Heat Stable Salts (HSS) Removal by Electrodialysis: Reclaiming of MEA Used in Post-combustion CO2-Capture

Баженов, С. Л.; Vasilevsky, Vladimir; Rieder, Alexander; Unterberger, S.; Грушевенко, Е. А.; Волков, В. В.; Schallert, B.; Volkov, A. V.

doi:10.1016/j.egypro.2014.11.668

Cited by 22 publications

(12 citation statements)

References 6 publications

(6 reference statements)

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“…For each CO 2 -loading of lean MEA solution, the ED unit was design to maintain the following flowrate of HSS anions transport from the feed to the concentrate compartment at the constant level: 7 eq/h for EDI and 9.6 eq/h for EDII. Such rate of HSS removal allows maintaining their level in the absorption system below the critical value, after which the avalanche-like increase of MEA degradation products takes place as reported earlier [34]. The main parameters of the two-stage ED reclaimer with the capacity of 100 m 3 /h of lean MEA is presented in electrodialyzers of the EDI and EDII stages for each studied CO 2 load are listed in Table 3.…”

Section: Resultsmentioning

confidence: 75%

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

et al. 2019

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Heat stable salts (HSS) formed and continuously accumulated in the amine-based solvents due to solvent degradation and impurities in the feed gas can dramatically change the efficiency of the amine scrubbing process. HSS can be removed by using different methods including membrane separation such as electrodialysis (ED). In this work, we studied the effect of CO2 loading of the lean 30 wt % monoethanolamine (MEA) solution on the efficiency of HSS removal and MEA loss. In the model MEA solution containing HSS on the level of 48 meq/L, the carbon dioxide concentration was varied from 0.2 down to 0 mole (CO2)/mole (MEA). The reclaiming of model MEA solution was carried out by lab-scale two-stage ED unit when the concentrate stream after the first stage was additionally treated using ED (second stage) that allowed reducing MEA loss. It was shown that the decrease of carbon dioxide content from 0.2 down to 0 mole (CO2)/mole (MEA) resulted in a substantial reduction of both parameters—the MEA loss and the specific power consumption with respect to extracted HSS (from 140 down 37 kJ per 1 g of recovered HSS anions). This can be explained by the drop in the total concentration of ions formed by the interaction of MEA solution with carbon dioxide. However, the change of CO2 loading is associated with additional power consumption towards further solvent regeneration in the column. Based on the preliminary estimations of power consumption required for additional CO2 stripping with the respect to the power consumption of ED stage, it seems that lean solvent CO2 loading of 0.1 mole/mole provides an optimum for the power input at 25.9 MJ/kg(solvent).

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Section: Resultsmentioning

confidence: 75%

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

et al. 2019

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“…These products can also react with the construction materials of the plant, creating heat stable salts (HSS) which accumulate in the system, causing foaming, solid formation etc. [31,32]. The high volatility of most of the oxidative degradation products results in that only some of these types of degradation products can be quantified in solution samples without high error.…”

Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N V I R O N M E N Tmentioning

confidence: 99%

Degradation of Amine Solvents Used for Co2 Removal from Flue Gas with High Co₂ Concentration

Wilk

Spietz

Więcław‐Solny

et al. 2021

Architecture, Civil Engineering, Environment

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In the ethanolamine (MEA) solution, during the absorption and desorption of CO2 undesired compounds are produced as a result of degradation of an amine. Degradation not only reduces the absorption capacity of the solution but also leads to many operational problems. Furthermore, measuring of the degradation products is of great importance in terms of environmental issues. For the determination of MEA degradation products, mainly chromatographic techniques are used, sometimes coupled with other instrumental methods, e.g. GC-MS. As a part of this work, research was conducted to identify MEA thermal and oxidative degradation products and to develop a method for quantitative analysis of the main thermal degradation products such as OZD, HEIA and HEEDA and oxidative degradation products: HEA and HEI. Samples drawn from a test bench for CO2 capture from synthetic flue gas with an increased content of carbon dioxide were tested. As a research result, a method for the quantitative determination of the main degradation products was developed, the concentrations of degradation products and the rate of their formation were determined, which allows to qualify the solution shelf life.

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“…Vitse et al (2011) show that electrodialysis combined with mechanical filtration can be effective in maintaining the concentration of heat stable salts below 0.5 wt% in a proprietary advanced amine solvent (Dow UCARSOL TM FGC 3000), but provide no process information on the operation of the ED unit. Bazhenov et al (2014) describe a two stage ED operation tested on an MEA solution that was capturing carbon dioxide from a bituminous-coal fired power station for up to 1000 h of operation. In single stage operation, the total anion concentration was reduced from 2.3 g/L to 0.9 g/L within an hour, with all anions including nitrate, sulfate, formate, acetate and oxalate reducing substantially in concentration.…”

Section: Introductionmentioning

confidence: 99%

Remediation of monoethanolamine after exposure to brown coal flue gases

Lim

Aguiar

Reynolds

et al. 2015

International Journal of Greenhouse Gas Control

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a b s t r a c tMonoethanolamine (MEA) is the solvent most commonly considered for post-combustion capture. However, the solvent will accumulate a range of contaminants during use, notably heat stable salts, that reduce its performance. This work considers the removal of these contaminants from MEA solutions that had been exposed to over 50 and 1800 h of post combustion capture of flue gases from a brown coal-fired power station. Analysis indicated that these MEA solutions contained significant quantities of heat stable salts including iron, potassium, sulphate, nitrate and organic anions, particularly in the older sample. Both solutions were initially neutralised to free the protonated amine, which led to precipitation of some impurities within the older solvent. Nanofiltration was considered as an approach to further concentrate impurities, but was ineffective due to low permeation rates and low rejection of monovalent salts, at less than 20%. It was effective in concentrating metal contaminants and may be useful into the future for this reason. Conversely, electrodialysis was effective in removing up to 91% of the ionic content of the solutions, although the current efficiency fell at low feed conductivities. Monovalent salts such as sodium, potassium and nitrate were removed more readily than multivalent salts such as iron and sulphate. MEA loss was consistent with our prior work at around 0.15 g/m 2 s and was predominantly as the free amine rather than the carbamate salt.

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Heat Stable Salts (HSS) Removal by Electrodialysis: Reclaiming of MEA Used in Post-combustion CO2-Capture

Cited by 22 publications

References 6 publications

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

Degradation of Amine Solvents Used for Co2 Removal from Flue Gas with High Co₂ Concentration

Remediation of monoethanolamine after exposure to brown coal flue gases

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Heat Stable Salts (HSS) Removal by Electrodialysis: Reclaiming of MEA Used in Post-combustion CO2-Capture

Cited by 22 publications

References 6 publications

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

Effect of Carbon Dioxide Loading on Removal of Heat Stable Salts from Amine Solvent by Electrodialysis

Degradation of Amine Solvents Used for Co2 Removal from Flue Gas with High Co2 Concentration

Remediation of monoethanolamine after exposure to brown coal flue gases

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Degradation of Amine Solvents Used for Co2 Removal from Flue Gas with High Co₂ Concentration