Greenhouse Gas Control Technologies 7

Greenhouse Gas Control Technologies 7

Proceedings of the 7th International Conference on Greenhouse Gas Control Technologies 5– September 2004, Vancouver, Canada
Volume II - Part2, 2005, Pages 1883-1886
Greenhouse Gas Control Technologies 7

- Thermal dependence of carbon dioxide transport through a dense polymeric membrane

https://doi.org/10.1016/B978-008044704-9/50233-0Get rights and content

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Polymeric gas separation membranes are currently used commercially for CO2/CH4 separation in a number of operations worldwide. However, a major technical hurdle associated with such membranes is the plasticization of the membrane with increasing concentrations of polar gases such as CO2. Significant research efforts are being conducted into characterizing and avoiding the plasticization phenomena. This chapter presents a study that investigates the permeability of polyimide membranes formed from a readily available commercial membrane Matrimid 5218 in carbon dioxide at temperatures up to 100°C and pressures up to 2500kPa. In this study, membranes were tested in both as cast and thermally annealed formats. The effect of thermal annealing on plasticization has also been examined. Thermal annealing was found to suppress plasticization of the membranes in this temperature and pressure range. It was shown that some degree of crosslinking occurred during annealing, leading to a reduction of carbon dioxide permeabilities by a factor of 2–3.

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