Optimization of sterically hindered polyallylamine (SHPAA) based coatings in hollow fiber membrane for post-combustion CO2 capture

In recent years, due to the unprecedented increase of carbon dioxide concentration in the atmosphere, a lot of attention has been attracted to the carbon capture processes, and much research is still going on to find the most economically feasible solution for this global challenge. Membrane gas separation processes have promising advantages compared to traditional processes. In this regard, hollow fiber membranes, due to their high packing density and ease of fabrication, have a specific position in the development of carbon capture processes. Sterically Hindered Polyallylamine (SHPAA) is one of the amine-based polymers that has been widely used as a selective layer in polymeric membranes and has shown impressive separation efficiency. In this project, some of the effective parameters during the synthesis of sterically hindered polyallylamine as a coating of hollow fiber membranes were investigated. This study was performed for the CO2/N2 separation. Moreover, the effect of introducing Potassium L-Proline (ProK) as a mobile carrier and polyvinyl alcohol (PVA) as a surface modifier was studied for some specific concentrations. The best results were used for the preparation of a high-density membrane module. It was found that decreasing reaction temperature during the synthesis of sterically hindered poly(allylamine) can increase membrane permeance up to 550 GPU. Unfortunately, a clear trend in membrane separation properties was not found when the mobile carrier and surface modifier were added to the coating solution, and the results fluctuated. Further study is needed to identify the effectiveness of the selected mobile carrier.