Recovery of CO_(2) from Flue Gas Using Gas Hydrate: Thermodynamic Verification through Phase Equilibrium Measurements

SEONG-PIL KANG; HUEN LEE

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Recovery of CO_(2) from Flue Gas Using Gas Hydrate: Thermodynamic Verification through Phase Equilibrium Measurements

机译：Recovery of CO_(2) from Flue Gas Using Gas Hydrate: Thermodynamic Verification through Phase Equilibrium Measurements

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The main purpose of this study was to develop a new hydrate-based gas separation (HBGS) process especially for recovering CO_(2) from flue gas. Temperature and pressure conditions for hydrate formation have been closely examined at the various CO_(2) concentrations of flue gases. Tetrahydrofuran (THF) chosen as a hydrate promoter can also participate in forming hydrates and produces a mixed hydrate together with CO_(2). The hydrate stability region was greatly expanded by using THF for lowering the equilibrium formation pressure. To confirm thermodynamic validity of the HBGS process, the three-phase equilibria of hydrate, liquid, and vapor were measured for the systems comprising CO_(2), N_(2) and water with or without THF in the temperature range of 272-295 K. In addition, two phase equilibria of hydrate and vapor were experimentally investigated for the same systems at several temperatures. Through close examination of the overall experimental results, it was firmly verified that the HBGS process makes it possible to recover more than 99 mol % of CO_(2) from the flue gas. The key unit operations of the HBGS lie in hydrate formation and subsequent dissociation similarly to gas absorption and desorption using the sterically hindered amines. The HBGS provides several advantages over the conventional ones. First, the operational temperature is moderate in the range of 273-283 K, and continuous operation allows this process to treat a large amount of gaseous stream. Second, only a small amount of THF is needed together with water and therefore severe corrosion problem can be avoided. Third, the aqueous solution containing THF after dissociation can be easily recycled to the hydrator.

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来源
《Environmental Science & Technology: ES&T》 |2000年第20期|4397-4400|共4页
作者
SEONG-PIL KANG; HUEN LEE;
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作者单位

Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境化学;
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Recovery of CO_(2) from Flue Gas Using Gas Hydrate: Thermodynamic Verification through Phase Equilibrium Measurements

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