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Received October 20, 2003
Accepted April 26, 2004
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Sodium Salt of Bis(2,2,3,3,4,4,5,5-octafluoro-1-pentanol) Sulfosuccinate를 이용한 초임계이산화탄소 + 물 계 마이크로에멀젼내에서 유기용매의 영향
The Effect of Organic Solvent in Supercritical CO2 + Water Microemulsion with Sodium Salt of Bis(2,2,3,3,4,4,5,5-octafluoro-1-Pentanol) Sulfosuccinate
한국과학기술연구원 국가지정 초임계유체연구실, 136-791 서울시 성북구 하월곡동 39-1 1연세대학교 화학공학과, 120-749 서울시 서대문구 신촌동 134 2서강대학교 화공생명공학과, 121-742 서울시 마포구 신수동 1
Supercritical Fluids Research Lab., Korea Institute of Science and Technology, 39-1, Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Korea 1Department of Chemical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea 2Department of Chemical and Biomolecular Engineering, Sogang University, 1, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea
limjs@sogang.ac.kr
Korean Chemical Engineering Research, June 2004, 42(3), 296-303(8), NONE Epub 12 July 2004
Abstract
본 연구에서는 물과 이산화탄소의 마이크로에멀젼 형성과 상거동에 관한 연구를 실시하였으며, 유기용매를 첨가하여 이에 대한 영향을 살펴보았다. 물과 이산화탄소의 마이크로에멀젼을 형성시키기 위하여 친수기와 친이산화탄소기를 동시에 지닌 sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-1-pentanol) sulfosuccinate (F-AOT)계면활성제를 사용하였다. 사용된 유기용매는 iso-propanol, n-propanol, ethanol, methanol (그룹 1), tetrahydrofuran, pyridine, 2-methoxyethanol (그룹 2), acetonitrile, acetone, 1,4-dioxane (그룹 3) 10종의 물질로 세 가지 그룹으로 분류되었으며, 유기용매를 {초임계이산화탄소 + 물} 계에 일정량 첨가하여 이에 따른 마이크로에멀젼의 cloud point변화 및 그 경향을 살펴보았다. 그룹 1의 유기용매가 첨가된 마이크로에멀젼의 cloud point는 methanol의 경우, 온도 범위 317.1-363.20 K에서 22.15-28.70 MPa, ethanol의 경우, 온도 범위 307.5-357.20 K에서 18.5-28.40 MPa, n-propanol의 경우, 온도 범위 307.20-365.30 K에서 17.40-28.32 MPa, iso-propanol의 경우, 온도 범위 309.15-365.60 K에서 15.15-26.49 MPa이였으며, 그룹 2의 유기용매가 첨가된 시스템의 cloud point는 2-methoxyethanol의 경우 307-356.1 K에서 18.8-26.3 MPa, tetrahydrofuran의 경우 309.1-68.2 K에서 18.6-27.9 MPa, pyridine의 경우 307.1-367.5 K에서 16.2-25.9 MPa을 나타내었다. 그룹 3의 유기용매가 첨가된 마이크로에멀젼의 cloud point는 acetonitrile이 첨가된 경우, 307-359.3 K에서 16.52-26.74 MPa, acetone의 경우 308.15-367.0 K에서 19.3 - 28.2 MPa, 1,4-dioxane의 경우 309.15-364.15 K에서 20.1-28.8 MPa의 cloud point압력을 나타내었다. 실험결과, 10종의 유기용매가 첨가된 모든 경우에 대해서 초임계 이산화탄소+물 계의 마이크로에멀젼의 cloud point는 유기용매가 첨가되지 않았을 때보다 더 낮아지는 것으로 나타났으며, 이것은 유기용매의 용해도 파라미터 및 연속상인 이산화탄소의 용해도 파라미터와 연관성이 있음을 알 수 있었다.
Phase behavior of the water in CO2 microemulsion that nano size water droplets were dispersed into CO2 were investigated, and considered the effect of the organic solvents on the phase behavior of this. In order to form the microemulsion, sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-1-pentanol) sulfosuccinate(F-AOT) surfactant which has CO2 philic chains and hydrophilic head group simultaneously was synthesized. The added ten organic solvents were iso-propanol, n-propanol, ethanol, methanol (group 1), tetrahydrofuran, pyridine, 2-methoxyethanol (group 2), acetonitrile, acetone, 1,4-dioxane (group 3). These organic solvents were added into water+surfactant+CO2 and the cloud points of this microemulsion were measured. In case that the organic solvents of group 1 were added into water+surfactant+CO2 microemulsion, the cloud points were 22.15-28.70 MPa (T = 317.1-363.20 K) for methanol, 18.5-28.40 MPa (T = 307.5-357.20 K) for ethanol, 17.40-28.32 MPa (T = 307.20-365.30 K) for n-propanol, 15.15-26.49 MPa (T = 309.15-365.60 K) for iso-propanol. In case of the organic solvent of group 2, the cloud points were 19.3-28.2 MPa (T = 308.15-367 K) for acetone, 18.8-26.3 MPa (T = 307-356.1 K) for 2-methoxyethanol, 18.6-27.9 MPa (T = 309.1-368.2 K) for tetrahydrofuran, 16.2- 25.9 MPa (T = 307.1-367.5 K) for pyridine. In case of the organic solvent of group 3, the cloud points were 16.52-26.74 MPa (T = 307-359.3 K) for acetonitrile, 19.3-28.2 MPa (T = 308.15-367.0 K) for acetone, and 20.1-28.8 MPa (T = 309.15-364.15 K) for 1,4-dioxane. According to the results, the cloud point of water+surfactant+organic solvent+CO2 becomes lower in adding the ten orgarnic solvents, and the phase behavior of this microemulsion was related to the solubility parameter of organic solvent and CO2.
Keywords
References
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Eastoe J, Nave S, Downer A, Paul A, Rankin A, Tribe K, Penfold J, Langmuir, 16(10), 4511 (2000)
Kim HW, Jin YW, Park KH, Kim HD, Yoon BH, Wai CM, "Metal Nanoparticle Synthesis and its Catalytic Organic Reactions in Water-in-CO2 Microemulsion using Fluorinated AOT," Proceedings of 1st International Symposium on Supercritical Fluid Technology for Energy and Environment Applications, 383-388 (2002)
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