Título: | KINETICS OF CYCLOPENTANE HYDRATE FORMATION: AN INTERFACIAL RHEOLOGY STUDY | ||||||||||||
Autor: |
BRUNA COSTA LEOPERCIO |
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Colaborador(es): |
PAULO ROBERTO DE SOUZA MENDES - Orientador GERALD G FULLER - Coorientador |
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Catalogação: | 23/FEV/2017 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=29255&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=29255&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.29255 | ||||||||||||
Resumo: | |||||||||||||
Hydrate formation and dissociation processes are of major interest in environmental
and energy fields. Specifically for the oil and gas industry, hydrate
appears as an issue regarding flow assurance, pushing even more the urgent need
for expanding the knowledge on hydrate phenomena. In the current work, a
new approach to observe and understand the kinetics and mechanical properties
of hydrates by interfacial rheology is presented. The standard du Nouy ring
is employed with a novel brass cell designed to permit the necessary temperature
management. Cyclopentane is used as hydrate former. With the new interfacial
geometry, different temperature and water/cyclopentane contact protocols are explored.
The importance of first contacting CP against ice crystals in order to initiate
hydrate formation is of particular interest. Thus, time sweeps are performed
in two stages: one for ice formation and another for hydrate formation. It was
determined that cyclopentane hydrates only arise at temperatures Tf less than or equal to 6 celsius degree. A
worthwhile discussion regarding the hydrate metastability state is then presented.
After hydrates completely populate the water/cyclopentane interface, strain
sweeps of the interfacial elastic and viscous moduli (G and G) are conducted to
examine the fragility of the hydrate films. The mechanical properties of hydrate
films demonstrated high dependence on temperature (Tf): the induction time (tc),
measured from the moment when cyclopentane first contacts ice, as well as the
elastic modulus (G) and the yield strain (γy) increase as Tf is increased.
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