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

Autor(es)

Sanches de Menezes, Davi Eber ^[1] ; Sum, Amadeu K. ^[2] ; Desmedt, Arnaud ^[3] ; Pessoa Filho, Pedro de Alcantara ^[1] ; Robustillo Fuentes, Maria Dolores ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Chemical Engineering Science; v. 208, NOV 23 2019.
• Citações Web of Science: 3

Resumo

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)

• Processo FAPESP: 14/25740-0 - Estudo da formação e dissociação de hidratos de gás em altas pressões
• Beneficiário: Maria Dolores Robustillo Fuentes
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 15/23148-9 - Estudo termodinâmico da formação e dissociação de hidratos de gás
• Beneficiário: Davi Éber Sanches de Menezes
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 14/02140-7 - Estudo da formação e dissociação de hidratos de gás
• Beneficiário: Maria Dolores Robustillo Fuentes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 17/01351-2 - Estudo estrutural de hidratos de gás a elevadas pressões
• Beneficiário: Davi Éber Sanches de Menezes
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto