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중공사막 접촉기를 통한 탄산칼륨 수용액으로의 이산화탄소 흡수거동 연구
염봉열,김민수,이용택,박유인,이규호 ( Bong Yeol Yeom,Minsoo Kim,Yongtaek Lee,You In Park,Kew Ho Lee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
The effects of various system parameters on the absorption of carbon dioxide into the absorbent liquid were investigated in a hydrophobic microporous hollow fiber membrane contactor with a configuration of countercurrent. An aqueous potassium carbonate solution was used as an absorbent and its permeation results were compared to those obtained with pure water to figure out the effect af chemical reaction. The mixture of carbon dioxide and nitrogen wav used ar an inlet gas and the pore condition of the hollow fiber membrane was hold to be nonwetted through an appropriate control of pressures of a mixture gas and an absorbent. In case of an aqueous potassium carbonate solution used as am absorbent, the permeation rate of carbon dioxide was about 4-6 times higher than that in pure water. The permeation rate was increased with the increments of the concentration of potassium carbonate in an absorbent, the pressure and the flow rate of a mixture gas.
Boehmite Nanoparticles Incorporated Electrospun Nylon-6 Nanofiber Web for New Electret Filter Media
염봉열,심은경,Behnam Pourdeyhimi 한국고분자학회 2010 Macromolecular Research Vol.18 No.9
Nylon-6 (PA6) nanofiber webs incorporated with boehmite nanoparticles as an electrostatic charging agent were electrospun and their fiber morphology was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM showed that the median fiber diameter of the PA6 nanofibers was 73 nm and boehmite nanoparticles had little effect on the fiber diameter. The filtration performance of the nanofiber web was measured using 0.3 micron DOP aerosols at a 5.3 cm/s face velocity. Processed and corona charged PA6nanofiber web showed significant improvement in the submicron aerosol capture efficiency without a change in the air flow resistance compared to the discharged nanofiber web. These results suggest that the electrospinning process imparted electrostatic charge efficiently on the PA6 nanofiber web, and the electrostatic surface potential of a nanofiber web is increased with the incorporation of boehmite nanoparticles.
염봉열,이용택 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.1
A computer program was developed that could predict the permeation rates of CO₂across the liquid membrane using potassium carbonate as a transport carrier. This program was coded with the FORTRAN language to be used for an IBM compatible personal computer. The permeation rates of CO₂were predicted with various operating parameters such as a thickness of liquid membrane, a partial pressure of CO₂, a concentration of transport carrier, and a system temperature. Since the previous studies on the facilitation transport of CO₂have been performed at the room temperature using the constant carrier concentration, their results could not be utilized in a broad operating condition. As the temperature increases 50℃ higher than the room temperature of 25℃, the typical facilitation factor increases with a factor of minimum 5, depending on the membrane thickness with the other typical conditions. It should be noted that the facilitation factor increases significantly as the membrane thickness increases at higher temperature while the facilitation factor increases slowly at lower temperature. It was found that the higher the concentration of the carrier is, the larger the permeation rate of CO₂is. However, the facilitation factors of CO₂at lower concentration of K₂CO₃are predicted to be higher with a sufficiently thin membrane where they are controlled by the diffusivities of ions rather than by the chemical reaction and the solubility of CO₂plays a major role.
탄산칼륨 수용액 액막을 통한 이산화탄소의 촉진수송에 미치는 온도와 수송담체 농도의 영향
이용택,염봉열,이용희,박유인,이규호 ( Yongtaek Lee,Bong Yeol Yeom,Yonghee Lee,You In Park,Kew Ho Lee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
Model analysis was carried out using the system controlling equations which include the reversible reactions of carbon dioxide with potasaium carbonate to predict the permeation behavior of carbon dioxide in a potassium carbonate liquid membrane. The physicochemical properties of reaction rate constants, equilibrium constants, solubility and diffusion coefficient were represented as a function of the concentration of carbonate ion and the temperature; the calculated solubility and the predicted diffusion coefficient were found to be identical to those published data. The permeation rates could be successfully predicted with several important parameters : the thickness of liquid membrane, the partial pressure of carbon dioxide, the concentration of carrier and the temperature. The increment of the permeation rate was represented in terms of the facilitation factor as a function of carrier concentration, It was found that the permeation rate of carbon dioxide increases significantly as the concentration of carrier increases. The facilitation factor considerably increases together with the permeation rate as the temperature increases. The effective operating conditions could be obtained through this model analysis for the permeation rate as well as the facilitation factor of carbon dioxide across the liquid membrane.
Gas Barrier성 SEBS (Styrene Ethylene Butadiene Styrene Copolymer)-Clay 하이브리드 막의 제조 및 물성
남상용,염봉열,민병렬,김영진,Nam Sang Yong,Yeom Bong Yeol,Min Byoung Ryul,Kim Young Jin 한국막학회 2005 멤브레인 Vol.15 No.1
본 연구에서는 SEBS와 여러 가지의 유기화물로 처리된 MMT (montmorillonite) type의 clay를 이용하여 SEBS-clay 하이브리드 막을 용융삽입법으로 제조하였다. clay의 함량은 5 phr (per hundred resin)로 고정하였다. internal mixer를 사용하여 clay를 SEBS에 분산시켰으며, 제조된 SEBS-clay 하이브리드에서 clay의 특성피크가 완전히 박리되거나 이동하는 XRD 결과로부터 clay의 층간거리가 넓어지는 고분자의 clay 층간삽입을 확인하였다. Clay의 종류에 따라서 제조된 SEBS-clay 하이브리드 막의 가스투과도, 기계적 물성 및 열적 성질을 측정하였다. SEBS-clay 하이브리드 막은 clay 자체의 도입과 층간거리의 확대로 기체분자의 tortuosity를 증가시켜서 가스투과도를 저하시키는 것을 확인하였다. SEBS-clay hybrid membranes were prepared by melt intercalation method with internal mixer. In the hybrid, the amount of clay content was fixed to 5 phr. MMT was intercalated or exfoliated by the ionomer and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in SAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the SEBS-clay hybrid membranes were investigated. Gas permeability through the SEBS-clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in SEBS.
박종훈,염봉열,윤성진 대한설비공학회 2004 설비저널 Vol.33 No.4
최근 주거환경의 악화와 웰빙의 열풍으로 인해 실내 공기 및 물과 관련된 제품들의 개발이 활발히 일어나고 있다. 본고에서는 공기청정기의 변천사와 기반 연구 및 향후 진행방향에 대하여 논한다. 최근 중국에서의 황사가 연일 매섭게 불어오고 있고, TV나 신문, 잡지 등 매스컴에서는 신축 건물이나 아파트, 공공장소의 실내 공기질의 심각성에 대해 언급하며, 이에 대한 다양한 해결책이 제시되고 있다. 미국이나 일본 등 선진국에서는 이미 실내 공기를 오염시키는 유해가스 및 미생물, 방사성 동위원소 등의 원인물질을 규명하고, 원인물질에 따른 실내 공기 청정화 방법 등을 제시하거나 해결하기 위하여 많은 연구가 이루어지고 있다.(중략)
김희진,민병렬,염봉열,나성순 한국공업화학회 1999 응용화학 Vol.3 No.2
The recovery of trace volatile organic components from water by pervaporation was investigated. Permeation experiments through homogeneous polydimethylsiloxane (PDMS) membrane was carried out and the effect of feed concentrations and membrane thicknesses on the permeation characteristics were investigated. A solution-diffusion model is used to describe the pervaporation transport mechanism. In homogeneous PDMS membrane it appeared that the selectivities of MEK and toluene are constant, and that organic flux has a linear relationship with feed concentration. These results indicate that the coupling effects between organics were negligible. The selectivity of PDMS membranes is invariant with respect to the membrane thickness. The intrinsic membrane permeability of organic components determined by using a solution-diffusion model. Comparing with various composite type membrane, the membrane using PEG treated nonwoven fabric as sublayer showed the best performance in VOC recovery by pervaporation.