Print Email Facebook Twitter Comparison of Raman, NIR, and ATR FTIR spectroscopy as analytical tools for in-line monitoring of CO2 concentration in an amine gas treating process Title Comparison of Raman, NIR, and ATR FTIR spectroscopy as analytical tools for in-line monitoring of CO2 concentration in an amine gas treating process Author Kachko, A. van der Ham, L.V. Bardow, A. Vlugt, T.J.H. Goetheer, E.L.V. Publication year 2016 Abstract Chemical absorption of CO2 using aqueous amine-based solvents is one of the common approaches to control acidic gases emissions to the atmosphere. Improvement in the efficiency of industrial processes requires precise monitoring tools that fit with the specific application. Process monitoring using in-line multivariate measurement methods provides access to time resolved data of the reaction progress and the composition of the reaction mixture. Fast acquisition of valuable information about the process on site can be used for automated monitoring and process control, saving operational costs and reducing waste products. Therefore, different analytical techniques are being explored for the purpose of their practical application in process analysis. This work compares three vibrational spectroscopy techniques for monitoring CO2 absorption by aqueous monoethanolamine (MEA) solutions: Raman spectroscopy, near infra-red (NIR) spectroscopy, and attenuated total reflectance Fourier transform infra-red (ATR FTIR) spectroscopy. The spectroscopic information has been used to estimate the concentration of CO2 captured by the chemical solvent. The study aims to determine the potential applicability of the spectroscopic methods to the in-line and real time monitoring of a post-combustion capture process. Partial least squares (PLS) regression models were built based on the spectroscopic data before and after spectra pretreatment procedures. All three spectroscopic methods are shown to be well suited. The estimation model constructed using NIR data provides the highest accuracy for estimation of the CO2 loading, with an average deviation of about 0.01 molCO2/molMEA. The models based on Raman and ATR FTIR measurements show deviations of around 0.02 molCO2/molMEA. Subject Fluid & Solid MechanicsPID - Process & Instrumentation DevelopmentTS - Technical SciencesHigh Tech Systems & MaterialsChemistryIndustrial InnovationChemometricsCO2 absorptionProcess analytical technologyVibrational spectroscopyCarbon dioxideEthanolaminesFourier transform infrared spectroscopyInfrared devicesLeast squares approximationsProcess monitoringRegression analysisSpectroscopic analysisSupersaturationVibrational spectroscopyWaste incinerationATR FT-IR spectroscopiesAttenuated total reflectancePartial least-squares regressionPost-combustion capturesProcess analytical technologySpectroscopic informationProcess control To reference this document use: http://resolver.tudelft.nl/uuid:b6730b75-51a2-4a77-ae94-c97d4b81cfff TNO identifier 532876 Publisher Elsevier, Amsterdam ISSN 1750-5836 Source International Journal of Greenhouse Gas Control, 47, 17-24 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.