Carbon dioxide Induced degradation of diethanolamine during absorption and desorption processes

Islam, M, Dhanavath, K, Kao, N, Bhattacharyya, P, Ali, B and Yusoff, R 2018, 'Carbon dioxide Induced degradation of diethanolamine during absorption and desorption processes', Chinese Journal of Chemical Engineering, vol. 26, no. 2, pp. 293-302.


Document type: Journal Article
Collection: Journal Articles

Title Carbon dioxide Induced degradation of diethanolamine during absorption and desorption processes
Author(s) Islam, M
Dhanavath, K
Kao, N
Bhattacharyya, P
Ali, B
Yusoff, R
Year 2018
Journal name Chinese Journal of Chemical Engineering
Volume number 26
Issue number 2
Start page 293
End page 302
Total pages 10
Publisher Chemical Industry Press
Abstract Alkanolamines are widely used in the purification of the sour gas sweetening process. During the sour gas absorption process, CO2 significantly degrades the amine solvent and creates enormous problems for plant operation. In this work, CO2 induced degradation of aqueous diethanolamine (DEA) solution was conducted in a 1.25L jacketed glass reactor that functioned as an absorber and stripper at atmospheric conditions. Pure CO2 was bubbled through the reactor until the solution became saturated. In this study, the concentrations of DEA used were in the range of concentrations between 2M to 4M. In the degradation experiment, six generic cycles were conducted for each run. Each cycle was configured with the absorption and desorption of carbon dioxide at 55 °C and 100 °C, respectively. Samples were collected after a predetermined experimental time and analyzed by ion chromatography (IC) to identify unknown ionic degradation products (DGPs). In the IC analysis, three different columns were used for anion, cation and ion exclusion systems, which are Metrosep A Supp 5 150/4.0, Metrosep C Supp 4 150/4.0 and Metrosep Organic Acids, respectively. The major identified DGPs of D01DEA2M, D02DEA3M, and D03DEA4M are nitrite, acetate and ammonium. Phosphate product was found in the degraded amine samples which might be due to the contamination of water or chromatographic system.
Subject Carbon Capture Engineering (excl. Sequestration)
Membrane and Separation Technologies
Chemical Engineering not elsewhere classified
Keyword(s) Degradation
Diethanolamine
Absorption
Stripping
Gas Sweetening Process
DOI - identifier 10.1016/j.cjche.2017.06.003
Copyright notice © 2017 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
ISSN 1004-9541
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