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We introduce the addition of stable salts to aqueous MEA as a way of inhibiting oxidative degradation reactions. We performed oxidative degradation studies in aqueous MEA containing sodium chloride (NaCl) and potassium iodide (KI). These “salted amine solvents” have been shortened to SAS. The 2.0 %wt. and 1.0 %wt. KI SAS show remarkable oxidative degradation behavior. Loss of alkalinity after 42 days of oxidative degradation experiments with the 1.0 %wt. KI SAS was of 4%, whereas that of aqueous MEA was of 40% after only 21 days. We evaluated how the addition of stable salts impacts CO2 solubility, viscosity, and thermal degradation and corrosion behavior and verify negligible deviations from aqueous MEA. Thus, addition of stable salts affects oxidative degradation phenomena without deranging CO2 solubility or mass transfer rates. With the promising inhibition behavior of KI on MEA degradation, this work presents the initial steps towards making it a commercially viable degradation inhibitor.

New energy effective solvents are in demand to make global CO2 capture feasible. Phase change solvents seem to be one avenue to reach this goal. This paper presents new experimental data and modelling results for four amines that have potential as new solvents in blends for post combustion CO2 capture. Both pure component data and data for amine-water solutions, based on ebulliometer measurements, are presented. The data were fitted to an Antoine equation and an NRTL model in two ways: first in a combined fit of both pure component and binary data and then in separate fits to the individual data sets. The methods were compared and guidelines as to which method to use, based on available data, is provided. Data for 2-(Isopropylamino)ethanol (IPAE), N-tert-Butyldiethanolamine (N-TBDEA), N-Methyl-1,3-diaminopropane (MAPA) and 1,3-diaminopropane (DAP) from the literature were collected and compared with the new data sets. 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-NDlicense (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Prosjektleder Cathrine Brecke Gundersen Aquatic monitoring of three lakes, including drinking water sources, located in close vicinity to the Technology Centre Mongstad (TCM) was conducted to look for traces of amine-discharges from CO2 capture activities. Lake water was collected in January 2020, just after the completion of a longer test campaign at TCM, and analysed for the presence of amines, nitrosamines, and nitramines, in addition to selected water chemical parameters (pH, total organic carbon, phytoplankton biomass (chlorophyll A), and nutrient content and composition). Results from the lakes were compared to results from two reference lakes and to results previously obtained during earlier monitoring work. In conclusion, no traces of amine-discharges from TCM was detected: finding no amines, nitrosamines, nor nitramines at or above their respective analytical limits for quantification, and no clear trends of increase in any of the chemical parameters anticipated to be sensitive to amine-discharges.

The carbamate stability constant for a data set of 10 amino acids, having potential for being postcombustion CO2 capture (PCC) solvents, has been calculated using various implicit and explicit solvation shell models. This work also includes an extensive study of gas-phase free energy and enthalpy for the amino acid carbamate formation reaction with the Hartree Fock method, density functional methods [B3LYP/6-311++G(d,p)], and composite methods (G3MP2B3, G3MP2, CBS-QB3, and G4MP2). Ideal PCC solvent properties require finding a profitable tradeoff between various thermodynamic and system optimization parameters. Benchmark gaseous-phase and solution-phase thermodynamic properties given in this work can help in making informed decisions when choosing promising PCC solvents. The temperature dependency of the carbamate stability constant of amino acids is predicted using PCM and SM8T implicit solvation models. PCC is a temperature swing absorption–desorption process, and the high-temperature sensitivity of the ln KcAmCOO– value is of vital importance in attaining cost-efficient processes.

CO2 Technology Centre Mongstad will be the world’s largest test centre for testing and development of CO2 capture technology. The emissions to the atmosphere from CO2 Technology Centre Mongstad contain amines and may in addition contain or lead to the formation of degradation products from amine-based CO2 capture technology. An environmental baseline survey was conducted in 2011 prior to the operation. The survey performed is broad, and describes in detail the environmental situation both in terrestrial and aquatic ecosystems as well as relevant chemical compositions of a range of matrices such as soil, plants and water. The data collected in the monitoring program were used to propose a future monitoring program in the area. CO2 Technology Centre Mongstad DA

Årsliste 2008