Study on Degradation Performance of Mixed Amine Absorbent for Carbon Capture From Coal-Fired Flue Gas

doi:10.12096/j.2096-4528.pgt.260202

Abstract

Abstract:

Objectives The stability of chemical absorbents is key to the stable operation of chemical absorption carbon capture systems. Therefore, the oxidative and thermal degradation of a novel mixed amine absorbent BA-1 is investigated, along with the evaluation of anti-degradation agents. Methods The thermal degradation behavior of BA-1 is investigated using a thermal degradation experimental device under different temperatures (100, 120, and 140 ℃) and CO₂ loading concentrations (0-1.5 mol/L). Meanwhile, the oxidative degradation performance of BA-1 is assessed at 65 ℃ under a pure oxygen atmosphere using an oxidative degradation experimental device. The degradation rate and degradation products of BA-1 are analyzed using cation and anion chromatography techniques. The antioxidant effects of 2,5-dimercapto-1,3,4-thiadiazole (DMTD), chelating agent E-1, sodium sulfite (Na₂SO₃), and acetaldehyde oxime (AAO) are tested. Results The degradation of BA-1 is mainly caused by oxidative degradation. After the addition of E-1, Na₂SO₃, and AAO, the degradation rate of BA-1 is effectively suppressed. When 0.3% of E-1 is added, the degradation rate of BA-1 over 24 days is only 22.5%, with the degradation inhibition rate reaching 53.8%. The primary degradation products include formate, acetate, oxalate, and nitrate ions. The yield of oxidative degradation products is more than ten times that of thermal degradation products, further confirming that oxidative degradation is the main degradation mechanism of the BA-1 absorbent. Conclusions The degradation of mixed amine absorbents is mainly caused by oxidative degradation, and the addition of chelating agents can effectively mitigate absorbent degradation during industrial applications.

Key words: carbon capture, greenhouse gas, mixed amine absorbent, thermal degradation, oxidative degradation, antioxidant, carbon capture, utilization and storage (CCUS)

CLC Number:

TK 09

Chenxiang YAO, Zhengrong WANG, Zhixiang XIA, Chao LI, Luchang SUN, Kailiang WANG, Ximing HU, Mengxiang FANG. Study on Degradation Performance of Mixed Amine Absorbent for Carbon Capture From Coal-Fired Flue Gas[J]. Power Generation Technology, 2026, 47(2): 248-256.

Figures/Tables 12

Tab. 1 Chemical reagents used in experiment

化学试剂	分子结构
乙醇胺(MEA)
羟乙基乙二胺(AEEA)
2，5-二巯基-1，3，4-噻二唑 (DMDT)
亚硫酸钠(Na₂SO₃)
乙醛肟(AAO)
四水合氯化亚铁(FeCl₂·4H₂O)

Fig. 1 Schematic diagram of thermal degradation experimental device

Fig. 2 Schematic diagram of oxidative degradation experimental device

Fig. 3 Variation trends of BA-1 degradation rate with time under different CO2 loadings at 100 ℃, 120 ℃, and 140 ℃

Fig. 4 The degradation rate of the BA-1 absorbent at different temperatures with varying loadings (14 days)

Fig. 5 Variation of BA-1 absorbent degradation rate with time

Fig. 6 Day-24 degradation rate of BA-1 absorbent

Fig. 7 Variation of BA-1 absorbent degradation rate with time after adding different antioxidants

Fig. 8 Day-24 degradation rate of BA-1 absorbent after adding different antioxidants

Fig. 9 Anion product analysis

Fig. 10 Formation mechanism of formate and nitrate during thermal degradation

Fig. 11 Formation mechanism of carboxylate degradation products during oxidative degradation

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