Monitoring of Chemical Speciation of DEA – CO₂ – Water System by Raman Spectroscopy

Abstract:

Carbon dioxide separation has gained immense importance since its detrimental effects towards our environment has been realized. Commercially, CO₂ has been captured by absorption in alkanolamines such as diethanolamine (DEA), since many years. The thermodynamics and kinetics of the process is a key factor towards its efficiency and significantly depends on its qualitative and quantitative speciation. In this work, the analysis of speciation for CO₂ loaded aqueous DEA has been performed by Raman spectroscopy. Experimentally determined CO₂ loading data and modified Kent Eisenberg equation was used to quantify the chemical species present. The speciation results were fitted with the respective characteristic Raman peaks of (CO3^-, HCO3^-, DEACOO-, DEA, DEA⁺, CO₂) by Principal Component Regression (PCR). The fitted results showed good agreement with thermodynamically predicted chemical species.

• Periodical: Advanced Materials Research (Volume 1113)
• Pages: 358-363
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1113.358
• Online since: July 2015
• Authors: Muhammad Zubair Shahid, Humbul Suleman, Adulhalim Shah Maulud*, Mohammad Azmi Bustam Khalil, Zakaria Man
• Keywords: Carbon Dioxide Capture, Raman Spectroscopy, Thermodynamic Modeling

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