• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.411-414
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• 2008

본 논문에서는 $CO_2$ 분리용 활성탄의 표면분석 및 흡착속도를 비교하였다. TGA 방법에 의한 흡착속도 데이터를 획득함으로써 분리장치 설계를 위한 기초자료를 획득하였고, 흡착온도에 따른 결과는 흡착온도가 낮을수록, 흡착량이 증가하고 흡착속도 또한 더 빠름을 알 수 있었다.

• Food Science and Preservation
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• v.11 no.1
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• pp.47-52
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• 2004

This study was conducted to investigate the characteristics of ultrafiltration and spray drying process for crude protein bound polysaccharide(CPBP) isolated from Agaricus blasei Murill. In ultrafiltration process, the permeate flux increased with the increase of operating pressure and temperature. The permeate flux declined continuously while the fouling materials were accumulated on the membrane as the operation time increased. In comparing of raw CPBP and filtered CPBP, the viscosity of CPBP treated UF was decreased and $\Delta$E value of treated samples was increased. Thermal efficiencies of spray drying process were increased by increasing inlet temperature, feed rate and feed concentration.

• Membrane Journal
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• v.33 no.6
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• pp.369-376
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• 2023

In this study, the alternative to the energy-intensive conventional vacuum distillation process, an eco-friendly and energy-efficient pervaporation separation was employed in 1,2 hexane diol/water (HDO/water) mixture. The crosslinked PVA-glutaraldehyde was coated inside the alumina hollow fiber membrane (Al-HF). In the HDO/IPA pervaporation separation, optimization of the membrane concerning PVA/GA ratio, curing temperature, and pervaporation operating condition were performed. In the long-term stability test, the sustainable pervaporation separation performance giving flux in the range of 1.90~2.16 kg/m²h, and water content in permeate was higher than 99.5% (separation factor = 68) was obtained from the PVA/GA (molar ratio = 0.08, curing temperature = 80℃) coated Al-HF membrane from HDO/water (25/75, w/w, %) mixture at 40℃. Therefore, this work provides potential and inspiration for PVA-based membranes to mitigate excessive energy requirements in HDO/water separation by pervaporation.

• Membrane Journal
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• v.22 no.2
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• pp.120-127
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• 2012

In this study, separation of ethylbenzene from mixed xylene was performed by using TS-1 zeolite membrane. TS-1 zeolite membranes were prepared by microwave synthesis and changing the reaction temperature. MFI-type TS-1 membranes are synthesized on alumina tubes by functional coating using 3-chloropropyltrimethoxysilane (3CP-TMS). On top surface of interlayer, nano TS-1 crystals were seeded. To form interlayer, microwave-assisted growth of TS-1 zeolite was carried out and thin zeolite layers were produced. All of the prepared membranes are tested to separate ethylbenzene from mixed xylene at different operating temperatures. TS-1 membrane with zeolite seed synthesized at $170^{\circ}C$ compared to 120, $140^{\circ}C$ shows the best ethylbenzene separation at the operation temperature of $200^{\circ}C$ from ternary mixed xylene containing certain composition of ethylbenzene/p-xylene/m-xylene. (separation factor : 2.64, ethylbenzene flux : 1703.0 mol/$m^2{\cdot}s{\cdot}Pa$).

• Korean Chemical Engineering Research
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• v.57 no.1
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• pp.11-16
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• 2019

$La_{0.6}Sr_{0.4}Ti_{0.3}Fe_{0.7}O_{3-{\delta}}$(LSTF) coated $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$(BSCF) membranes which has properties of high oxygen permeability and stability to $CO_2$ were applied to a bench scale apparatus to conduct oxygen permeation experiments. Also, the membranes of the laboratory and the bench scale device were divided into three regions according to the temperature gradient in the membrane reactor for comparative analysis. While oxygen permeation experiment were conducted up to $900^{\circ}C$, temperature dependence of Cr deposition was investigated. As a result, it was confirmed that the oxygen permeability was $2.37ml/min{\cdot}cm^2$, which was significantly lower than $3.79ml/min{\cdot}cm^2$ measured in the laboratory apparatus. It was found through XRD and SEM/EDS analysis that the decrease in oxygen permeability was originated from the deposition of gaseous Cr on the membrane surface released from the alloy material of the housing. In particular, a large amount of Cr was found in the medium temperature region.

• Korean Journal of Food Science and Technology
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• v.19 no.3
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• pp.225-230
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• 1987

The foam separation of bovine serum proteins was investigated and the protein fractionation by foam separation was analyzed by PAG electrophoresis. The protein concentration for the surface excess formation of bovine serum was in the range of $20-800\;{\mu}g/ml$. At pH 5, the foamate volume was maximum, but the enrichment ratio minimum. As the temperature was elevated, the foamate volume decreased and the enrichment ratio increase. As the gas flow rate increased from 25 to 100 ml/min, the foamate volume decreased and the enrichment ratio increased. The enrichment ration became maximum when the added ionic strength of serum solution was in the range of 1-3 by the addition of different types of salts, and this was related to the reduction of surface tension of the solution. In general, BSA, ${\alpha}_1$, and ${\alpha}_2-globulins$, which have relatively small molecular weight and high hydrophobicity, moved easily to the foam, and the separation of protein fractions in the serum varied with the changes in pH, temperature, gas flow rate and ionic strength of the solution.

• Proceedings of the Membrane Society of Korea Conference
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• 1993.10a
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• pp.52-53
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• 1993

투과증발 분리를 위하여 여러가지 막 소재와 공정을 개발하기 위한 노력이 다방면에서 이루어지고 있으며, 이에 관한 자료도 많이 제시되고 있으나 고분자 분리막의 개발은 아직도 미흡한 상태이다. 한편 투과증발 분리는 공정자체는 매우 간단하면서도 분리막의 투과성능에 따라 분리효율이 달라지기 때문에 여러종류의 막의 개발이 필요하다. 따라서 본 연구에서는 물/유기용제 혼합액에서 물을 분리하기 위하여 친수성이 강한 두 고분자 재료인 poly(vinyl alcohol)(PVA)와 carboxymehtylcellulose(CMC)를 브랜드하여 목적하는 분리기능을 갖는 새로운 막을 제조하여, 물/유기용제, 혼합액의 분리특성을 브랜드비와 온도 및 농도 그리고 분리시간에 따라 각각 검토하였다.

• Proceedings of the Membrane Society of Korea Conference
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• 1994.10a
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• pp.46-55
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• 1994

오늘날 막분리공정의 응용은 다른 분리공정에 비해 경제성과 편리성으로 비교우위에 있어 점차로 사용규모면에 있어서 증대되고 있다. 예를 들면, 바닷물을 음용수로 전환하거나 식품이나 의약공업에서 고분자화합물을 정제, 농축, 분리할 뿐만아니라 신장에서 불순물을 제거에 이르기까지 확대발전되어오고 있으며 화공약품의 분리회수, 초순수화나 환경산업의 폐수처리, 가스의 분리와 회수등의 응용에 이르기까지 쓰임새가 다양하며, 앞으로의 응용범위는 새로운 기능의 분리막개발과 함께 점점 확대되고 있다. 이와같은 막분리공정상 물질전달의 기본적특성인 추진력과 물리적인 성질의 중요성을 이해하는 것은 막분리공정을 설계제작하는데 필요하다. 막내에서 물질전달은 분리코져하는 물질의 확산, 전기장에의한 대류속도, 농도, 압력, 흡착 그리고 온도구배 등 물질이동현상을 조절하는 인자들 뿐만아니라 막의 물리적, 화학적 특성과 분리대상물질의 물리화학적 특성등에 의해 결정된다. 이러한 막내에서의 추진력들은 서로 상호 보완적이고 경우에 따라서는 새로운 효과를 나타낼 수 있다. 본 논문에서는 추진력에 따른 막물질이동에 영향을 주는 요소들을 저자가 경험한 결과들을 토대로 총론형식으로 열거하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.151.2-151.2
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• 2010

본 연구는 하이드로퀴논(HQ)을 이용하여 매립가스로부터 이산화탄소를 선택적으로 분리하고 유기 크러스레이트 형태로 분리 및 저장에 적용하기 위한 연구로써 하이드로퀴논을 다양한 객체가스와 반응시키면서 열역학적 안정영역을 파악하고 분광학적 방법을 이용하여 미세구조 변화를 분석하고자 하였다. 먼저 ${\alpha}$-HQ를 고압(4MPa)의 이산화탄소와 반응시켜 이산화탄소가 포집된 ${\beta}$-HQ를 합성하였고, 동공 내에 존재하는 이산화탄소를 제거하여 동공을 유지하는 empty ${\beta}$-HQ를 만들었다. 온도를 증가시키면서 XRD 패턴을 측정한 결과 298 K 에서 378 K 사이에서 ${\beta}$-HQ 시료는 서서히 empty ${\beta}$-HQ 의 구조로 전환되었으며 378 K 이상의 온도에서 ${\alpha}$-HQ 구조로 급격히 전환되었다. 또한 생성된 empty ${\beta}$-HQ 동공에 이산화탄소가 포집, 해리되는데 있어서 온도의 영향을 확인하기 위해 298K과 343K의 온도에서 실시간 라만분광법으로 측정하였다. 그 결과 298K에서 약 200분의 시간이 지난 후 이산화탄소는 하이드로퀴논 동공 내로 포집되어 안정화되었으며 압력해방 후에는 빠져나가지 않고 동공 내에 존재함을 확인하였다. 그러나 343K에서는 급격히 포집되어 30분 이내 안정화되었고, 압력해방 후 동공 내에 존재하지 못하고 빠져나가는 것을 확인하였다. Empty ${\beta}$-HQ의 이산화탄소 선택도를 관찰하기 위해 이산화탄소와 메탄, 수소, 질소의 조성이 각각 30%, 30%, 20%, 20%인 혼합가스와 반응시킨 후 가스 크로마토그래프 분석을 실시한 결과, empty ${\beta}$-HQ내 포집된 가스 중 이산화탄소의 조성이 약 80% 이상으로 나타나 높은 선택도를 나타냄을 관찰하였다.

• Journal of the Korea Organic Resources Recycling Association
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• v.6 no.1
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• pp.43-52
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• 1998

The objective of this study is to investigate the optimum conditions of extracting collagen without chrome ion from the leather waste. The effect of temperature, pH, and the concentration of alkaline solution on the collagen extraction has been studied. The result indicated that the incipient denatured temperature of collagen measured by viscosity was $25^{\circ}C$ and the complete denatured temperature was $31.5^{\circ}C$. The optimum solubilization condition for temperature was between $15^{\circ}C$ and $20^{\circ}C$, pH was 1.5, the concentration of alkaline solution was 3% of sodium hydroxide. The almost complete chrome ion separation was possible around the pH of 1.5. The separation efficiency of chrome ion from tannery waste was more than 99.5%. Extraction efficiency of crude protein from leather waste was about 89.5%. The hydroxyproline and collagen content in the extracted crude protein were 8.53% and 63.62%, respectively.