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Title: Composite ionic liquid and polymer membranes for reactive separation at elevated temperature
Author: Liang , Lizhe
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2013
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This thesis studies composite ionic liquid and polymer membranes (CILPMs} for gas separation and reactive separation membranes (RSMs) for reactive separation at elevated temperature. The aim of this investigation is to develop feasible CILPMs and RSM s, and optimize operating conditions to achieve high permeability and selectivity for gas separation. ClLPMs are composed of ionic liquids for facilitating gases through membranes and polymers as support. Ionic liquids: [C4mim][NTh], [C4mim j[PF6] , [C4mim][FAP] and polymers: PMDA-ODA PI, PBI were used to fabricate CILPMs in this project. A measurement rig was designed and built to measure permeabilities and selectivities of the CILPMs for H2, N2, CO, CO2 and CH4 at various pressures and temperatures. According to the results, gas permeability and selectivity of Cl l PMs were rarely changed with the pressure but greatly affected by the temperature. Normally, permeability increased and selectivity decreased with the rising of the temperature. The presence of ionic liquid in CILPMs had positive effect on CO2 permeation through the membranes, and therefore improved CO2 separation performance. However, H2 separation performance of the membranes was reduced by ionic liquids. RSMs combine the reaction and the separation in the membrane processes. In this project, RSMs were composed of CILPMs with dissolved catalysts for gas reaction. Ruthenium complexes were chosen as the catalyst for water gas shift reaction which transfers CO into H2 . The aim of reactive separation was increasing HJCO selectivity of the membranes and reducing the CO concentration in H2 stream to a very low level. A measurement rig for testing reactive separation was designed and built. According to the results, the water gas shift reaction occurred in RSMs increased the HJCO selectivity significantly under optimized conditions. A mathematical model was developed to simulate the reactive separation process and explain the results. CILPMs and RSMs showed improvements for gas separation and more research is required for optimizing these membranes.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available