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Inline monitoring of CO2 absorption processes using simple analytical techniques and multivariate modeling

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Author: Ham, L.V. van der · Bakker, D.E. · Geers, L.F.G. · Goetheer, E.L.V.
Source:Chemical Engineering and Technology, 2, 37, 221-228
Identifier: 488262
Keywords: Chemistry · Absorption · Amines · Carbon dioxide · Multivariate modeling · Process control · Industrial Innovation · Fluid Mechanics Chemistry & Energetics · PID - Process & Instrument Development · TS - Technical Sciences


The solvent and the dissolved CO2 concentrations are two essential properties of CO2 absorption processes. Currently, they are typically monitored using time-consuming offline analytical techniques. Initial development efforts aiming at a cost-effective and reliable inline monitoring system are described. Using a fractional factorial experimental design covering six solvent properties and five analytical techniques, it is demonstrated that the CO2 and solvent concentrations correlate well with the density and refractive index. Applying a simplistic multivariate model to solvent samples from an industrial pilot plant indicated good potential for predictive use. Future work should focus on the development of a more accurate multivariate model, on the modeling of more solvents, and on combining the results with available process data. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.