Design of Ecological CO2 Enrichment System for Greenhouse Production using TBAB + CO2 Semi-Clathrate Hydrate

Takeya, Satoshi; Muromachi, Sanehiro; Maekawa, Tatsuo; Yamamoto, Yoshitaka; Mimachi, Hiroko; Kinoshita, Takahiro; Murayama, Tetsuo; Umeda, Hiroki; Ahn, Dong-Hyuk; Iwasaki, Yasunaga; Hashimoto, Hidenori; Yamaguchi, Tsutomu; Okaya, Katsunori; Matsuo, Seiji

doi:10.3390/en10070927

Cited by 21 publications

(13 citation statements)

References 54 publications

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“…Although comparable CO 2 mole fractions in the TBAB, TBPB and TBPC hydrates were obtained, the TBAB hydrates had irregularly better CO 2 selectivity at 1 MPa. This result showed an additional advantage of TBAB hydrates for the gas separation process operated at low pressures 6 , 7 . The TBPB and TBPC hydrates showed slightly lower CO 2 mole fractions in the hydrate phase.…”

Section: Resultsmentioning

confidence: 70%

“…CO 2 capture technologies in industry are necessary to be developed to reduce the vast CO 2 emission 1 – 3 . Gas separation by ionic clathrate hydrates is promising due to their unique gas selectivity and low operation pressure 4 – 7 . As well as gas hydrates which are widely known for natural methane hydrates ionic clathrate hydrates are also investigated for their applications such as cold energy storage 8 – 11 , gas storage 12 – 15 and gas separation 4 , 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

“…Since CO 2 is suitably incorporated in the ionic clathrate hydrates 28 , 29 , CO 2 capture processes based on ionic clathrate hydrates were proposed 4 , 7 , 16 , 30 – 37 . CO 2 capture from flue gas by ionic clathrate hydrates were reported a lot 4 , 6 , 32 – 37 .…”

Section: Introductionmentioning

confidence: 99%

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Structure-driven CO2 selectivity and gas capacity of ionic clathrate hydrates

Hashimoto

Yamaguchi

Ozeki

et al. 2017

Sci Rep

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Ionic clathrate hydrates can selectively capture small gas molecules such as CO2, N2, CH4 and H2. We investigated CO2 + N2 mixed gas separation properties of ionic clathrate hydrates formed with tetra-n-butylammonium bromide (TBAB), tetra-n-butylammonium chloride (TBAC), tetra-n-butylphosphonium bromide (TBPB) and tetra-n-butylphosphonium chloride (TBPC). The results showed that CO2 selectivity of TBAC hydrates was remarkably higher than those of the other hydrates despite less gas capacity of TBAC hydrates. The TBAB hydrates also showed irregularly high CO2 selectivity at a low pressure. X-ray diffraction and Raman spectroscopic analyses clarified that TBAC stably formed the tetragonal hydrate structure, and TBPB and TBPC formed the orthorhombic hydrate structure. The TBAB hydrates showed polymorphic phases which may consist of the both orthorhombic and tetragonal hydrate structures. These results showed that the tetragonal hydrate captured CO2 more efficiently than the orthorhombic hydrate, while the orthorhombic hydrate has the largest gas capacity among the basic four structures of ionic clathrate hydrates. The present study suggests new potential for improving gas capacity and selectivity of ionic clathrate hydrates by choosing suitable ionic guest substances for guest gas components.

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Section: Resultsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Structure-driven CO2 selectivity and gas capacity of ionic clathrate hydrates

Hashimoto

Yamaguchi

Ozeki

et al. 2017

Sci Rep

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“…Gas hydrate, also called a water clathrate compound, is a hydrogen-bonded cage-like structure of water molecules in which molecules of other substances enter [40,41]. This substance has the characteristic of being produced under high pressure, as typified by methane (CH 4 ) hydrate and CO 2 hydrate [42,43]. Here, we examined a case study of transporting CO 2 and CO 2 hydrate supplied from an industrial area to an agricultural area and using them in agriculture.…”

Section: Outline Of the Target Areamentioning

confidence: 99%

Proposal of Agro-Industrial Integration Heat Transport System Using High-Performance Medium for the Realization of a Sustainable Society

2022

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The aim of this study is to propose an agro-industrial heat transport system from industrial to agricultural areas for horticultural facilities with high heat demand to fill the problematic gap in the current heat transport system, and to derive by simulation the conditions under which this system can be used economically as well as environmentally. In this study, HASClay was used as a high-performance medium. HASClay has the ability to supply carbon dioxide (CO2) at the same time as heat and dehumidify the inside of the house, so it can be expected to increase the yield in addition to reducing the environmental load by using heat. The simulation results show that the proposed system of supplying heat to a large greenhouse in HASClay in 20-ton containers would have an economic budget similar to that of the previous system, but with an environmental impact of about 80% less tomatoes and 84% less chrysanthemum fuel than the previous system of heating with fuel oil. On the other hand, the analysis showed that the power of the fan could be reduced as an improvement of the heat transport problem using HASClay. As a countermeasure, the use of natural energy and the change of the fan for heat supply from a damper system to an inverter system to control the air volume were considered. For transport to the 10a scale, which has environmental advantages, a system was proposed in which the heat from the HASClay is divided into mini-tanks and transported to stations envisaged in each region, where it is collected by the agricultural producers. In summary, the authors concluded that our proposal for an agro-industrial fusion system based on the transport of heat using HASClay is an effective method for the realization of a sustainable society. The environmental benefits of the project are likely to attract participation from the industrial sphere in order to meet future demands for CO2 reductions.

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“…In many research reports on HBGS, thermodynamic promoters such as THF, propane, or quaternary ammonium salts were used to moderate the harsh conditions for hydrate formation. As well, kinetic promoters such as sodium dodecyl sulfate were used to accelerate the kinetics of hydrate formation. − ,− The degree of guest selectivity of clathrate hydrates for mixed gases is controlled by the inherent properties of the guest molecules such as thermodynamic stability of the hydrate, the cage occupancy, and structural preference. Most HBGS studies have reported improved selectivity of carbon dioxide by controlling hydrate formation conditions (i.e., operating pressure and temperature) or the concentration of promoting additives that occupy the large cages of hydrates. − No attempt has been made to add another small guest molecule capable of competing with small gaseous molecules such as hydrogen (from syngas) or nitrogen (from flue gas) in the occupancy of dodecahedral 5 12 cages, consequently improving carbon dioxide selectivity.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Ammonium Fluoride and Methanol in Carbon Dioxide Clathrate Hydrates and Their Significance for Hydrate-Based Gas Separation

Kim

Lee

Shin

et al. 2021

Ind. Eng. Chem. Res.

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Methanol is known as one of few small molecules that cannot stabilize a solid clathrate hydrate host lattice as a guest molecule in a simple hydrate phase. Recently, it was discovered that water−NH 4 F solutions can form clathrates consisting of solid solutions of water and NH 4 F, which have the same structure as the canonical clathrate hydrates. These doped phases were found to be able to incorporate strongly hydrophilic guests such as methanol. As the next step in testing the utility of these novel hydrates, we prepared NH 4 F-doped clathrates with simple CO 2 and binary CO 2 + methanol guest molecules and characterized these by powder X-ray diffraction (PXRD), Raman spectroscopy, and molecular dynamics (MD) simulations. From the PXRD analysis, it was confirmed that CO 2 interacts more strongly with the NH 4 F-doped 5 12 cages than the 5 12 cages without dopants. The MD simulations supported the PXRD results by demonstrating a strong interaction between the O atom of CO 2 and the dopant NH 4 + in the small cages. The incorporation of methanol into the CO 2 + methanol clathrates was confirmed by PXRD analysis. With low concentrations of methanol, this guest shows a preference for the 5 12 cages and may serve as a site blocker for the 5 12 cage that normally would be occupied by small molecules such as CH 4 and N 2 in hydrate-based gas separation (HGBS) processes. Phase boundary conditions for hydrate stability in CO 2 −NH 4 F−CH 3 OH− water were obtained, and it was determined that a solution of 5 mol % NH 4 F and 2.2 mol % CH 3 OH is a reasonable choice for operating an HBGS process. The present findings provide insight into the potential of the NH 4 F-doped hydrate lattice, aided by quantities of catalytic methanol, for use in HBGS processes.

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Design of Ecological CO2 Enrichment System for Greenhouse Production using TBAB + CO2 Semi-Clathrate Hydrate

Cited by 21 publications

References 54 publications

Structure-driven CO2 selectivity and gas capacity of ionic clathrate hydrates

Structure-driven CO2 selectivity and gas capacity of ionic clathrate hydrates

Proposal of Agro-Industrial Integration Heat Transport System Using High-Performance Medium for the Realization of a Sustainable Society

Incorporation of Ammonium Fluoride and Methanol in Carbon Dioxide Clathrate Hydrates and Their Significance for Hydrate-Based Gas Separation

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