Estimating speciation of aqueous ammonia solutions of ammonium bicarbonate: Application of least squares methods to infrared spectra
OPEN ACCESS
Loading...
Author / Producer
Date
2019-07-01
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
The knowledge of the speciation and of the supersaturation of aqueous solutions of CO2 and NH3 is pivotal for the design and optimization of unit operations, e.g. absorption or crystallization, in the framework of ammonia-based CO2 capture systems. For this information to be available, however, complex analytical techniques and significant experimental effort are required. This work introduces a methodology for the estimation of the concentration of species in aqueous ammonia solutions of ammonium bicarbonate by using attenuated total reflection infrared spectroscopy (ATR-FTIR) and spectral modeling based on least squares methods. In particular, the methodology can be exploited for the on-line monitoring of the liquid composition of crystallizing suspensions of ammonium bicarbonate for which the information on the speciation is combined with a rigorous thermodynamic model to compute the activity-based supersaturation. Finally, this work paves the way for the estimation of the crystallization kinetics of ammonium bicarbonate formation in aqueous ammonia solutions which is of great importance for the design of industrial CO2 capture absorption processes that exploit solid formation.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
4 (7)
Pages / Article No.
1284 - 1302
Publisher
Royal Society of Chemistry
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03484 - Mazzotti, Marco (emeritus) / Mazzotti, Marco (emeritus)