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KMID : 1024520160250030385
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Journal of the Environmental Sciences
2016 Volume.25 No. 3 p.385 ~ p.393
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Degradation of Monoethanolamine during Continuous Operation of a Laboratory Scale CO2 Absorption System
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Kang Ji-A
Woo Won-gu
Lim Ho-Jin
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Abstract
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Oxidative and thermal degradation of alkanolamines for a promising CO2 capture technology of absorption might cause
decrease in CO2 capture efficiency and formation of hazardous byproducts. In this study, characteristics of a representative absorbent of monoehtanolamine (MEA) were examined for a long term operation using a laboratory scale absorption system.
An CO2 absorption system with ID 56 mm and absorption zone height 100 cm was developed for the characterization.
Absorption solution of 30 wt% MEA was circulated at 100 mL/min to treat air with 15% CO2 and 1 ppm NO at 10 L/min.
Temperatures of absorber and stripper were maintained at 40℃ and 120℃, respectively. For the course of 5 weeks continuous operation, MEA concentration was decreased approximately by 70% and CO2 removal efficiency was dropped from 95% to 65%. Ionic byproducts of NH4+, NO2-, and NO3- were accumulated up to 48 g/mL, 0.2 g/mL, and 1.5 g/mL, respectively,tracking the variation of MEA concentration. Formation of various organic byproducts were also observed
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KEYWORD
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Alkanolamine, Monoethanolamine(MEA), Carbon dioxide, Absorption, Degradation
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