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L-Valine/전해질 및 L-Pro1ine/전해질 수용액에서 아미조산의 활동도계수와 용해도의 측정 및 모델링
이봉섭 ( Bong Seop Lee ),김기창 ( Ki Chang Kim ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.1
본 연구에서는 무기염인 NaCl, KCl, NaNO3 및 KNO3의 각 전해질과 L형 아미노산인 L-Valine 및 L-Proline이 용해된 아미노산/전해질 수용액에서 L-Valine 및 L-Proline의 활동도계수와 용해도를 298.15 K에서 측정하였다. 아미노산의 활동도계수는 양이온 및 음이온의 선택성 전극간의 기전력을 측정하는 전기화학 법으로 측정하였으며, 용해도는 아미노산의 고체상과 상평형을 이루고 있는 포화용액을 중량 분석하여 측정하였다. 실험적으로 측정된 전해질 및 아미노산의 활동도계수 값을 본 연구의 저자들이 수행한 지난번 연구[Korean Chem. Eng. Res. 48(4), 519(2010)]의 이론적 모델로 검토하였다. 실험을 수행한 8개의 아미노산/전해질 수용액에서 측정된 전해질 및 아미노산의 활동도계수 값은 지난번 연구의 이론적 모델에 잘 적용되는 경향을 보였으며, 또한 측정된 아미노산의 용해도 데이터도 지난번 연구 의 이론적 관계로 잘 묘사될 수 있었다.
이온성 액체의 황화수소의 포집을 위한 스크리닝 기법의 활용
한상일(Sangil Han),이봉섭(Bong-Seop Lee) 강원대학교 산업기술연구소 2019 産業技術硏究 Vol.39 No.1
Hydrogen sulfide (H 2 S) is mainly produced along with methane and hydrocarbons in many gas fields as well as hydrodesulfurization processes of crude oils containing sulfur compounds and the emission of H 2 S has a considerable effect on both environmental problem and human health aspects due to formation of, e.g. acid rain and smog. In recent years, ionic liquids (ILs) have been proposed as the most promising solvents for CO 2 and hazardous pollutants capture, such as H 2 S and sulfur dioxide (SO 2 ). In this work, we demonstrate the use of the predictive COSMO-SAC model for the prediction of Henry’s law constant of H 2 S in ILs. Furthermore, the method is used to screen for potential IL candidates for H 2 S capture from a set of 2,624 ILs formed from 82 cations and 32 anions. The effects of cation on the Henry’s law constant of H 2 S such as (i) the variation of the alkyl chain length on cation, (ii) the substituent of methyl group (-CH 3 ) for H in C(2) position and (iii) the change of ring structure for cation family are clearly predicted by COSMO-SAC model.
디젤기관에 있어서 대체연료 미강유의 분사 및 배기 배출물 특성
배명환(Myung-whan Bae),안계수(Gye-soo Ahn),이봉섭(Bong-seop Lee),하정호(Jeong-ho Ha) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In order to investigate the effect of heated temperature on fuel injection quantity for three kinds of fuels such as pure light oil, blends of rice bran oil with light oil and pure rice bran oil as a parameter of injection pump rack stroke. tests are performed by an injection pump tester at three kinds of cam shaft rotating speed. In this study, also, the effects of rice bran oil properties on the fuel economy and exhaust emissions are experimentally examined by a single cylinder, four cycle, direct injection, water-cooled and agricultural diesel engine operating at several loads and speeds. The kinematic viscosity of rice bran oil is very high compared with light oil. Also, the oxygen is not included at all in light oil, while the oxygen contents of 10.7% are included in rice bran oil. The fuel injection timing is fixed to 22° BTDC regardless of fuel type, engine loads and speeds. Results show that fuel injection quantity increases as injection pump rack stroke and cam shaft speed are elevated at the same conditions, and as heated temperature is elevated with the exception of light oil. It is also found that brake specific fuel consumption rate and NOx emissions increase, while soot emissions decrease as the blend rate of rice bran oil is enriched. Thus we can conclude that the differences of chemical and physical properties control the combustion process which affects the fuel economy and exhaust emissions of diesel engines using rice bran oil as a fuel.