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Andersson O, Saiduzzaman M, Brant Carvalho PHB, Häussermann U. Amorphous-like thermal conductivity and high mechanical stability of cyclopentane clathrate hydrate. Phys Chem Chem Phys 2024; 26:16017-16025. [PMID: 38775259 DOI: 10.1039/d4cp01656d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
The thermal conductivity κ of cyclopentane clathrate hydrate (CP CH) of type II was measured at temperatures down to 100 K and at pressures up to 1.3 GPa. The results show that CP CH displays amorphous-like κ characteristic of many crystalline clathrate hydrates, e.g., tetrahydrofuran (THF) CH. The magnitude of κ is 0.47 W m-1 K-1 near the melting point of 280 K at atmospheric pressure, and it is almost independent of pressure and temperature T: ln κ = -0.621-40.1/T at atmospheric pressure (in SI-units). This is slightly less than κ of type II CHs of water-miscible solvents such as THF. Intriguingly, unlike other water-rich type II clathrate hydrates of water-miscible molecules M (M·17 H2O), CP CH does not amorphize at pressures up to 1.3 GPa at 130 K and also remains stable up to 0.5 GPa at 240 K. This shows that CP CH is mechanically more stable than the previously studied water-rich type II CHs, and suggests that repulsive forces between CP and the H2O cages increase the mechanical stability of crystalline CP CH. Moreover, we show that κ of an ice-CH mixture, which often arises for CHs that form naturally, is described by the average of the parallel and series heat conduction models to within 5% for ice contents up to 22 wt%. The findings provide a better understanding of the thermal and stability properties of clathrate hydrates for their applications such as gas storage compounds.
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Affiliation(s)
- Ove Andersson
- Department of Physics, Umeå University, 901 87 Umeå, Sweden.
| | - Md Saiduzzaman
- Department of Physics, Umeå University, 901 87 Umeå, Sweden.
| | | | - Ulrich Häussermann
- Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
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Masoudi A, Jafari P, Nazari M, Kashyap V, Eslami B, Irajizad P, Ghasemi H. An in situ method on kinetics of gas hydrates. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:035111. [PMID: 30927797 DOI: 10.1063/1.5082333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/02/2019] [Indexed: 06/09/2023]
Abstract
Gas hydrate formation is a high-risk and common flow assurance problem in subsea oil production plants. The modern strategies to mitigate hydrate formation have switched from thermodynamic inhibition to risk management. In this new mitigation strategy, hydrate formation is allowed as long as it does not lead to plugging of pipelines. Thus, understanding the growth kinetics of gas hydrates plays a critical role in risk management strategies. Here, we report a new accurate and in situ approach to probe the kinetics of gas hydrate formation. This approach is based on the hot-wire method, which probes the thermal properties of the medium surrounding the hot-wire. As the thermal properties of gas hydrate and its initial constituents are different, variation in these properties is used to probe kinetics of hydrate growth front. Through this in situ method, we determine kinetics of cyclopentane hydrate formation in both mixing and flow conditions. The findings show that at ambient pressure and a temperature of 1-2 °C, the hydrate formation rate under mixing condition varies between 1.9 × 10-5 and 3.9 × 10-5 kg m-2 s-1, while in flow condition, this growth rate drops to 4.5 × 10-6 kg m-2 s-1. To our knowledge, this is the first reported growth rate of cyclopentane hydrate. This in situ approach allows us to probe kinetics of hydrate formation where there is no optical access and provides a tool to rationally design risk management strategies for subsea infrastructures.
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Affiliation(s)
- Ali Masoudi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Parham Jafari
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Masoumeh Nazari
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Varun Kashyap
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Bahareh Eslami
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Peyman Irajizad
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
| | - Hadi Ghasemi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA
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Tkachev SN, Pravica M, Kim E, Weck PF. Raman spectroscopic study of cyclopentane at high pressure. J Chem Phys 2009; 130:204505. [DOI: 10.1063/1.3137075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Andersson P, Ross R. Thermal resistivity, heat capacity and phase diagram of CBr4under pressure. Mol Phys 2006. [DOI: 10.1080/00268978000101121] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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van Loef J. Transport properties of compressed atomic and molecular liquids, and solids and the molar volume. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0378-4363(81)90120-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ross R, Andersson P, Bäckström G. Thermal conductivity and heat capacity of solid phases of benzene under pressure. Mol Phys 1979. [DOI: 10.1080/00268977900101741] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ross R, Andersson P, Bäckström G. Thermal conductivity and heat capacity of benzene, naphthalene and anthracene under pressure. Mol Phys 1979. [DOI: 10.1080/00268977900101851] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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