Theoretical and Economic Evaluation of Low-Cost Deep Eutectic Solvents for Effective Biogas Upgrading to Bio-Methane

Słupek, Edyta; Makoś, Patrycja; Gębicki, Jacek

doi:10.3390/en13133379

Cited by 44 publications

(24 citation statements)

References 62 publications

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“…The conductor-like screening model for real solvents (COSMO-RS) was used to calculate the solubility of siloxanes in pure glycols and water and in DESs composed with TPABr and glycols. Based on the previous studies, it can be deduced that COSMO-RS is a useful tool for solvent screening and predicting the impurities’ solubility in conventional as well as non-conventional solvents [ 35 , 41 , 42 ]. In most of the published works, the selection of solvents is made on certain parameters, i.e., Henry’s constant and activity coefficient.…”

Section: Resultsmentioning

confidence: 99%

“…The results are often inconsistent. However, the most important parameter from the industrial point of view, solubility, is rarely reported [ 35 , 43 ]. Therefore, in this study, we calculated the solubility of individual siloxanes (L2, L3, and D4) in various DESs composed of TPABr as HBA and glycols, i.e., ethylene glycol (EG), glycerol (Gly), triethylene glycol (TriEG), tetraethylene glycol (TEG), and diethylene glycol (DEG), as HBD at various molar ratios (1:3; 1:4; 1:5; 1:6, HBA:HBD).…”

Section: Resultsmentioning

confidence: 99%

“…The geometry optimization of TPABr:TEG (1:3) was performed by means of the continuum solvation COSMO model at the BVP86/TZVP level of theory. The level of theory was used based on previous studies [ 35 , 36 ]. Multiple starting geometries of TPABr:TEG (1:3) were created and optimized in the gas phase to identify stable conformers.…”

Section: Methodsmentioning

confidence: 99%

“…So far, DES has not been used for the experimental removal of siloxanes from biogas. Only theoretical studies can be found in the literature [ 35 ].…”

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…So far, DES has not been used for the experimental removal of siloxanes from biogas. Only theoretical studies can be found in the literature [ 35 ].…”

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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“…However, ILs are costly, and this is a significant hurdle for their large-scale commercial applications. Deep eutectic solvents (DES) have been introduced and considered as another class of ILs (Alkhatib et al, 2020;Słupek et al, 2020). Although DESs have the same characteristics as ILs, the price is significantly lower than ILs (Pena-Pereira and Namieśnik, 2014; Kamgar et al, 2017), making them more attractive for large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

Simulation study of deep eutectic solvent-based biogas upgrading process integrated with single mixed refrigerant biomethane liquefaction

et al. 2020

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Deep eutectic solvents (DESs) comprise ChCl/urea, in combination with water, have been considered in removing acid gases (CO2 and H2S) from biogas. The evaluation of DES for biogas upgrading at relatively high pressure (i.e., >8.0 bar) has not been reported before. The aqueous DES performance has also not been analyzed compared to conventional amines-based solvent (MEA) and ionic liquid (IL). To the best of our knowledge, this is the first study that presents the integration of DES-based biogas upgrading with a mixed refrigerant liquefaction process to facilitate the safe and economical transportation of biomethane over long distances. The biogas considered in this study consisted of 60% CH4, 39% CO2, and 1% H2S. The aqueous ChCl/urea (70 wt%) results in biomethane with ≥99.0 wt% purity and ≥97.0 wt% recovery. Then, this biomethane was liquefied with ≥90% liquefaction rate. Based on the results obtained herein, overall capital, operating, and total annualized cost savings of 2.8%, 25.82%, and 14.26% were achieved using the 70% DES-based integrated process in comparison with the MEA-based integrated process. Whereas 1.41%, 16.85%, and 8.71% capital, operating, and total annualized costs could be saved in comparison with the IL (i.e., [Bmim][PF6])-based integrated process. It could be deduced that the overall cost of the biomethane value chain can be reduced using the proposed approach.

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Experimental and computational studies on isolation of cardanol from cashew nut shell liquid using diethanolamine‐based deep eutectic solvent at different molar ratios

Malaiyarasan,

Devakumar Vethakkan J,

Ramalingam

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDAmine‐based deep eutectic mixtures composed of choline chloride with DEA‐based hydrogen bond donor in various mole ratios like 1:2, 1:3, 1:4, 1:5, 1:6, and 1:7 for isolation of cardanol from cashew nut shell liquid.RESULTSIn this study, green techniques were created to extract cardanol from cashew nut shell liquid (CNSL) by utilizing a deep eutectic solvent based on diethanolamine with various mole ratios (hydrogen bond acceptor: hydrogen bond donor) in 1:2, 1:3,1:4,1:5, 1:6 and 1:7. To enhance cardanol's solubility in DES, promote phase separation, and increase cardanol yield, ethyl acetate (EA) and isobutyl methyl ketone (IBMK) could be utilized as co‐solvents. At temperatures ranging from 293 to 343.15 K and 1 atm, the density of various mole ratios of DES was determined. Additionally, the prepared DES pH behaviour as well as the relationship between pH and temperature. For all investigated DES temperature increases caused a decrease in pH value. By using thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC), the similar mole ratios of amine‐based DES were studied for their thermal stability in terms of decomposition temperature, mass loss, and melting temperature. The melting temperature and thermal stability were both increased in this case when the HBD increased. The thermal stability of DES, which mostly depends on intermolecular interactions, is greatly influenced by HBD. Finally, at T = 298.15 K and 1 atm, cardanol was extracted from 50 mL of CNSL using different volumes of various mole ratios of DES (100 mL, 75 mL, 50 mL, and 25 mL) together with 25 mL of IBMK and 25 mL of EA. By using FT‐IR and GC–MS spectra, the extracted cardanol was evaluated.CONCLUSIONIt was observed that the yield of cardanol from each prepared mole ratios ratio of 100 mL DES was 96.57%, 95.38%, and 92.87%, respectively. In this study, the sigma potential and sigma profile of chosen HBA and HBD were determined using the conductor‐like screening model for real solvents (COSMO‐RS), and analyze the interactions between the molecules during the extraction process. The findings demonstrated the viability of using the chosen DES as extracting solvents for the polyphenol extraction process.This article is protected by copyright. All rights reserved.

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Theoretical and Economic Evaluation of Low-Cost Deep Eutectic Solvents for Effective Biogas Upgrading to Bio-Methane

Cited by 44 publications

References 62 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

Simulation study of deep eutectic solvent-based biogas upgrading process integrated with single mixed refrigerant biomethane liquefaction

Experimental and computational studies on isolation of cardanol from cashew nut shell liquid using diethanolamine‐based deep eutectic solvent at different molar ratios

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