressure was 9.0 MPar for enzyme anode pressing process. Highest OCV was obtained at 60% graphite composition in enzyme anode. Optimum glucose concentration was 1.7mol/l in anode substrate solution and enzyme activity of anode was stable for 7 days.


Lee S.-H.,Sunchon National University | Kim Y.-S.,ETIS Co | Chu C.-H.,ETIS Co | Na I.-C.,DONG Energy | And 2 more authors.
Korean Chemical Engineering Research | Year: 2016

Enzyme fuel cells were composed of enzyme cathode and PEMFC anode. Enzyme cathode was fabricated by compression of a mixture of graphite particle, laccase as a enzyme and ABTS as a redox mediator, and then coated with Nafion ionomer. Open circuit voltage (OCV) were measured with variation of cathode manufacture factors, to find optimum condition of enzyme cathode. Optimum pressure was 4.0 bar for enzyme cathode pressing process. Highest OCV was obtained at 95% graphite composition in enzyme cathodee. Optimum glucose concentration was 0.4 mol/l in cathode substrate solution.


Lee S.-H.,Sunchon National University | Hwang B.-C.,Sunchon National University | Lee H.-R.,Sunchon National University | Kim Y.-S.,Sunchon National University | And 5 more authors.
Korean Chemical Engineering Research | Year: 2015

Enzyme fuel cells were operated with cells composed of enzyme anode and PEMFC cathode. Enzyme anodes was fabricated by compression of a mixture of graphite particle, glucose oxidase(Gox) as a enzyme and ferrocene as a redox mediator, and then coated with Nafion ionomer solution. Performances of enzyme unit cell were measured with variation of anode manufacture factors, to find optimum condition of enzyme anode. Optimum pressure was 8.89MPa for enzyme anode pressing process. Highest power density was obtained at 60% graphite composition in enzyme anode. Optimum glucose concentration was 1.7 mol/l in anode substrate solution. The enzyme anode was stabilized by two times of deeping in Nafion solution for 1 sec.


Jung H.-S.,Sunchon National University | Oh S.-J.,Sunchon National University | Jeong J.-J.,Sunchon National University | Na I.-C.,Sunchon National University | And 4 more authors.
Korean Chemical Engineering Research | Year: 2015

Aluminum alloy was examined as a material of low weight reactor for hydrolysis of NaBH4. Aluminum is dissolved with alkali, but there is NaOH as a stabilizer in NaBH4 solution. To decrease corrosion rate of aluminum, decrease NaOH concentration and this result in loss of NaBH4 during storage of NaBH4 solution. Therefore stability of NaBH4 and corrosion of aluminum should be considered in determining the optimum NaOH concentration. NaBH4 stability and corrosion rate of aluminum were measured by hydrogen evolution rate. NaBH4 stability was tested at 20~50 °C and aluminum corrosion was measured at 60~90 °C. The optimum concentration of NaOH was 0.3 wt%, considering both NaBH4 stability and aluminun corrosion. NaBH4 hydrolysis reaction continued 200min in aluminum No 6061 alloy reactor with 0.3 wt% NaOH at 80~90 °C.


Jung H.-S.,Sunchon National University | Jo B.-J.,Sunchon National University | Lee J.-H.,CNL Energy Co | Lee H.-J.,CNL Energy Co | And 3 more authors.
Korean Chemical Engineering Research | Year: 2016

Proton Exchange Membrane Fuel Cells (PEMFC) instead of batteries is appropriate for long time flight of unmanned aero vehicles (UAV). In this work, NaBH4 hydrolysis system supplying hydrogen to PEMFC was studied. In order to decrease weight of NaBH4 hydrolysis system, enhancement of hydrogen yield, recovery of condensing water and maintenance of stable hydrogen yield were studied. The hydrogen yield of 3.4% was increased by controlling of hydrogen pressure in hydrolysis reactor. Condensing water formed during air cooling of hydrogen was recovered into storage tank of NaBH4 solution. In this process the condensing water dissolved NaBH4 powder and then addition of NaBH4 solution decreased system weight of 14%. NaBH4 hydrolysis system was stably operated with hydrogen yield of 96% by 2.0g Co-P-B catalyst for 10 hours at 2.0L/min hydrogen evolution rate.


The device for automatically supplying a toner to a toner cartridge of the present invention comprises: a toner storage container for storing toners to be refilled; an outer container for containing the toner storage container; a toner supplying means for supplying the toner stored in the toner storage container to the toner cartridge; and a toner supply hose for sending the toner to the toner cartridge, wherein the toner supplying means consists of: a balloon, which expands and contracts when air is supplied to or discharged from the inside, so that the toner at the bottom is pushed in towards the cartridge or the toner at the top moves to supplement the bottom; an air pump for supplying air to the balloon; an air pipe for connecting the balloon and the air pump; a control valve; and a controller for operating the control valve, enabling the present invention to print stably by preventing toner shortage.

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