• 한국대기환경학회지
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• 제24권4호
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• pp.455-469
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• 2008

VOCs (Volatile organic compounds) are known as one of the harmful chemicals, causing cancer and global warming. Therefore, the proper control, removal, and reduction of the emission of VOCs are important tasks for the environmental protection. Among the method of VOCs removal activated carbon bed is the most efficient and economical method. In this study, the adsorption performance of toluene gas was investigated using various activated carbons. To find out the adsorption efficiency, the H/D (Height/Diameter) of the activated carbon and GHSV (Gas Hourly Space Velocity) of the toluene gas were manipulated with various conditions. The effect of the temperature, humidity and toluene-MEK-IPA mixed gas on adsorption were also investigated. As a result, a high adsorption performance was found when GHSV is lower at room temperature and low humidity. It was also found that the adsorption efficiency of toluene-MEK-IPA mixed gas system was lower than that of toluene gas system.

• 한국환경보건학회지
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• 제34권3호
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• pp.240-246
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• 2008

The purpose of this study was to gain basic information on the characteristics of $CO_2$ adsorption in relation to $Na_2CO_3$, $K_2CO_3$, $Li_2CO_3$-impregnated activated carbon in a Fixed Bed Reactor. From the results of this study the following conclusions were made: $Na_2CO_3$, $K_2CO_3$, $Li_2CO_3$-impregnated activated carbon had a longer breakthrough time and more enhanced adsorption capacity than activated carbon alone. When tested with isothermal adsorption and tested for $CO_2$ adsorption the amount of $CO_2$ adsorbed varied with temperature, $CO_2$ inlet concentration, gas flow rate, aspect ratio, etc. Based on the results, when Langmuir, Freundlich and Dubinin-Polanyi adsorption isotherms were used for linear regression of isothermal adsorption data, Langmuir adsorption isotherm was the most suitable. And, the optimum condition for $Na_2CO_3$ and $K_2CO_3$ impregnated activated carbon make-up was 1N and $Li_2CO_3$ was 0.1N. It could be concluded that adsorption capacity was decreased with adsorption temperature and increased gas concentration. When the aspect ratio (L/D) was varied 0.5, 1.0 and 2.0, the significant drop of adsorption amount was observed below 1.0 and breakthrough time was shortened with gas flow rate.

• 공업화학
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• 제17권5호
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• pp.465-470
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• 2006

실록산은 많은 소비 및 공업제품에 사용되고 있고 이들이 매립되어 발생되는 매립가스에는 휘발성 실록산을 포함한다. 휘발성 실록산을 포함한 매립가스를 가스엔진의 연료로 사용할 경우 매립가스내 휘발성 실록산은 가스엔진뿐만 아니라 전처리 시설에 큰 해를 입히게 된다. 따라서 본 연구에서는 매립가스내 휘발성 실록산 흡착제로서 활성탄 대용으로 천연 점토광물인 질석과 일라이트를 사용해 이의 유용성을 검토하였다. 질석, 일라이트 및 활성탄의 SEM 및 BET 분석을 통해 이들의 물성값을 비교하였다. 또한 일라이트 및 질석을 흡착제로 사용하여 D5 실록산의 흡착용량을 평가 하였는바, 각각 1.7 g/g 일라이트 및 3.8 g/g 질석의 대단히 높은 흡착용량을 나타내었다.

• Journal of the Korean Wood Science and Technology
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• 제31권6호
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• pp.83-88
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• 2003

The woodceramics are porous amorphous carbon and glassy carbon composite materials. Woodceramics attracted a lot of attention in recent years because they are environmentally friendly and because of their unique functional characteristics such as catalysis, moisture absorption, deodorization, purification, carrier for microbial activity, specific stiffness, corrosion and friction resistance, and their electromagnetic shielding capacity. In this paper, we made new products of clay-woodceramics to investigate the industrial analysis and ethylene gas adsorption for basic data of building- and packging- materials keeping fruit fresh for a long time. Clay-woodceramics were carbonized for 3 h of heating in a special furnace under a gas flow of nitrogen(15 ml/min.) from 3 layers-clay-woodparticleboard made from pallet waste wood, phenol- formaldehyde resin(hereafter PF, Non volatile content:52%, resin content 30%), and clay(10%, 20% and 30%). Carbonization temperature was 400℃, 600℃ and 800℃. Experimental results shows that the higher the carbonization temperature, the higher the fixed carbon and the lower the volatile contents. The higher the clay content, the more the ash content. The higher the carbonization temperature, the more the ethylene gas adsorption. Carbonization temperature of 800℃ gave the best reslts as same as that of white charcoal and activated carbon.(800℃-clay-woodceramic: 5.36 ppm, white charcoal: 5.66 ppm, activated carbon: 5.79 ppm) The clay contents did not make difference of ethylene gas adsoption.

• 폴리머
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• 제31권6호
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• pp.479-484
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• 2007

본 연구는 점착제 분사방식으로 고성능 hybrid ion exchange fiber(HIEF)를 제조하고 이들의 암모니아 흡착성능 및 기본물성을 측정하였다. HIEF의 이온교환용량은 수지 부착량이 증가함에 따라 증가하였으며 단일 수지와 이온교환섬유의 이온교환용량보다 크게 나타났다. 또한 암모니아의 제거율은 HIEF의 충전밀도가 증가할수록 증가하였으며 흡착 파과시간은 270분으로 섬유나 수지에 비해 길게 나타났고 최대 암모니아 흡착량은 94%이었다. 또한 암모니아 흡착 파과시간은 유량 및 농도가 증가함에 따라 빠르게 진행되었다. 암모니아 반응속도 상수(k)는 유입되는 가스농도의 증가에 따라 증가하였으며, 질량이 증가할수록 감소하였으며 가스 유속이 증가할수록 반응속도 상수(k)가 증가하였다.

• Carbon letters
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• 제12권1호
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• pp.21-25
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• 2011

A novel electrode for an NO gas sensor was fabricated from electrospun polyacrylonitrile fibers by thermal treatment to obtain carbon fibers followed by chemical activation to enhance the activity of gas adsorption sites. The activation process improved the porous structure, increasing the specific surface area and allowing for efficient gas adsorption. The gas sensing ability and response time were improved by the increased surface area and micropore fraction. High performance gas sensing was then demonstrated by following a proposed mechanism based on the activation effects. Initially, the pore structure developed by activation significantly increased the amount of adsorbed gas, as shown by the high sensitivity of the gas sensor. Additionally, the increased micropore fraction enabled a rapid sensor response time due to improve the adsorption speed. Overall, the sensitivity for NO gas was improved approximately six-fold, and the response time was reduced by approximately 83% due to the effects of chemical activation.

• 공업화학
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• 제26권5호
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• pp.587-592
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• 2015

휘발성 유기화합물(Volatile organic compounds, VOCs) 중 톨루엔 가스의 흡착특성을 향상시키기 위하여 불소화 반응을 이용하여 활성탄소를 처리하였다. 이 활성탄소의 기공특성과 표면특성 평가를 위하여 비표면적 측정기와 X선광전자분광법(XPS)을 사용하여 분석하였고, 가스크로마토그래피를 이용하여 톨루엔 가스 흡착능과 제거효율을 고찰하였다. 100 ppm의 톨루엔 가스가 $300cm^3/min$으로 주입될 때, 불소화 처리된 활성탄소의 파과시간이 미처리 활성탄소에 비하여 약 27% 증가하였다. 0.1 g의 불소처리 활성탄소 흡착재는 19 h의 흡착시간 동안 100 ppm 농도의 톨루엔 가스를 모두 제거하였다. 이러한 실험 결과들은 톨루엔과 같은 발암성 물질을 제거하는 처리 기술로 활용될 수 있음을 보여주었다.

• 대한기계학회논문집B
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• 제31권5호
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• pp.416-424
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• 2007

In adsorption/catalytic process, numerical analysis has been performed to identify the flow characteristics of flue gas in the cyclone and to estimate the residence time of activated carbon using Computational Fluid Dynamics (CFD) technique. To consider flue gas and activated carbon particles simultaneously, Euler-Lagrangian model was employed so that residence time could be obtained from the numerical analysis directly. The numerical analysis has been performed with different three particle sizes and compared each flow characteristics with particle’ size. Fundamental flow patterns of flue gas and activated carbon particles, pressure distribution, residence time of flue gas, and activated carbon particles and distribution of activated carbon have been obtained from the numerical analysis.

• 한국대기환경학회지
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• 제14권2호
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• pp.133-142
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• 1998

Gas adsorption on adsorbents depends on temperatures and pressures. When these parameters are fixed, the adsorption capability and selectivity can not be changed. If the gas adsorption is controlled by another factor like electromagnetic field, the adsorption and desorption can be managed by much intentional way. The microwave has characteristics to excite particular components such as water without destroying it. In this study, microwave was irradiated to the adsorbent of an NaY zeolite which is almost transparent to microwave. As vapor of 1, 1, 2- trichloro-1, 2, 2-trifluoroethane (CFC-113) and water flowed simultaneously on the zeolite packed in a column at room temperature, only water was adsorbed. The . adsorbed water was removed from the zeolite and then replaced by CFC-113, since the microwave was irradiated. Greater the power of microwave was, more CFC-113 was adsorbed. The water adsorption took place again after a latent period by stopping the microwave irradiation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.309-309
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• 2000

The main objective of this study is to understand the regeneration step of the PTSA(Pressure and thermal swing adsorption) process below the atmospheric pressure by rigorous dynamic simulation. This target process is to recover toluene using activated carbon as an adsorbent. To do this, the dynamic simulations for the regeneration step are performed at 360, 490, 590mmHg and at high temperature after the simulation of the adsorption step at latm and 298K. A mathematical model was developed to simulate the column dynamics of the adsorption systems. This model is based on non-equilibrium, non-isothermal and non-adiabatic conditions, and axial dispersion and heat conduction are also considered. Heat transfer resistances are considered in gas-solid, gas-column wall and column wall-outside air. The LDF(Linear Driving Force) approximation model describes the mass transfer rate between the gas and solid phase. This study shows that the recovery of toluene by PTSA is more preferable than that by general TSA.