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염화탄화수소를 포함하는 혼합가스 하이드레이트의 상평형 및 분광학적인 해석

Phase Equilibria and Spectroscopic Analysis of Mixed Gas Hydrates Containing Chlorinated Hydrocarbons

서용원 이흔^† 강성필¹ 이상기¹ 박광호¹

Yongwon Seo Huen Lee^† Seong-Pil Kang¹ Sanggi Lee¹ Kwang-Ho Park¹

한국과학기술원 화학공학과, 대전 305-701 ¹LG화학 기술연구원, 대전 305-380

Dept. of Chemical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea ¹Research Park, LG Chemical Ltd., Daejeon 305-380, Korea

hlee@mail.kaist.ac.kr

HWAHAK KONGHAK, February 2002, 40(1), 57-62(6), NONE

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Abstract

본 연구에서는 수용액상의 염화탄화수소를 이산화탄소, 질소, 메탄 등의 보조기체를 사용하여 고체의 가스 하이드레이트를 형성시켜서 회수하는 새로운 분리 방법을 제안하였다. 이 방법의 가능성을 타진하기 위해 보조가스+물+염화탄화수소 계의 4상 평형을 측정하였고 실제 혼합 가스 하이드레이트의 구조와 포집된 분자들의 동공내 점유율을 알아보기 위해 NMR을 이용해 분석하였다. 4상 평형 결과는 van der Waals와 Platteeuw 모델에 기초한 예측 결과와 비교하였다. 보조 기체+물+염화탄화수소 계는 보조 기체+물계 보다 특정 온도에서 하이드레이트 형성 압력을 상당히 낮추는 것으로 나타났는데, 이는 염화탄화수소를 포함하는 혼합 가스 하이드레이트가 순수 하이드레이트에 비해 훨씬 더 안정화되어 있다는 것을 나타낸다. 염화탄화수소가 하이드레이트 형성 참여로 인한 안정화 효과의 순서는 다음과 같았다: 1,2-dichloroethane(CH2ClCH2Cl)

In this study, The formation of solid hydrates by certain chlorinated hydrocarbons methylene chloride(CH2Cl2), carbon tetrachloride(CCl4), 1,2-dichloroethane(CH2ClCH2Cl) and 1,1,1-trichloroethane(CH3CCl3) and water were attempted experimentally with nontoxic and common help gases such as CO2, CH4 and N2 for recovering chlorinated hydrocarbons from_x000D_ the aqueous solutions. To check the thermodynamic feasibility of this process the pressure and temperature ranges of hydrate stability region were carefully determined through measurement of four-phase equilibria(H-LW-LCHC-V) for help gas+water+chlorinated hydrocarbon systems. The help gas+water+chlorinated hydrocarbon systems greatly reduced the hydrate-forming pressure, which confirmed the mixed gas hydrates with chlorinated hydrocarbons more stabilized than the simple hydrates consisting of help gas and water. The degree of stabilization was found to follow the order of CH2ClCH2Cl

Keywords

Gas Hydrate Chlorinated Hydrocarbon Help Gas NMR

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