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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CESAR1 被认为是胺类二氧化碳捕集的新基准溶剂,但有关其在二氧化碳浓度为 18 Vol% 的烟道气中降解的数据却十分有限。本研究利用一个每天从奥尔堡波特兰水泥厂烟气中捕获 1 吨二氧化碳的试验工厂,对 CESAR1 的降解过程进行了 3900 小时的评估。在这项工作中,CESAR1 由 26 wt% 的 2-amino-2-methyl-1-propanol 和 6 wt% 的哌嗪组成,以避免在中试装置中发生沉淀。溶剂降解的明显表现是溶剂颜色从透明变为橙色,表明形成了降解产物,如热稳定盐(HSS),可能还有铁。分析发现了乙醇酸、甲酸盐、醋酸盐和草酸盐等副产品。乙醇酸在最初积累后趋于稳定,而草酸盐则继续增加,表明它是最终降解产物。烟道气杂质导致了硝酸盐、亚硝酸盐、硫酸盐和磷酸盐等阴离子的积累。由于氮氧化物含量较高,硝酸盐含量大幅增加,亚硝酸盐大部分被氧化成硝酸盐。硫酸盐的浓度最初较低,但随着时间的推移逐渐升高,而磷酸盐的浓度仍然较低,但逐渐升高。钙因溶解度低而未被检测到,铁和镁的变化趋势不明,可能是由于沉淀所致。钠和铵随烟气成分和运行情况而变化。总体而言,阳离子的积累不如阴离子明显。这些发现为了解 CESAR1 降解和杂质动态提供了宝贵的信息,有助于工厂操作人员保持溶剂健康。了解烟气杂质有助于识别和去除捕集前的有害成分,加快在水泥生产中全面实施碳捕集技术。这是首次对水泥生产过程中产生的烟气进行 CESAR1 测试。
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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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