Modeling post-combustion CO2 capture with amine solvents

Léonard, Grégoire; Heyen, Georges

doi:10.1016/b978-0-444-54298-4.50132-x

Cited by 11 publications

(6 citation statements)

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“…So far, the process energy penalty and the degradation of amine solvents have been studied separately and previously published models of the CO 2 capture process did not consider solvent degradation at all (e.g. Léonard and Heyen, 2011). Thus, the objective of the present work is to develop a model of the CO 2 capture process that assesses solvent degradation based on own experimental work, so that the influence of process operating conditions on solvent degradation may be better understood.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Léonard

Toye

Heyen

2014

Computer Aided Chemical Engineering

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Solvent degradation may be a major drawback for the large-scale implementation of post-combustion CO 2 capture due to amine consumption and emission of degradation products. However, its influence on the process operations has rarely been studied. In the present work, a kinetics model describing solvent oxidative and thermal degradation has been developed based on own experimental results for the benchmark solvent, i.e. 30 wt% monoethanolamine (MEA) in water. This model has been included into a global Aspen Plus model of the CO 2 capture process. The selected process modelling approaches are described in the present work. Using the resulting simulation model, optimal operating conditions can be identified to minimize both the energy requirement and the solvent degradation in the process. This kind of process model assessing solvent degradation may contribute to the design of large-scale CO 2 capture plants to consider not only the process energy penalty, but also its environmental penalty. Indeed, both aspects are relevant for the large-scale deployment of the CO 2 capture technology.

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Section: Introductionmentioning

confidence: 99%

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Léonard

Toye

Heyen

2014

Computer Aided Chemical Engineering

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“…This will lead to the development of a kinetic model of solvent degradation considering both oxidative and thermal degradation of MEA with CO 2 . This kinetic model of degradation will be included into a global model of the CO 2 capture process previously described, so that the results of the kinetic model can be validated against pilot plant data. The objective is then to develop a practical tool that will be able to predict the environmental impact of an industrial CO 2 capture process regarding solvent degradation.…”

Section: Resultsmentioning

confidence: 99%

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture

2014

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Solvent degradation represents one of the main operational drawbacks of the post-combustion CO 2 capture process. Degradation not only induces additional costs for solvent make-up, it also impacts the process efficiency and its environmental penalty due to the emission of various degradation products. There is still a gap of knowledge about the influence of process operating conditions on degradation, making it currently impossible to predict the solvent degradation rate in CO 2 capture plants. Morever, the reaction mechanisms corresponding to solvent degradation are very slow, significantly complicating its study in industrial units. In the present work, appropriate experimental equipment and analytical methods are developed for accelerating the degradation of monoethanolamine solvents (MEA). The relevance of accelerated conditions is established by comparing artificially degraded solvent samples with degraded solvent samples from industrial CO 2 capture pilot plants. Two approaches are evaluated implying either discontinuous or continuous gas feed, this latest being the most representative of industrial degradation. The respective influences of the gas feed composition and the gas-liquid transfer are evidenced and quantified. Finally, the present study leads to a better understanding of solvent degradation in the CO 2 capture process with MEA. More generally, it also evidences that accelerated conditions at laboratory-scale may provide relevant information for the study of slow phenomena taking place in large-scale industrial processes. Further works include the development of a kinetic model for MEA solvent degradation and the extension of this methodology to other promising solvents in order to facilitate the operation and large-scale deployment of CO 2 capture.

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“…In agreement with a preliminary study (Léonard and Heyen, 2011), the rate-based approach is used for modeling column mass transfers. Indeed, this approach is more adapted than the equilibrium one to describe the CO 2 capture process since the rate-based method rigorously calculates mass and heat transfers by solving the extended Maxwell-Stefan equations, which are much more accurate at describing column internal profiles.…”

Section: Model Descriptionmentioning

confidence: 92%

“…Several steps were necessary to achieve the final flowsheet represented in Fig. 2, some of them being described in Léonard and Heyen (2011) and in Léonard et al (2013Léonard et al ( , 2014c. This model represents the pilot plant described by Knudsen et al (2011), treating a flue gas flow rate of 5000 Nm 3 /h.…”

Section: Model Descriptionmentioning

confidence: 99%

Influence of process operating conditions on solvent thermal and oxidative degradation in post-combustion CO2 capture

Léonard

Crosset

Toye

et al. 2015

Computers & Chemical Engineering

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Monoethanolamine thermal and oxidative degradation Process modeling Plant design Integrated experimental and modeling study a b s t r a c tThe CO 2 post-combustion capture with amine solvents is modeled as a complex system interconnecting process energy consumption and solvent degradation and emission. Based on own experimental data, monoethanolamine degradation is included into a CO 2 capture process model. The influence of operating conditions on solvent loss is validated with pilot plant data from literature. Predicted solvent consumption rates are in better agreement with plant data than any previous work, and pathways are discussed to further refine the model. Oxidative degradation in the absorber is the largest cause of solvent loss while thermal degradation does not appear as a major concern. Using a single model, the process exergy requirement decreases by 10.8% and the solvent loss by 11.1% compared to our base case. As a result, this model provides a practical tool to simultaneously minimize the process energy requirement and the solvent consumption in post-combustion CO 2 capture plants with amine solvents.

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Modeling post-combustion CO2 capture with amine solvents

Cited by 11 publications

References 4 publications

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture

Influence of process operating conditions on solvent thermal and oxidative degradation in post-combustion CO2 capture

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Modeling post-combustion CO2 capture with amine solvents

Cited by 11 publications

References 4 publications

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO2 capture

Influence of process operating conditions on solvent thermal and oxidative degradation in post-combustion CO2 capture

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Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture