CO2 absorption studies in amino acid-anion based ionic liquids

Sistla, Yamini Sudha; Khanna, Ashok

doi:10.1016/j.cej.2014.09.043

Cited by 192 publications

(127 citation statements)

References 44 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…Preparation of [Cho][AA]s Solutions: The ILs were prepared using a previously developed methodology. [16] In a 250 mL flask, 0.5 mol of the chosen AA and an excess of potassium hydroxide (30.9 g, Carlo Erba, purity ≥85%) were mixed at RT in ethanol (200 mL, supplied by Merck, purity ≥99.8%) under stirring. The potassium salt of the AA was formed, the suspension turned white while the excess of potassium salt precipitated.…”

Section: Methodsmentioning

confidence: 99%

Enhanced CO₂ Absorption in Organic Solutions of Biobased Ionic Liquids

Davarpanah

Hernández

Latini

et al. 2019

Advanced Sustainable Systems

View full text Add to dashboard Cite

and in the field of biomass conversion. Future applications for CO 2 separation technologies are presumed to be within the so-called carbon capture and utilization (CCU) route. [6][7][8] The idea is to exploit CO 2 as a raw material for further chemical or industrial use and, thus, to valorize it by recycling. In the long term, CCU aims the development of a circular economy concept with neutral carbon emissions.Absorption is one of the main techniques used for CO 2 capture, [9] it relies on either chemical or physical interactions between the solvent and the solute CO 2 . In physical absorption, intermolecular forces, such as Coulomb, Van-der-Waals or other dispersion forces dominate the solute-solvent interactions. In chemical absorption, CO 2 chemically reacts with the solvent molecules and forms covalent bonds. Due to their stoichiometric reaction with CO 2 , their CO 2 absorption capacity is very high even at low CO 2 partial pressures. Chemical absorption is particularly appropriate if CO 2 is to be recovered from flue gas streams with relatively low concentrations. The major advantages of chemical absorption processes are the high selectivity for CO 2 and the high achievable gas product purity.The most commonly used chemical absorbents are amines (15-60 wt%) in aqueous solutions (i.e., typical loading of 0.5 mol CO 2 /mol amine for monoethanolamine, MEA). Amines have some drawbacks like a high corrosion rate at high concentrations, the outlet purified gas contains a high-water amount, the energy demand for their regeneration is high and they suffer from high evaporation losses. [10] Indeed, the reverse chemical reaction requires considerable activation energy that is commonly supplied by increasing the temperature of the absorbent. When a volatile absorbent is used, it must be either condensed from the purified gas stream or replenished with the consequent rise of operative costs. Therefore, improvement of the absorption medium, e.g., decreasing the volatility without losing the high loading of the absorbent phase is the primary research interest in physical and chemical absorption technologies.Since the 1990s, low-melting salts have gained increasing interest for application as alternative absorbents in a wide field of chemical processes. For salts with melting points below 100 °C, the term ionic liquid (IL) has been coined. As ILs are built up from an organic cation and an inorganic or organic anion, there is a vast variety of possible structures. Over the last years, a plethora of ILs and their mixtures have been Solutions of biobased ionic liquids (ILs) for recovering CO 2 from industrial flue gas are investigated. Four CO 2 task-specific choline-based amino acids ([Cho][AA]): Alanine, Glycine, and, for the first time, Proline and Serine are tested. The drawbacks related to the high viscosity of these ILs are limited by applying dimethyl sulfoxide (DMSO) as a solvent, which is chosen because it is a polar aprotic liquid with a low toxicity, low vapor pressure, and relatively low price. The choline-based...

show abstract

Section: Methodsmentioning

confidence: 99%

Enhanced CO₂ Absorption in Organic Solutions of Biobased Ionic Liquids

Davarpanah

Hernández

Latini

et al. 2019

Advanced Sustainable Systems

View full text Add to dashboard Cite

show abstract

“…SO 2 can also modify the capacity of CO 2 absorption in ionic liquids since recent research has shown that large amounts of SO 2 can be dissolved in ionic liquids reversibly, which is interesting when aiming at eliminating this component from gas streams but it may compete with CO 2 when the latter is the target compound [20,21,61]. Some values of CO 2 [55]; 0.32-0.72 mol-CO 2 /mol-IL for some amino acid-anion based ILs and 0.1-1.26 mol-CO 2 /mol-IL for other aminate ILs [49]. In addition, mixing ionic liquids with amines could result in lower vapor pressure in comparison with the only use of the amine and, a reduction of the heat of vaporization in the regeneration step.…”

Section: Alternative Solvents For Co 2 Capturementioning

confidence: 98%

Use of monoethanolamine (MEA) for CO 2 capture in a global scenario: Consequences and alternatives

2016

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: CO 2 absorption MEA Amines Global demand Alternative solvents Alternative technologiesRecent research on CO 2 capture is focusing on the optimization of CO 2 absorption using amines (mainly monoethanolamine-MEA) in order to minimize the energy consumption of this very energy-intensive process and improve the absorption efficiency. Process optimization is always required and this research is worth and necessary. However, the main concern arises when thinking of the overall process: solvent production, solvent use and regeneration, and environmental effects related to its use/emissions. The production of MEA from ammonia involves important CO 2 emissions during the Haber-Bosch process. The regeneration of the solvent after the absorption is also an indirect source of CO 2 related to the use of fuels (i.e., combustion processes for energy supply). Thus, the evaluation of the overall balance of CO 2 emitted and captured is essential to determine the efficiency of the process. In addition, other environmental impacts associated to the toxicity and environmental fate of the solvent have to be considered. The use of MEA and other amines in CO 2 capture is a point of concern and a global application does not seem to be the best strategy. This review aims at giving an overview of the main implications of using MEA as absorption solvent for CO 2 capture together with the last advances in research to improve the conventional absorption process. Furthermore, alternatives of using other solvents and/or using other technology and their advantages and weak points will be briefly provided. An approach oriented to produce CO 2 -based products with economic value that can be reintegrated in a closed carbon loop, reducing the use of fresh materials and decreasing the production cost, should be the final objective of current research on CO 2 capture.

show abstract

“…Typical concentration levels range between 12% and 14% for coal-fired boilers and integrated gasification combined cycles (IGCC), 11-13% for oil-fired boilers, 3-4% for gas turbines, and 7-10% for natural gas fired boilers [2]. It has been widely shown that cost-effective mitigation of CO 2 emissions from these electricity-generating sources can be accomplished by carbon capture and storage (CCS) [3][4][5][6][7][8][9][10] The separation of CO 2 from post-combustion flue gas can be conducted by various approaches, including physical/chemical absorption [11][12][13][14][15][16][17][18][19][20][21], adsorption [22][23][24][25][26][27][28][29][30][31], membrane separation [32][33][34][35][36][37][38][39][40][41][42][43][44], and cryogenic distillation [45][46][47]…”

Section: Introductionmentioning

confidence: 99%