http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Separation of CO2 from flue gases using hydroquinone clathrate compounds
이종원,Pratik Dotel,Jeasung Park,윤지호 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.12
Hydroquinone (HQ) samples reacting with (CO2+N2) gas mixtures with various compositions at pressures ranging from 10 to 50 bar are analyzed using spectroscopic methods and an elemental analyzer. The results indicate that while both CO2 and N2 can react with HQ to form clathrate compounds, CO2 has higher selectivity than N2. In particular, at an operating pressure of 20 bar or greater, the CO2 content in the clathrate compound is 85mol% or higher regardless of the feed gas composition. Moreover, if a two-step clathrate-based process is adapted, CO2 at a rate of 93 mol% or higher can be recovered from flue gases. Thus, the clathrate compound described here can be used as a CO2 separation/recovery medium for CO2 in flue gases.
Seo, Youngrok,Moon, Donghyun,Lee, Changho,Park, Jeong-Woo,Kim, Byeong-Soo,Lee, Gang-Woo,Dotel, Pratik,Lee, Jong-Won,Cha, Minjun,Yoon, Ji-Ho American Chemical Society 2015 Environmental science & technology Vol.49 No.10
<P>Many studies have focused on desalination via hydrate formation; however, for their potential application, knowledge pertaining to thermodynamic stability, formation kinetics, and guest occupation behavior in clathrate hydrates needs to be determined. Herein, the phase equilibria of SF<SUB>6</SUB> hydrates in the presence of NaCl solutions (0, 2, 4, and 10 wt %) were monitored in the temperature range of 277–286 K and under pressures of up to 1.4 MPa. The formation kinetics of SF<SUB>6</SUB> hydrates in the presence of NaCl solutions (0, 2, and 4 wt %) was also investigated. Gas consumption curves of SF<SUB>6</SUB> hydrates showed that a pure SF<SUB>6</SUB> hydrate system allowed fast hydrate growth as well as high conversion yield, whereas SF<SUB>6</SUB> hydrate in the presence of NaCl solutions showed retarded hydrate growth rate as well as low conversion yield. In addition, structural identification of SF<SUB>6</SUB> hydrates with and without NaCl solutions was performed using spectroscopic tools such as Raman spectroscopy and X-ray diffraction. The Raman spectrometer was also used to evaluate the temperature-dependent release behavior of guest molecules in SF<SUB>6</SUB> and SF<SUB>6</SUB> + 4 wt % NaCl hydrates. The results indicate that whereas SF<SUB>6</SUB> hydrate starts to decompose at around 240 K, the escape of SF<SUB>6</SUB> molecules in SF<SUB>6</SUB> + 4 wt % NaCl hydrate is initiated rapidly at around 205 K. The results of this study can provide a better understanding of guest–host interaction in electrolyte-containing systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-10/acs.est.5b00866/production/images/medium/es-2015-00866w_0007.gif'></P>