CO2 capture pilot campaign: Understanding solvent degradation of CESAR1 in cement plant operations

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL Chemical Engineering Journal Pub Date : 2025-03-15 DOI:10.1016/j.cej.2025.161542
Randi Neerup, Kalle L. Øbro, Isaac A. Løge, Nomiki Kottaki, Carsten F. Frøstrup, Istvan Gyorbiro, Maria Dimitriadi, Halil Halilov, Søren Jensen, Jakob L. Karlsson, Philip L. Fosbøl
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Abstract

CESAR1 is regarded as the new benchmark solvent for amine-based CO2 capture, yet limited data exists on its degradation using flue gas with a CO2 concentration of 18 vol%. This study evaluated CESAR1 degradation over 3900 h using a pilot plant capturing 1 ton of CO2 per day from Aalborg Portland cement plant flue gas. In this work, the CESAR1 was composed of 26 wt% 2-amino-2-methyl-1-propanol and 6 wt% piperazine to avoid precipitation in the pilot.Solvent degradation was evident as the solvent color shifted from clear to orange, indicating the formation of degradation products such as heat-stable salts (HSS) and possibly iron. Analyses identified byproducts like glycolic acid, formate, acetate, and oxalate. Glycolic acid stabilized after initial accumulation, while oxalate continued to increase, suggesting it as a final degradation product.Flue gas impurities contributed to the accumulation of anions like nitrate, nitrite, sulfate, and phosphate. Nitrate increased significantly due to high NOx levels, with nitrite largely oxidized to nitrate. Sulfate levels, initially low, rose over time, while phosphate concentrations remained minor but gradually increased.Cations such as calcium, iron, sodium, ammonium, and magnesium were also tracked. Calcium, due to low solubility, was not detected, and iron and magnesium trends were unclear, likely due to precipitation. Sodium and ammonium varied with flue gas composition and operations. Overall, cation build-up was less pronounced than that of anions.These findings offer valuable insights into CESAR1 degradation and impurity dynamics, aiding plant operators in maintaining solvent health. Understanding flue gas impurities can help identify and remove harmful components pre-capture, accelerating full-scale implementation of carbon capture technology in cement production. It is the first time CESAR1 has been tested on flue gas originating from cement production.
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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