Separation of CO2 using ultra-thin multi-layer polymeric membranes for compartmentalized fiber optic sensor applications

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dc.contributor.authorDavies, Benjamin
dc.contributor.supervisorWild, Peter Martin
dc.contributor.supervisorFyles, Thomas M.
dc.date.accessioned2014-03-20T22:37:45Z
dc.date.available2014-03-20T22:37:45Z
dc.date.copyright2014en_US
dc.date.issued2014-03-20
dc.degree.departmentDepartment of Mechanical Engineering
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractCarbon dioxide sequestration is one of many mitigation tools available to help reduce carbon dioxide emissions while other disposal/repurposing methods are being investigated. Geologic sequestration is the most stable option for long-term storage of carbon dioxide (CO2), with significant CO2 trapping occurring through mineralization within the first 20-50 years. A fiber optic based monitoring system has been proposed to provide real time concentrations of CO2 at various points throughout the geologic formation. The proposed sensor is sensitive to the refractive index (RI) of substances in direct contact with the sensing component. As RI is a measurement of light propagating through a bulk medium relative to light propagating through a vacuum, the extraction of the effects of any specific component of that medium to the RI remains very difficult. Therefore, a requirement for a selective barrier to be able to prevent confounding substances from being in contact with the sensor and specifically isolate CO2 is necessary. As such a method to evaluate the performance of the selective element of the sensor was investigated. Polybenzimidazole (PBI) and VTEC polyimide (PI) 1388 are high performance polymers with good selectivity for CO2 used in high temperature gas separations. These polymers were spin coated onto a glass substrate and cured to form ultra-thin (>10 μm) membranes for gas separation. At a range of pressures (0.14 –0.41 MPa) and a set temperature of 24.2±0.8 °C, intrinsic permeabilities to CO2 and nitrogen (N2) were investigated as they are the gases of highest prevalence in underground aquifers. Preliminary RI testing for proof of concept has yielded promising results when the sensor is exposed exclusively to CO2 or N2. However, the use of both PBI and VTEC PI in these trials resulted in CO2 selectivities of 0.72 to 0.87 and 0.33 to 0.63 respectively, for corresponding feed pressures of 0.14 to 0.41 MPa. This indicates that both of the polymers are more selective for N2 and should not be used in CO2 sensing applications as confounding gas permeants, specifically N2, will interfere with the sensing element.en_US
dc.description.proquestcode0428en_US
dc.description.proquestcode0495en_US
dc.description.proquestcode0542en_US
dc.description.proquestemailben.t.davies@gmail.comen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/5207
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectOptode
dc.subjectCaulked Membrane
dc.subjectCO2 Sensing
dc.subjectCO2 Separation
dc.subjectCO2 Sequeatration Monitoring
dc.subjectCO2 Sequestration
dc.subjectDownhole Monitoring
dc.subjectFiber Optic Sensor
dc.subjectGas Separation
dc.subjectGas Separation Theory
dc.subjectLong Period Fiber Grating (LPFG)
dc.subjectLong Period Grating (LPG)
dc.subjectMembrane
dc.subjectPolybenzimidazole (PBI)
dc.subjectPolymeric
dc.subjectVTEC polyimide (PI) 1388
dc.subjectInstitute for Integrated Energy Systems (IESVic)
dc.titleSeparation of CO2 using ultra-thin multi-layer polymeric membranes for compartmentalized fiber optic sensor applicationsen_US
dc.typeThesisen_US

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