Absorptive Desulfurization of Model Biogas Stream Using Choline Chloride-Based Deep Eutectic Solvents

Słupek, Edyta; Makoś, Patrycja

doi:10.3390/su12041619

Cited by 22 publications

(10 citation statements)

References 55 publications

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“…The conducted research indicates that an increase in the flow rate from 10 to 50 mL/min slightly decreased the effectiveness of siloxane removal from the model biogas stream. Similar results were observed in the previous studies [ 29 , 64 ]. In the industrial technologies used with the use of a water scrubber, a flow of 88 mL/min is used to remove CO 2 or H 2 S [ 65 ], whereas when using an amine scrubber, flows of 30 mL/min are used [ 66 ].…”

Section: Resultssupporting

confidence: 93%

“…Therefore, deep eutectic solvents (DESs) are a good alternative to ILs because they are much cheaper, less toxic, and more biodegradable [ 23 ]. These advantageous properties have made DESs widely used in various separation processes such as extraction [ 24 , 25 , 26 , 27 ], absorption [ 28 , 29 , 30 , 31 , 32 , 33 ], or adsorption [ 34 ]. So far, DES has not been used for the experimental removal of siloxanes from biogas.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

2021

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The paper presents the screening of 20 deep eutectic solvents (DESs) composed of tetrapropylammonium bromide (TPABr) and glycols in various molar ratios, and 6 conventional solvents as absorbents for removal of siloxanes from model biogas stream. The screening was achieved using the conductor-like screening model for real solvents (COSMO-RS) based on the comparison of siloxane solubility in DESs. For the DES which was characterized by the highest solubility of siloxanes, studies of physicochemical properties, i.e., viscosity, density, and melting point, were performed. DES composed of tetrapropylammonium bromide (TPABr) and tetraethylene glycol (TEG) in a 1:3 molar ratio was used as an absorbent in experimental studies in which several parameters were optimized, i.e., the temperature, absorbent volume, and model biogas flow rate. The mechanism of siloxanes removal was evaluated by means of an experimental FT-IR analysis as well as by theoretical studies based on σ-profile and σ-potential. On the basis of the obtained results, it can be concluded that TPABr:TEG (1:3) is a very effective absorption solvent for the removal of siloxanes from model biogas, and the main driving force of the absorption process is the formation of the hydrogen bonds between DES and siloxanes.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

2021

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“…In addition, physicochemical properties can be fine-tuned by selecting the appropriate components for DES preparation [ 23 ]. Due to these unique properties, DESs have been successfully applied for gas separation [ 25 , 26 , 27 , 28 , 29 ], water and wastewater purification, fuel desulfurization, removal of lignin from biomass, sample preparation [ 30 , 31 , 32 ], etc. However, there are little studies on the DES’ application for the extraction of fermentation inhibitors or value-added products from post-fermentation broth [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Extraction of Fermentation Inhibitors by Means of Green Hydrophobic Deep Eutectic Solvents

et al. 2021

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The methods for hydrogen yield efficiency improvements, the gaseous stream purification in gaseous biofuels generation, and the biomass pretreatment are considered as the main trends in research devoted to gaseous biofuel production. The environmental aspect related to the liquid stream purification arises. Moreover, the management of post-fermentation broth with the application of various biorefining techniques gains importance. Chemical compounds occurring in the exhausted liquid phase after biomass pretreatment and subsequent dark and photo fermentation processes are considered as value-added by products. The most valuable are furfural (FF), 5-hydroxymethylfurfural (HMF), and levulinic acid (LA). Enriching their solutions can be carried with the application of liquid–liquid extraction with the use of a suitable solvent. In these studies, hydrophobic deep eutectic solvents (DESs) were tested as extractants. The screening of 56 DESs was carried out using the Conductor-like Screening Model for Real Solvents (COSMO-RS). DESs which exposed the highest inhibitory effect on fermentation and negligible water solubility were prepared. The LA, FF, and HMF were analyzed using FT-IR and NMR spectroscopy. In addition, the basic physicochemical properties of DES were carefully studied. In the second part of the paper, deep eutectic solvents were used for the extraction of FF, LA, and HMF from post-fermentation broth (PFB). The main extraction parameters, i.e., temperature, pH, and DES: PFB volume ratio (VDES:VPFB), were optimized by means of a Box–Behnken design model. Two approaches have been proposed for extraction process. In the first approach, DES was used as a solvent. In the second, one of the DES components was added to the sample, and DES was generated in situ. To enhance the post-fermentation broth management, optimization of the parameters promoting HMF, FF, and LA extraction was carried under real conditions. Moreover, the antimicrobial effect of the extraction of FF, HMF, and LA was investigated to define the possibility of simultaneous separation of microbial parts and denatured peptides via precipitation.

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“…Additionally, they are also non-toxic and biodegradable, and their synthesis is simple and cheap [27][28][29]. Due to the favorable properties of DESs, they are used in many processes, i.e., extraction [30][31][32][33][34], sample preparation [35], absorption [36][37][38][39], adsorption [40], metal electrodeposition [41], and biotransformations [42]. In addition, there are a lot of studies on the application of DESs for the removal of inorganic contaminants from gas streams, i.e., those of CO 2 [43][44][45], H 2 S [46], SO 2 [47], H 2 O [48], NH 3 [49].…”

Section: Introductionmentioning

confidence: 99%

New Carvone-Based Deep Eutectic Solvents for Siloxanes Capture from Biogas

Makoś

Słupek

Kramarz

et al. 2021

IJMS

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During biogas combustion, siloxanes form deposits of SiO2 on engine components, thus shortening the lifespan of the installation. Therefore, the development of new methods for the purification of biogas is receiving increasing attention. One of the most effective methods is physical absorption with the use of appropriate solvents. According to the principles of green engineering, solvents should be biodegradable, non-toxic, and have a high absorption capacity. Deep eutectic solvents (DES) possess such characteristics. In the literature, due to the very large number of DES combinations, conductor-like screening models for real solvents (COSMO-RS), based on the comparison of siloxane activity coefficient of 90 DESs of various types, were studied. DESs, which have the highest affinity to siloxanes, were synthesized. The most important physicochemical properties of DESs were carefully studied. In order to explain of the mechanism of DES formation, and the interaction between DES and siloxanes, the theoretical studies based on σ-profiles, and experimental studies including the 1H NMR, 13C NMR, and FT-IR spectra, were applied. The obtained results indicated that the new DESs, which were composed of carvone and carboxylic acids, were characterized by the highest affinity to siloxanes. It was shown that the hydrogen bonds between the active ketone group (=O) and the carboxyl group (-COOH) determined the formation of stable DESs with a melting point much lower than those of the individual components. On the other hand, non-bonded interactions mainly determined the effective capture of siloxanes with DES.

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Absorptive Desulfurization of Model Biogas Stream Using Choline Chloride-Based Deep Eutectic Solvents

Cited by 22 publications

References 55 publications

Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

Efficient Extraction of Fermentation Inhibitors by Means of Green Hydrophobic Deep Eutectic Solvents

New Carvone-Based Deep Eutectic Solvents for Siloxanes Capture from Biogas

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