AbstractThis thesis evaluates the use of advanced porous materials for the preparation of membranes for CO2 removal application. Only a few membrane materials with limited performance are currently utilised, and new materials with superior performance are necessary to expand the membrane technology for this application. Superglassy polymers such as PIM-1 are a potential replacement for commercial membrane materials due to their high gas permeability and moderate CO2/CH4 selectivity. However, their initial excellent gas separation performance cannot be maintained over time due to physical ageing, and therefore their industrial implementation is hindered. The thesis is divided into two parts. The first part aims to overcome the physical ageing of PIM-1 by incorporating different fillers into self-standing membranes. Two-dimensional BNNS up to 2 wt % loading was introduced into PIM-1; by adding only 0.5 wt% of BNN to PIM-1, the ageing resistance was improved (reduction of permeability loss of 26%). On the other hand, the incorporation of 5 wt% modified UiO66 MOF with carboxylated PIM-1 (CPIM-UiO66) failed to slow down ageing. Although its long-term performance was not improved, CPIM-UiO66 led to better gas separation performance two-year after membrane preparation due to the enhancement of the CO2/CH4 selectivity. In the second part of this thesis, the potential of utilising superglassy membranes in the hybrid membrane/amine system to remove CO2 from natural gas is investigated by performing a comprehensive economic study. The study concluded that the feasibility of the hybrid membrane/amine system improved as compared to the amine stand-alone process when utilising a superglassy membrane with CO2 permeance of 200 GPU and a CO2/CH4 selectivity of 16.
|Date of Award
|31 Dec 2022
|Xiaolei Fan (Supervisor) & Patricia Gorgojo (Supervisor)
- CO2 removal