3-메틸아미노프로필아민과 N-메틸-2-피롤리돈을 포함한 저수계 흡수제의 CO2 포집 특성

홍연기,왕슈아이,홍정현,유정균 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.4

Conventional aqueous amine-based CO2 capture has a problem in that a large amount of renewable energy is required for CO2 stripping and solvent regeneration in its industrial applications. This work proposes a water-lean absorbent that can reduce regeneration energy by lowering the water content in the absorbent with high absorption capacity for CO2. To this purpose, this water-lean solvent introduced NMP (N-methyl-2-pyrrolidone), which has a higher physical solubility in CO2 and a low specific heat capacity comparing to water, along with 3-methylaminopropylamine (MAPA), a diamine, into the absorbent. The circulating absorption capacity and absorption rate for CO2 of this water-lean solvent were measured using a packed tower. When NMP was added to the absorbent, the absorption rate was improved. In the case of the absorbent containing 2.5M MAPA was used, the maximum circulating absorption capacity was obtained when 10 wt% of NMP was included in absorbent. The overall mass transfer coefficient increased as the concentration of NMP increased. However, at loading values higher than 0.5, the increment in mass transfer coefficient decreased as the concentration of NMP increased. When the lean loading value is low, the mass transfer resistance due to viscosity of the absorbent is low, so the overall mass transfer coefficient increases with the addition of NMP. However, as the lean loading value increases, the viscosity of the absorbent increases, and the diffusivity of CO2 and MAPA decreases, resulting in sharply decreasing of the overall mass transfer coefficient.

Separation performance investigation of packed distillation columns using simple NEQ approach based on packing multicomponent efficiencies and effective mass transfer coefficients

Hadi Poortalari,Javad karimi Sabet,Farshad Varaminian 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5

A simple non-equilibrium modeling approach is proposed to simulate multicomponent distillation process in packed columns. The real behavior of the column is simply considered by the evaluation of interphase mass transfer rate based on the overall mass transfer coefficient. Two distinct methods are used to calculate this overall coefficient including the effective mass transfer coefficient method and the packing efficiency method. The modelling procedure consists of an iterative segment-wise algorithm implemented in a MATLAB home-code. For verification, the obtained composition profiles from a structured and a random packed column are compared with reported experimental data. Comparisons show that the packing efficiency-based model could acceptably predict the experimental profiles with an average relative deviation of 18% and 25% for structured and random packed columns, respectively. This confirms that our simple non-equilibrium approach is a reliable and robust model for the performance evaluation of packed columns.

젖은 벽탑을 이용한 디에틸렌트리아민과 디에틸에탄올아민 수용액의 CO₂ 흡수속도 측정

유정균 ( Jong Kyun You ),이준 ( Jun Lee ),홍연기 ( Yeon Ki Hong ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4

연소 배가스 중 CO2를 포집하기 위한 에너지 저감형 흡수제로 상분리 흡수제가 주목 받고 있다. 본 연구에서는 2종의 아민을 혼합한 상분리 흡수제 중 하나인 디에틸렌트리아민(diethylenetriamine, DETA)과 디에틸아미노에탄올(diethylaminoethanol, DEEA) 흡수제를 구성하는 DETA와 DEEA 각각의 흡수 속도를 측정하기 위해 젖은 벽탑을 사용하였다. 총괄 물질전달 계수에 대한 DETA 및 DEEA의 농도와 조업 온도에 따른 영향을 고찰하였다. 그 결과 DETA 농도에 따라 총괄 물질전달 계수는 비례하였지만 DEEA 농도의 경우 그 영향이 적었고 일정 농도를 넘어설 경우 총괄 물질전달 계수가 감소하였다. DETA 수용액은 조업 온도에 따라 총괄 물질전달 계수의 변화가 적었던 반면 DEEA 수용액은 조업 온도에 따라 총괄 물질전달 계수가 증가하였다. 의사 1차 반응 가정 하에서 관찰 반응 속도 상수를 구한 결과 DETA 수용액에서의 관찰 반응속도 상수는 DETA 농도에 따라 비례하는 관계를 가지나 DEEA는 의사 1차 반응 가정에 맞지 않는 것으로 나타났다. Biphasic solvents are attracting attention as energy-reducing solvents for capturing CO₂ from flue gas in combustion process. In this study, considering diethylenetriamine (DETA) and diethylethanolamine (DEEA) mixed solvents, one of the biphasic solvents by blending of two types of amines, the CO₂ absorption rates of DETA and DEEA was measured by wetted wall column. The effects of DETA and DEEA concentrations and operating temperature on the overall mass transfer coefficient were investigated. As a result, the overall mass transfer coefficient was proportional to the DETA concentration. However, in the case of the DEEA concentration, the effect was small and when the concentration was exceeded, the overall mass transfer coefficient decreased. The DETA aqueous solution showed little change in the overall mass transfer coefficient with the operating temperature, whereas the DEEA aqueous solution increased the overall mass transfer coefficient with the operating temperature. As a result of obtaining the observed reaction rate constant under the pseudo-first-order reaction assumption, it was found that the observed reaction rate constant in DETA aqueous solution was proportional to the DETA concentration, but DEEA did not fit the pseudo-firstorder reaction assumption.

β-Glucan 추출에 미치는 온도, 용매 농도 및 pH의 영향

이상훈,장귀영,김기종,이미자,김태집,이준수,정헌상,Lee, Sang Hoon,Jang, Gwi Yeong,Kim, Kee Jong,Lee, Mi Ja,Kim, Tae Jip,Lee, Junsoo,Jeong, Heon Sang 한국식품영양학회 2012 韓國食品營養學會誌 Vol.25 No.4

추출조건에 따른 귀리겨 ${\beta}$-glucan의 추출조건을 확립하기 위하여 추출온도($40{\sim}60^{\circ}C$), 추출용매의 에탄올 농도(0~20%) 및 pH(5~9)를 변수로 중심합성계획법으로 설계하여 ${\beta}$-glucan 추출특성을 조사하였다. 추출시간의 증가에 따라 ${\beta}$-glucan의 추출속도는 추출초기에 급격히 증가하였으나, 이후에는 완만하였다. 총괄물질전달계수는 $3.363{\sim}8.552{\times}10^{-6}cm/min$ 범위로 낮은 추출온도에서는 추출용매의 농도가 낮을수록, 높은 추출온도에서는 추출용매의 농도가 높을수록 증가하였지만 pH에 의한 영향은 적은 것으로 나타났다. 추출용매의 pH는 중성일 때보다 산성이나 알칼리성일 때 ${\beta}$-glucan의 추출량이 증가하였다. 추출조건에 따라서 ${\beta}$-glucan 수용액의 점도는 유의적인 차이를 보였으며, 총괄물질전달계수가 높을수록 crude ${\beta}$-glucan 수용액의 점도가 높게 나타났으며, 점도, 추출율 및 총괄물질전달계수의 상관관계를 분석한 결과, 각각의 요인들이 높은 양의 상관관계(p<0.01)를 나타내었다. This study investigated the effects of temperature, solvent concentration, and pH on the ${\beta}$-glucan extraction. Oat bran ${\beta}$-glucan was extracted with different extraction conditions, using various combinations of experiment factors, such as temperature (40, 45, 50, 55, and $60^{\circ}C$), ethanol concentration (0, 5, 10, 15, and 20%), and pH (5, 6, 7, 8, and 9). Under the various extraction conditions, ${\beta}$-glucan extraction rate and overall mass transfer coefficient of oat bran ${\beta}$-glucan, and viscosity of oat bran extracts were investigated. As increasing the extraction time, the extraction rate of ${\beta}$-glucan increased. The overall mass transfer coefficient of ${\beta}$-glucan ranged from $3.36{\times}10^{-6}$ to $8.55{\times}10^{-6}cm/min$, indicating the lowest at the extraction condition of $45^{\circ}C$, 15% and pH 8, and the highest at $50^{\circ}C$, 0% and pH 7. It was significantly greater with increasing extraction temperature and decreasing ethanol concentrations of extraction solvent, except for solvent pH. There were positive correlations among the overall mass transfer coefficient, the extraction rate of ${\beta}$-glucan, and the viscosity of extract.

Energy and Environmental Engineering : Mass Transfer Characteristics and Overall Mass Transfer Coefficient in the Ozone Contactor

( Jung A Rhim ),( Jeong Hyo Yoon ) 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.2

내부순환반응기의 scale-up에 따른 동력학적 특성의 변화

최윤찬,박영식,서정호,김동석,송승구 한국환경과학회 1997 한국환경과학회지 Vol.6 No.1

The variations of gas hold-up, overall volumetric oxygen mass transfer coefficients and liquid circulation velocity in an internal loop reactor were investigated to manifest scale-up effect. The relationship between superficial gas velocity and gas hold-up were found as Ugr = 0.045 εr in the pilot-scale and Ugr = 0.056 εr in the bench-scale reactor. The overall volumetric oxygen mass transfer coefficient, K_La was slightly increased in the pilotscale than in the bench-scale reactor. Flow regime was changed from the bubble flow to the churn-turbulent flow when the superficial gas velocity reached to 3.5 - 4 ㎝/sec in the pilot-scale.

이유체 벤츄리형 선회 노즐이 장착된 제트 루프 반응기에서 합성폐수 중의 암모니아 제거특성

노다지(Da-ji Noh),윤찬수(Chan-Su Yun),임준혁(Jun-Heok Lim),원용선(Yong-Sun Won),이태윤(Tae-Yoon Lee),이제근(Jea-Keun Lee) 한국청정기술학회 2017 청정기술 Vol.23 No.2

본 연구에서는 합성폐수로부터 암모니아 탈기 시 이유체 벤츄리형 선회 노즐이 장착된 제트 루프 반응기의 성능을 평가하고자 하였다. 이를 위해 이유체 벤츄리형 선회 노즐과 일반 노즐이 장착된 각각의 제트 루프 반응기를 이용하여 조업조건 변화에 따른 암모니아 제거효율과 총괄물질전달계수(KLa)를 각각 얻은 후, 이를 통해 성능을 비교하였다. 운전변수로는 pH(pH = 10-12), 액체순환유량(QL = 25-35 L min<SUP>-1</SUP>), 공기유입량(QG = 5-20 L min<SUP>-1</SUP>)을 변화시키며 실험하였다. 실험결과, 동일한 조업조건에서 이유체 벤츄리형 선회 노즐(two-fluid venturi-type swirl nozzle, TVSN)이 장착된 제트 루프 반응기가 이유체 벤츄리형 일반 노즐(two-fluid venturi-type conventional nozzle, TVCN)이 장착된 제트 루프 반응기보다 암모니아 제거효율과 KLa가 높게 나타났다. 이와 같은 결과는 이유체 벤츄리형 선회 노즐이 장착된 제트 루프 반응기에서 형성된 선회류 흐름에 의해 난류강도가 이유체 벤츄리형 일반 노즐이 장착된 제트 루프 반응기에 비해 높기 때문이라 판단된다. 또한, 실험조건 범위에서 KLa는 pH, 공기유입량 및 액체순환유량이 증가할수록 증가하는 경향을 보였으며, 특히, 실험변수 중 공기유입량이 pH나 액체순환유량에 비해 KLa에 미치는 영향이 큰 것으로 나타났다. We investigated the performance of a jet loop reactor (JLR) with the two-fluid venturi-type swirl nozzle (TVSN) during experiment for ammonia removal by air stripping from a synthetic wastewater, and compared it with that of a JLR with the two-fluid venturi-type conventional nozzle (TVCN), with the variation of pH, liquid circulation rate (QL), and air flow rate (QG). Their performance levels were compared based on the ammonia removal efficiency and overall mass transfer coefficient (KLa). Investigated parameters in a JLR were pH (10-12), air flow rate (QG = 5-20 L min<SUP>-1</SUP>), and liquid circulation rate (QL = 25-35 L min<SUP>-1</SUP>). Throughout the experiment, the ammonia removal efficiency and KLa in a JLR with TVSN was higher than in a JLR with TVCN. This may be due to the enhanced turbulent intensity by swirling flow formed in the JLR with TVSN compared to that with TVCN. Further, we obtained higher KLa when pH, QL and QG were increased. In particular, KLa was increased more efficiently by increasing QG than by increasing pH and QL.

버블 크기 측정을 위한 새로운 방법의 검증 및 버블 시스템 분석을 위한 활용

유엽,가성빈,문일,김정환,조형태 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1

오미자의 열수 추출시 용해도와 총괄물질전달계수

권영안,목철균,박종현,이승주 한국산업식품공학회 1999 산업 식품공학 Vol.3 No.4

Articles : Reactive Extraction of Lactic Acid in a Packed Column

( Dong Hoon Han ),( Won Hi Hong ) 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.3