SF6 Hydrate Formation in Various Reaction Media: A Preliminary Study on Hydrate-Based Greenhouse Gas Separation

2019 ◽  
Vol 53 (21) ◽  
pp. 12945-12952 ◽  
Author(s):  
Gyeol Ko ◽  
Yongwon Seo
Keyword(s):  
Greenhouse Gas ◽  
Gas Separation ◽  
Hydrate Formation ◽  
Preliminary Study ◽  
Reaction Media

scholarly journals Experimental Investigation of the Hydrate-Based Gas Separation of Synthetic Flue Gas with 5A Zeolite

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4556
Author(s):  
Xiaoya Zang ◽  
Na Zhang ◽  
Xuebing Zhou ◽  
Lihua Wan ◽  
Deqing Liang
Keyword(s):  
Water Content ◽  
Gas Separation ◽  
Flue Gas ◽  
Gas Adsorption ◽  
Physical Adsorption ◽  
Hydrate Formation ◽  
Co2 Separation ◽  
Type B ◽  
Influence Of Water ◽  
5A Zeolite

Coal combustion flue gas contains CO2, a greenhouse gas and driver of climate change. Therefore, CO2 separation and removal is necessary. Fortunately, 5A zeolites are highly porous and can be used as a CO2 adsorbent. In addition, they act as nuclei for hydrate formation. In this work, a composite technology, based on the physical adsorption of CO2 by 5A zeolite and hydrate-based gas separation, was used to separate CO2/N2 gas mixtures. The influence of water content, temperature, pressure, and particle size on gas adsorption and CO2 separation was studied, revealing that the CO2 separation ability of zeolite particles sized 150–180 μm was better than that of those sized 380–830 μm at 271.2 K and 273.2 K. When the zeolite particles were 150–180 μm (type-B zeolite) with a water content of 35.3%, the gas consumption per mole of water (ngas/nH2O ) reached the maximum, 0.048, and the CO2 separation ratio reached 14.30%. The CO2 molar concentration in the remaining gas phase (xCO2gas) was lowest at 271.2 K in the type-B zeolite system with a water content of 47.62%. Raman analysis revealed that CO2 preferentially occupied the small hydrate cages and there was a competitive relationship between N2 and CO2.

OS5-7 Gas Separation of Mixed Gases by Hydrate Formation after Steam Reforming

2007 ◽  
Vol 2007.12 (0) ◽  
pp. 275-276
Author(s):  
Hiroaki MURAKAMI ◽  
Ryo NOZAWA ◽  
Kazuhiko MURAKAMI ◽  
Hajime ENDOU ◽  
Masahiro OTA
Keyword(s):  
Gas Separation ◽  
Steam Reforming ◽  
Hydrate Formation ◽  
Mixed Gases

Gas Separation of Mixed Gases by Hydrate Formation

2004 ◽  
Vol 2004.9 (0) ◽  
pp. 345-346
Author(s):  
Yoshrnori HASHIMOTO ◽  
Hiroyuki NISHIMOTO ◽  
Masahiro OTA
Keyword(s):  
Gas Separation ◽  
Hydrate Formation ◽  
Mixed Gases

A Preliminary Study for Proposal of Low-Energy and Environmental Load-Reducing Building Technology through Analysis of Domestic and International Green Standard for Energy & Environmental Design

2017 ◽  
Vol 864 ◽  
pp. 351-356
Author(s):  
Tae Hyoung Kim ◽  
Chang U Chae ◽  
Yu Jin Kim ◽  
Su Hyun Jo ◽  
Sang Hee Kim
Keyword(s):  
Greenhouse Gas ◽  
Green Building ◽  
Environment Friendly ◽  
Building Technology ◽  
Greenhouse Gas Reduction ◽  
International Environment ◽  
Ghg Reduction ◽  
Preliminary Study ◽  
The Republic ◽  
Technology Group

The purpose of this study is to construct of database for greenhouse gas (GHG) emission reduction technologies through the analysis of domestic and foreign green building certifications, as part of inventory study of greenhouse gas reduction technologies. For this purpose, analyzing G-SEED, LEED, BREEAM, CASBEE cert3ifications, derived the three categories associated with GHG reduction technologies and investigated the technologies related to standards of the three categories. As a result, commercially available GHG reduction domestic technologies database was constructed based on GHG reduction technology groups. After analyzing domestic and international environment-friendly building certifications (G-SEED, LEED, BREEAM, CASBEE), three categories (ecological environment, materials & resources, energy) associated with GHG reduction technology were derived. The certification standards by category and GHG reduction technologies were analyzed, and GHG reduction technology group was classified. Based on the list of the classified GHG reduction technologies, GHG reduction technologies commercialized in the Republic of Korea were kept as database.

scholarly journals Study on Mass Transfer Characteristics of Hydrate-based Gas Absorber

2021 ◽  
Vol 333 ◽  
pp. 04002
Author(s):  
Shun Takano ◽  
Ryosuke Ezure ◽  
Yusuke Takahashi ◽  
Hiroyuki Komatsu ◽  
Kazuaki Yamagiwa ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Separation ◽  
Bubble Column ◽  
Hydrate Formation ◽  
Continuous Operation ◽  
Gas Absorption ◽  
Volumetric Mass Transfer Coefficient ◽  
Type Apparatus

Hydrated-based gas separation is a method capable of selectively separating and recovering greenhouse gases. Although a conventional hydrate-based gas separation apparatus is a batch or a semi-batch system, continuous operation is preferable to increase the throughput of gas without changing the apparatus volume. Recently, we proposed a flow type apparatus to allow continuous operation of hydrate formation (absorption) and subsequent decomposition (desorption). The aim of this study is to investigate the mass transfer characteristics of the continuous apparatus using the HFC134a-N2 mixed gas system. The volumetric mass transfer coefficient was calculated especially during a steady state of gas absorption. Besides, we compared mass transfer performance between the hydrate-based gas absorber and a conventional bubble column. Sodium dodecyl sulfate was used as a hydrate dispersant. In the flow type apparatus, the gas-liquid contact was good and the hydrate slurry state was observed during hydrate formation. In the surfactant solution, the volumetric mass transfer coefficient increased in comparison with that in water. The volumetric mass transfer coefficient with hydrate was higher than that of the bubble column. These results suggest that hydrate formation improves gas absorption performance.

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