Chemical stability and biodegradability of new solvents for CO2 capture

Eide-Haugmo, Ingvild; Lepaumier, Hélène; Einbu, Aslak; Vernstad, Kai; Silva, Eirik Falck da; Svendsen, Hallvard F.

doi:10.1016/j.egypro.2011.02.034

Cited by 53 publications

(44 citation statements)

References 12 publications

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“…Another reason for the small amounts of OZD in pilot samples could be higher amounts of typical thermal degradation compounds as HEEDA and HEIA as these compounds can be formed from OZD (Lepaumier et al 2011). In all our experiments the HEPO formation is low compared to what is found in pilot samples, being generally low compared to other secondary degradation compounds as HEGly, OZD, HEF and HEI.…”

Section: Hegly Hepo and Ozdmentioning

confidence: 63%

“…Based on these data conclusions regarding possible formation of other amines, e.g. N-(2-hydroxyethyl)ethylene diamine (HEEDA) which is formed in thermal degradation experiment with CO2 (Davis and Rochelle 2009;Eide-Haugmo et al 2011;Lepaumier et al 2011a), cannot be drawn. Nevertheless, if formation of other amines is occurring the amount is low in the present experiments compared to the cited thermal degradation experiments with CO2.…”

Section: Amine Lossmentioning

confidence: 96%

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Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Vevelstad

Johansen

Knuutila

et al. 2016

International Journal of Greenhouse Gas Control

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Post combustion CO2 capture using amines as chemical absorbents is a relatively mature technology. Rate of reaction and desorption energy demand are normally prime criteria for evaluation of new solvents while degradation and corrosion studies are often postponed. However, degradation and corrosion are in many cases showstoppers and should be considered at an early stage. In this work, a systematic study has been conducted on oxidative degradation of 30 wt% ethanolamine (MEA) for oxygen concentrations: 6, 21, 49 and 98% and temperatures: 55, 65 and 75 °C. The formation of ten primary degradation compounds (acids, ammonia and alkyl amines) and seven secondary degradation compounds (HEGly, OZD, HEPO, HEF, HEA, HEI and BHEOX was monitored as function of time over a period of 3 -6 weeks. The full comprehensive data set is available in the supplementary information for development of models describing the degradation behavior. Suggested mechanisms for formation of seven secondary degradation compounds; HEGly, HEPO, OZD, HEF, HEA, BHEOX and HEI from literature were compiled and discussed in view of the experimental results to suggest pathways which are more likely than others.The rate of MEA degradation increases with increasing temperature and oxygen concentration. The overall nitrogen balances were closed within 83-97%; the higher deviations observed at the highest temperature, 75 o C. HEF, HEI and ammonia were the degradation compounds that most significantly contributed to the nitrogen balance in most experiments. However, at 6% O2 content, HEGly was the major nitrogen containing degradation compound identified. Formate was found to be the major anionic compound in all experiments.HEGly formation was found to be independent on O2 partial pressure, but this may not be true for the further reaction of HEGly. The results suggests OZD formation to be oxygen dependent. However, only one mechanism is so far suggested for an oxygen dependent pathway. Both OZD and HEPO concentrations increase with oxygen concentration. Separate laboratory experiments at constant temperature (55-75 o C) do not capture the HEPO formation seen in pilot plant samples indicating that higher temperatures and/or temperature cycles are necessary.The results clearly show that performing accelerated degradation tests with 98% oxygen cannot easily be extrapolated to what happens at 6% oxygen, and therefore may not be representative for the situation in an industrial plant both with regard to rates of formation and products formed.

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Section: Hegly Hepo and Ozdmentioning

confidence: 63%

Section: Amine Lossmentioning

confidence: 96%

Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Vevelstad

Johansen

Knuutila

et al. 2016

International Journal of Greenhouse Gas Control

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“…Zurzeit unterscheidet man insgesamt vier verschiedene Arten von Amin-Degradationsprozessen, die alle Besonderheiten hinsichtlich ihrer Parameterabhängigkeit aufweisen: -oxidative Degradation [33], -thermische Degradation [34], -Amin-Degradation unter Anwesenheit von CO 2 [35] und -Biodegradation [36]. Es gibt somit eine Vielzahl von Zersetzungsprodukten aus jedem der verschiedenen Amin-Degradationsmechanismen.…”

Section: Degradation Von Amineunclassified

“…Letztendlich sind nach [36] gegebenenfalls auch Absorptionsauswirkungen durch Anwendung von wässrigen Lösun-gen mit verschiedenen Salzgehalten und unterschiedlichen Belastungen an Mikroorganismen (Biodegradation) zu erwarten. Speziell hierzu findet man in der Literatur jedoch so gut wie keine weiteren Erkenntnisse.…”

Section: Thermische Degradation Von Meaunclassified

Degradation and Energy Characteristics of Reactive Amine Solvents during CO₂ Absorption/Desorption

Ewert

Kemper

Algayer

et al. 2011

Chemie Ingenieur Technik

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Degradation and Energy Characteristics of Reactive Amine Solvents during CO 2 Absorption/ DesorptionReactive absorption using aqueous amine solutions is the technically most feasible retrofit option for the separation of CO 2 from flue gases. Frequently discussed issues are the realization of a cost-effective increase in efficiency in the sophisticated overall absorption process and the minimization of the energy demand for solvent regeneration under operating conditions. However, the influence of degradation phenomena on capacity and energy efficiency during the absorption-regeneration cycles using blended monoethanolamine solutions has been less considered so far. The decrease in capacity depends in particular on time, temperature, O 2 -and SO 2 concentration in the flue gas and has to be considered in plant design. Addition of degradation inhibitors decreases the energy requirements.

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“…Among the different criteria that must be taken into account in the choice of a solvent (absorption performances and energy consumption for the solvent regeneration, solvent resistance against degradation [4] which can induce corrosion problems [5] and higher solvent consumption, solvent toxicity [6] and volatility [7], etc. ), many technical and economic studies (such as [8]) highlighted that the two most important criteria in a solvent screening are absorption and regeneration efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

2014

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This study focused on the screening of new hybrid solvents (mixture of a chemical (usually an amine) and a physical (ether, alcohol, etc.) solvent) for the post-combustion CO2 capture process by chemical absorption. Such scrubbing solutions aim at combining the advantages of the two components, namely: a low regeneration energy and a high absorption capacity of the physical solvent at intermediate CO2 partial pressures, a better absorption performances of the chemical solvent at low CO2 partial pressures and also high absorption kinetics due to chemical reactions with CO2. The innovative aspect of our approach was based on the use of acetals as physical components of the hybrid solvent. The purpose of our study was to characterize and compare these new hybrid solvents in terms of absorption and regeneration performances using two types of screening tests. Different blended solutions (composed of a conventional amine such as monoethanolamine (MEA), diethanolamine (DEA), 2-amino-2-methyl-1-propanol (AMP)) and an acetal compound such as 2,5,7,10-tetraoxaundecane (TOU) were tested. Regarding the absorption performances, a double stirred cell reactor was used to compare the absorption efficiencies of the solvents at 298 K. It was observed that the addition of the acetal compound improves significantly the absorption efficiencies, especially at the beginning of the batch absorption test, namely at low CO2 loadings of the solution. Meanwhile, regeneration tests were performed using a regeneration cell allowing to compare the regeneration efficiency of the solvents at fixed heating power (600 W). The higher cyclic capacities and better regeneration efficiencies with acetals base solvents were also highlighted. Globally, this work confirms through this first step that new hybrid solvents, composed of amine(s) and acetal, could be a very promising alternative to classical solvents. NomenclatureA [%] CO2 absorption ratio of the scrubbing solution CCO2 [mol m -3 ] CO2 concentration of the scrubbing solution GCO2,in [m³ s -1 ] CO2 gas flow rate at the inlet of the gas-liquid contactor GCO2,out [m³ s -1 ] CO2 gas flow rate at the outlet of the gas-liquid contactor IC [kg m -3 ] inorganic carbon content of the scrubbing solution t [s] time yCO2,in [vol.%] CO2 volume fraction of the gas phase at the inlet of the gas-liquid contactor yCO2,out [vol.%] CO2 volume fraction of the gas phase at the outlet of the gas-liquid contactor ηregen [%] regeneration efficiency of the scrubbing solution

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Chemical stability and biodegradability of new solvents for CO2 capture

Cited by 53 publications

References 12 publications

Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Degradation and Energy Characteristics of Reactive Amine Solvents during CO₂ Absorption/Desorption

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

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Chemical stability and biodegradability of new solvents for CO2 capture

Cited by 53 publications

References 12 publications

Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Extensive dataset for oxidative degradation of ethanolamine at 55–75°C and oxygen concentrations from 6 to 98%

Degradation and Energy Characteristics of Reactive Amine Solvents during CO2 Absorption/Desorption

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

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Product

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Degradation and Energy Characteristics of Reactive Amine Solvents during CO₂ Absorption/Desorption