Degradation of Amine Solvents in a CO2 Capture Plant at Lab-Scale: Experiments and Modeling,Industrial & Engineering Chemistry Research

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Degradation of Amine Solvents in a CO2 Capture Plant at Lab-Scale: Experiments and Modeling
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-04-18 , DOI: 10.1021/acs.iecr.7b05225
Serena Delgado ₁ , Benoît Valentin ₁ , Domitille Bontemps ₁ , Olivier Authier ₁

Affiliation

Carbon dioxide (CO₂) concentrations in the atmosphere have increased significantly over the past century. Many methods have been devised to reduce CO₂ industrial emissions, e.g., CO₂ postcombustion absorption by amine-based solvents. Solvent degradation losses are very critical in this process, due to economic and environmental issues. The two main degradation pathways of amine-based aqueous solutions in the presence of CO₂ are oxidative and thermal degradation. In this work, a lab-scale pilot plant has been set up to carry out degradation experiments during continuous and dynamic cycles of absorption and stripping with three different amine solvents: MEA (monoethanolamine) used as benchmark solvent for CO₂ capture, a blend of 1MPZ (1-methylpiperazine) and PZ (piperazine), and a blend of MDEA (methyldiethanolamine) and MEA. The experimental data have been used to assess the performance of CO₂ absorption over time and experimental conditions. The variation of CO₂ fraction at the gas outlet of the reactor has been used as an indicator of solvent degradation. To simulate the behavior of the plant at different experimental conditions and with each solvent, a dynamic model has been developed, on the basis of the validation of a fast reaction regime. It reproduces accurately the pilot plant’s behavior during the absorption and stripping phases. Among the solvents’ physical properties, the effect of viscosity appears to be the most critical for the CO₂ absorption efficiency. Kinetics of solvent degradation has finally been optimized to match experimental observations. Of the three solvents studied, 1MPZ/PZ is the most stable, whereas MEA and MDEA/MEA have quite similar degradation rates.

中文翻译：

实验室规模的CO ₂捕集装置中胺溶剂的降解：实验和建模

在过去的一个世纪中，大气中的二氧化碳（CO ₂）浓度显着增加。已经设计出许多方法来减少CO ₂工业排放，例如胺基溶剂对CO _2的燃烧后吸收。由于经济和环境问题，溶剂降解损失在此过程中非常关键。在CO ₂存在下，胺基水溶液的两个主要降解途径是氧化降解和热降解。在这项工作中，已经建立了实验室规模的中试装置，以便在吸收和汽提的连续和动态循环中使用三种不同的胺溶剂进行降解实验：MEA（单乙醇胺）用作CO _2的基准溶剂捕获，包括1MPZ（1-甲基哌嗪）和PZ（哌嗪）的混合物，以及MDEA（甲基二乙醇胺）和MEA的混合物。实验数据已用于评估随时间和实验条件的CO ₂吸收性能。反应器气体出口处CO ₂分数的变化已被用作溶剂降解的指标。为了模拟植物在不同实验条件下和每种溶剂下的行为，在快速反应方案的验证基础上，开发了一个动态模型。它准确地再现了吸收和汽提阶段中试工厂的行为。在溶剂的物理性质中，粘度的影响似乎对CO ₂最为关键吸收效率。溶剂降解的动力学最终经过优化以匹配实验结果。在研究的三种溶剂中，1MPZ / PZ是最稳定的，而MEA和MDEA / MEA的降解速率非常相似。

更新日期：2018-04-18

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