Investigation of MEA degradation in presence of SOx and NOx species in CO2 Capture systems

Abstract

The degradation of Monoethanolamine (MEA) in CO2 capture systems when exposed to sulphur oxides (SOx) and nitrogen oxides (NOx) species is a crucial challenge that demands investigation. This scientific paper delves into the degradation mechanisms arising from the interaction of MEA with SOx and NOx species, leading to the formation of degradation compounds like Nitrosamines and Nitramines in the presence of NOx, and heat stable salts in the case of SOx degradation. To establish a comprehensive foundation, an ideal CO2 capture system was initially studied, assuming no degradation. This approach provided a baseline understanding, facilitating comparisons with real-world scenarios. Subsequently, a wide range of insights, information, and data were gathered from various credible literary sources. This extensive literature review enriched the study's knowledge base and paved the way for a more profound investigation. This study addressed the degradation of MEA in the presence of SOx species. Based on experimental data, a novel kinetic model was proposed, which offered valuable insights into the formation of heat stable salts and other degradation compounds. These findings allowed for a comprehensive understanding of the complex interactions occurring in the presence of SOx. Additionally, to gain deeper insights into the degradation process due to NOx species, a kinetic model was developed using Aspen V14 software. The utilization of Visual Studio 2022 and Intel Fortran Compiler 2023 facilitated the integration of the respective kinetic model. Through this modelling approach, the formation of Nitrosamines and Nitramines can be elucidated, shedding light on the underlying kinetics and mechanisms. The results obtained from these investigations provide valuable knowledge about the degradation processes of MEA in carbon capture systems. Understanding these degradation mechanisms is pivotal for enhancing the efficiency and effectiveness of CO2 capture systems. By identifying and mitigating the formation of harmful degradation compounds, such as Nitrosamines, Nitramines, and heat stable salts, the reliability and sustainability of carbon capture technologies can be significantly improved. This study serves as a steppingstone towards a more profound exploration of degradation mechanisms in carbon capture systems. As future research progresses, it holds the potential to unlock novel strategies for tackling degradation-related challenges. Ultimately, this scientific endeavour contributes to the global pursuit of sustainable carbon capture, addressing environmental concerns and supporting the transition to a greener and more sustainable future.