Síntese, caracterização e avaliação de novos líquidos iônicos e poli(líquidos iônicos) para uso em captura de CO2

Abstract

Commercial processes to capture CO2, are mostly, are based on chemical absorption by amine solutions, though this technique promotes the efficient CO2 separation this has disadvantages such as loss of volatile amines and their degradation. Alternatives have been studied for carbon capture and ionic liquids (RTILs) and poly (ionic liquids) - p(IL)s, are indicated in the literature as materials with a capacity to solubilize gases. In these studies CO2 shows has a high solubility in comparison to other gases, proving to be an alternative to carbon capture techniques already used industrially, in order to mitigate environmental impacts. This work aims to synthesize and characterize new poly(ionic liquid)s, and verify the CO2 solubility in these products, compared with modified RTILs and p(IL)s already presented in the literature. The p(IL)s synthesis were based on polyurethanes, because they present structures highly nitrogenous. The synthesized materials were characterized according to its structure, composition, thermal stability, and morphology by techniques such as FTIR, 1H-NMR, TGA, DSC, GPC and SEM. The CO2 solubility measurements were determined using a thermogravimetric microbalance high pressure (PTGA) at 25 ° C, as well as in a equilibrium cell for verifying the integrity of samples during the tests of solubility. In This study was observed better absorption capacity of the p(LI)s compared to the RTILs, demonstrating to be compatible with the literature, and the PUA-02a presented the best results, promising ones for use in CO2 capture.