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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Coexistence of sI and sII in methane-propane hydrate former systems at high pressures

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Author(s):
Sanches de Menezes, Davi Eber [1] ; Sum, Amadeu K. [2] ; Desmedt, Arnaud [3] ; Pessoa Filho, Pedro de Alcantara [1] ; Robustillo Fuentes, Maria Dolores [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Engn Sch, Dept Chem Engn, Caixa Postal 61548, BR-05424970 Sao Paulo, SP - Brazil
[2] Colorado Sch Mines, Chem & Biol Engn Dept, Phases Flow Lab, Golden, CO 80401 - USA
[3] Univ Bordeaux, CNRS, UMR5255, Grp Spectroscopie Mol, Inst Sci Mol, Bordeaux - France
Total Affiliations: 3
Document type: Journal article
Source: Chemical Engineering Science; v. 208, NOV 23 2019.
Web of Science Citations: 3
Abstract

The hydrate-former system composed of methane-propane-water was studied through HP-mu DSC and a PVT cell. New equilibrium data were obtained. Results reveal evidence of the simultaneous formation of structures I and II, although only sII is expected at such conditions at equilibrium. Most of sI is present as a metastable structure, but a small fraction of it seems to provide a more stable system, mainly at excess methane conditions. The effect of heating rate, mixing, multiple cycles and initial gas phase composition on the formation of both structures was evaluated. These factors affect the formation kinetics, the type and the proportion of each hydrate structure and hence the thermodynamic profile during dissociation. Raman spectroscopy was applied for studying ex situ single and double hydrates, suggesting a higher fraction of sII than sI for all gas phase compositions studied, and higher occupancy of large cavities by methane molecules as methane content increases. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 14/25740-0 - Study on the formation and dissociation of gas hydrates at high pressure
Grantee:Maria Dolores Robustillo Fuentes
Support type: Scholarships in Brazil - Young Researchers
FAPESP's process: 17/01351-2 - Structural study of gas hydrates at high pressures
Grantee:Davi Éber Sanches de Menezes
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 15/23148-9 - Thermodynamic study on gas hydrate formation and dissociation
Grantee:Davi Éber Sanches de Menezes
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 14/02140-7 - Study on the formation and dissociation of gas hydrates
Grantee:Maria Dolores Robustillo Fuentes
Support type: Research Grants - Young Investigators Grants