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應(yīng)廣東省可再生能源重點實驗室及中國科學(xué)院廣州能源研究所天然氣水合物研究中心的共同邀請，加拿大不列顛哥倫比亞大學(xué)(UBC)化學(xué)與生物工程系教授、加拿大工程院院士Peter Englezos教授將于2025年5月19日（周一）來訪并舉行學(xué)術(shù)報告會。報告會安排如下：

時間：2025年5月19日09:30-11:30

地點：節(jié)能與環(huán)保大樓10層報告廳

報告題目：Carbon capture and storage by clathrate hydrate crystallization- technology update

One area of application clathrate hydrate crystallization of tremendous interest is the separation of CO₂ form flue and fuel gas mixtures and the subsequent storage [1,?2]. Such mixtures arise in conventional fossil fuel power plants and in industrial gasification sites respectively. The key idea behind is the fact that when gas hydrate crystals are formed from a binary gas mixture such as CO₂/H₂ or? CO₂/N₂ at suitable pressure and temperature conditions the gas hydrate crystal phase is enriched with CO₂ and the remaining gas (“unreacted” gas) is enriched in H₂ or N₂ respectively. Another remarkable property of gas hydrates is the fact that the concentration of CO₂ in its hydrate state is 0.14 (mole fraction) whereas its solubility in water is 6.1 x 10^-4 (mole fraction). Thus,?the CO₂ uptake capacity of water in the hydrate state is orders of magnitude more than that in liquid state. Moreover, the hydrate process uses water and as such can be regarded as an environmental friendly method. Extensive research has focused on evaluating different hydrate crystallizer configurations and on identifying suitable chemicals which reduce the equilibrium hydrate formation pressure at a given temperature (“thermodynamic promoters”) [3]. Promoters include tetrahydrofuran (THF), and semi-clathrate formers such as tetra-n-butyl ammonium bromide (TBAB). Based on reported lab work, CO₂ can be enriched up to 90% in the hydrate phase from a fuel gas mixture consisting of 40% CO₂. The addition of promoters decreases the hydrate phase CO₂ composition. The extent of this decrease depends on the hydrate forming pressure temperature conditions, the type of hydrate crystallizer and the concentration of the promoter. Another important issue is heat transfer as hydrate formation is exothermic. The use of the hydrate process as part of a potential strategy to mitigate climate change in a carbon dependent economy is discussed. It is noted that capture of CO₂ (separation) represents the largest cost associated with carbon management,?which also includes pipeline transportation and injection of the CO₂. Clathrate hydrates are a novel way of capturing CO₂ and in this presentation we present a technology status update [4].?? ??

References

[1]?Li,?G.;?Englezos,?P.;?Sun,?D.;?Li,?X-S.;?Lv,?Q-N.;?Weng Y-F. Simulation of CO₂ hydrate formation in porous medium and comparison with laboratory trial data,?Energy,?310,?2024,?133224

[2]?Sharifi,?H.;?P. Englezos,?“A Dual Bed – Cyclic Gas Hydrate Process (DB-CGHP) for Carbon Dioxide Capture and Other Gas Separations”,?Energy and Fuels,?36(18),?10610-10617,?2022.

[3]?Englezos,?P.;?“Phase equilibrium in canonical cubic structure I (sI) and II (sII) and hexagonal (sH) gas hydrate solid solutions”,?Fluid Phase Equilibria,?578,?March 2024,?114005

[4]?Englezos,?P.;?“Technology Readiness Level of Gas Hydrate Technologies”,?Can J. Chem. Eng.,?101 (6),?3034-3043,?2023.

Brief Bio

Dr. Peter Englezos,?a professor in the Department of Chemical and Biological Engineering at the University of British Columbia (UBC) Vancouver campus,?with over 35 years of research experience in clathrate hydrates (crystalline water-based ice-like solids with water as a host to guest molecules such as carbon dioxide,?methane,?hydrogen and others that are trapped inside “cages” of hydrogen bonded water molecules). His research has contributed to applications such as carbon dioxide capture,?desalination, flow assurance in pipelines and understanding how the earth’s methane hydrates can contribute to climate change. He has also made important contributions in the fields of thermodynamics and optimization and co-authored a book,Applied Parameter Estimation for Chemical Engineers. He has mentored a number of scholars who are now research leaders in Canada and around the world. Dr. Englezos received several Honours including the RS Jane Memorial award, UBC Izaak Walton Killam Memorial Faculty Research Fellow, Fellow of the Tokyo Electric Power Company Chair at Keio University,?Fellow of the Engineering Institute of Canada and Fellow of the Canadian Academy of Engineering. He served two terms as Head of the Department (2009-2019) and currently serves in the University's Senate. Dr. Englezos serves as Associate Editor of the Chemical and Biological Engineering journal.?

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