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고리형 아민이 포함된 메탄 하이드레이트의 튜닝과 가스 저장 연구
박기훈,김동현,차민준,Ki Hun Park,Dong Hyun Kim,Minjun Cha 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
In this study, the tuning phenomena, gas storage capacity, and thermal expansion behaviors of binary (cyclopentylamine + CH<sub>4</sub>) and (cyclopropylamine + CH<sub>4</sub>) clathrate hydrates were investigated for the potential applications of clathrate hydrates to gas storage. To understand the tuning behaviors of binary (cyclopentylamine + CH<sub>4</sub>) and (cyclopropylamine + CH<sub>4</sub>) clathrate hydrates, <sup>13</sup>C solid-state NMR spectroscopy was used, and the results confirmed that maximum tuning factors for the binary (cyclopentylamine + CH<sub>4</sub>) and (cyclopropylamine + CH<sub>4</sub>) clathrate hydrates were achieved at 0.5 mol% and 1.0 mol% of guest concentration, respectively. The gas storage capacity of binary (cyclopentylamine + CH<sub>4</sub>) and (cyclopropylamine + CH<sub>4</sub>) clathrate hydrates were also checked, and the results showed the CH<sub>4</sub> capacity of our hydrate systems was superior to that of binary (tetrahydrofuran + CH<sub>4</sub>) and (cyclopentane + CH<sub>4</sub>) clathrate hydrates. The synchrotron diffraction patterns of these hydrates collected at 100, 150, 200, and 250 K confirmed the formation of a cubic Fd-3m hydrate. In addition, the lattice constant of clathrate hydrates with cyclopentylamine and methane were larger than that with cyclopropylamine and methane due to the effects of molecular size and shape.
정다운(Dawoon Jeong),차민준(Minjun Cha) 강원대학교 산업기술연구소 2020 産業技術硏究 Vol.40 No.1
In this study, the effects of thermodynamic hydrate inhibitors on hydrate formation and dissociation behaviors were identified. The nucleation and growth of CP hydrate in the presence of methanol were monitored by optical microscope. Cyclopentane was used to demonstrate the oil phase in the pipeline in this study. Hydrate morphology, required time for hydrate formation, hydrate dissociation temperature were also identified by experiments. With the addition of methanol in water solution, the hydrate nucleation as well as hydrate growth were delayed. Moreover, hydrate morphology was also varied with the addition of methanol. Hydrate formation and dissociation temperature also decrease as the concentration of methanol increases.
Lattice Contraction Behavior Occurring in Ionic Clathrate Hydrate
권민철(Kwon, Minchul),차민준(Cha, Minjun),신규철(Shin, Kyuchul),이흔(Lee, Huen) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Unlike non-ionic clathrate hydrates stably formed by van der Waals interaction between a guest molecule and a surrounding host framework, ionic clathrate hydrates are stabilized by ionic interaction between an ionic guest molecule and the host water-framework. Here, we firstly described the stable entrapment of the superoxide ions in {gamma}-irradiated Me₄NOH+O₂ hydrate. Owing to peculiar direct guest-guest ionic interaction, the lattice structure of {gamma}-irradiated Me₄NOH+O₂ hydrate shows significant change of lattice contraction behavior even at relatively high temperature(120K). Particularly, we note that ionic-induced dimensional change is much greater than thermal-induced change. Such findings are expected to provide useful information for a better understanding of unrevealed nature of clathrate hydrate fields.
윤여범(Youn, Yeobeom),차민준(Cha, Minjun),권민철(Kwon, Minchul),이흔(Lee, Huen) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Structure-II hydrate has been highlighted due to its higher gas storage capacity and favorable thermodynamic conditions. In this study, we introduce a new structure-II hydrate former, tert-butyl hydroperoxide (TBHP) and confirm the structural characteristics through High-Resolution Powder Diffraction (HRPD), ^{13}C solide-state NMR and Ramanspectroscopy. Here,we also investigated the thermodynamic stability of binary(TBHP+gaseous) clathrate hydrates. The experimental data were generated using an isochoric pressure-search method. The dissociation data for (TBHP +gaseous) clathrate hydrates are compared with the other hydrocarbon hydrate and pure gaseous hydrate.
에틸렌글리콜과 염이 포함된 메탄 하이드레이트의 상평형과 형성 거동
김동현 ( Dong Hyun Kim ),박기훈 ( Ki Hun Park ),차민준 ( Minjun Cha ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.4
In this study, phase equilibria and formation behaviors of methane hydrate containing mono-ethylene glycol (MEG) and salts (sodium chloride, NaCl; sodium bromide, NaBr; sodium iodide, NaI) are investigated. Equilibrium conditions of methane hydrate containing MEG and salts are measured in a temperature range 272~283 K and a pressure range 3.5~11 MPa. Hydrate inhibition performance in the presence of additives can be summarized as follows: methane hydrate containing (5 wt% NaCl + 10 wt% MEG) > (5 wt% NaBr + 10 wt% MEG) > (5 wt% NaI + 10 wt% MEG). Formation behaviors of methane hydrate with MEG and salts are investigated for analyzing the induction time, gas consumption amount and growth rate of methane hydrates. There are no significant changes in the induction time during methane hydrate formation, but the addition of MEG and salts solution during hydrate formation can affect the gas consumption amount and growth rate.